*** Official Radeon HD5800 Series Overclocking Thread ***

Here's my personal best so far with my 5870. I haven't hit a wall yet on core or memory so I will keep pushing. I am currently running a stock card with stock bios and stock cooling.

XFX 5870 1GB XXX Edition - Stock Cooling
Core i7 920 Batch #3913A330 - Water Cooled
P6T Deluxe V2 ~ Bios 0006
Kingston HyperX 2000Mhz CL8 3x2GB Elpida Hyper
Corsair TX850 PSU

I am only using MSI Afterburner for both voltage adjustment and overclocking.

Will keeping pushing. Looking to get a nice full cover block for this card once I max out my clocks on air. A nice cpu with a higher multi would be nice as well. This Board has a bclk wall around 218.

http://i580.photobucket.com/albums/s...RK05_36389.jpg

http://i580.photobucket.com/albums/s...RK06_28512.jpg

http://i580.photobucket.com/albums/s...age_p22377.jpg

http://game.amd.com/us-en/drivers_ca...indows-7-64bit

Quote:

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Originally Posted by Andrea deluxe

http://game.amd.com/us-en/drivers_ca...indows-7-64bit

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Catalyst 10.1 is out - downloading, thanks! :D

I can overlock my card 10Mhz+ with these drivers!
Why? I can't explain!

strangely for me it wont let me do some 1115core vantage run with new catalyst driver. But i might go try out furmakr to see my best 24/7 max clock

I haven't pushed it really hard yet, but, here are my preliminary results.

I just got the card yesterday. It's an XFX, vanilla, 5870, on air until my ek blocks come for it. I say blocks because my second card comes tomorrow.

Here's at 950-1250. I flashed to the Asus bios and I am running cat 10.1 drivers.

http://service.futuremark.com/compare?3dmv=1834418

http://i213.photobucket.com/albums/c...ntagescore.png

http://i213.photobucket.com/albums/c...pu950-1250.png

Nickless you rock .. awesome score you got and thanks for the tips in a week or so , il post my attemps using asus bios :D

Got my second 5870 and put it under water tonight... Preliminary results:

This is at 1100 1310 @ 1.337v

http://service.futuremark.com/compare?3dmv=1839999

http://i213.photobucket.com/albums/c...agescore-1.png

http://service.futuremark.com/compare?3dm06=13084384

http://i213.photobucket.com/albums/c...302083dm06.png

Leet voltage?

Quote:

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Originally Posted by nkresho

Got my second 5870 and put it under water tonight... Preliminary results:

This is at 1100 1310 @ 1.337v

http://service.futuremark.com/compare?3dmv=1839999

http://i213.photobucket.com/albums/c...agescore-1.png

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Great 5870 clocks and CF score!
Would you please run all of the 3dmarks with a single card at 1100mhz core and post them on HWBot? That'd be awesome! :yepp:

L33T voltage! Smartdoctor might give you a little more vcore ;) AND, if you know how to edit your bios, the newest RBE beta supports writing the second vt1165MF's registers to increase memory voltage as well (5870,5970)

Thanks guys.

I did notice the elite-ness of my voltage. LOL.

I'll do single card on hwbot. Just give me a couple days. I just can't bear to tear it all apart right after getting the loop together. I got both (06+vantage) my dual card scores on there.

validation
heaven scores
3.8GHz 3 cores, 5850 725/1000
http://www.overclock.net/attachment....1&d=1264908870
3.8GHz 3 cores, 5850 1000/1200
http://www.overclock.net/attachment....1&d=1264908870

Strange stuff. I can't seem to adjust vcore anymore now that I'm on 10.1. The option is grayed out in Afterburner.

Anyhow, if I don't touch the voltage I'm apparently stable to at least 800/1150 on this 5850. My previous results of crashing instantly at 850 using even 1.25V seem odd now. Any ideas what might be going wacky? I'm also miffed why I can't get to at least 1250 memory at default voltage when that's the stock rating for these memory chips. Are they fed less voltage than whatever they're rated at by default?

This thread has been very helpful. I'm a noob at OC on vidcards. I've never flashed a bios, or done anything aside from running the auto tune in the ATI overdirve software. I have a saphire 5850 and I've downloaded MSI afterburner. Could you guys recommend a solid oc setting for my card? Currently it's set to 725 core and 1000 mem. I guess the fastest the current bios will let me set it is 775 core 1125 mem? I plan to utilize the stock cooler.

Flashing the bios scares the crap out of me. :eek: I've never done it before. I need to look for a good walk through on it. Any information would be helpful cuz i'm clueless...:shrug: Thanks.

Quote:

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Originally Posted by Frogeye

Flashing the bios scares the crap out of me. :eek: I've never done it before. I need to look for a good walk through on it. Any information would be helpful cuz i'm clueless...:shrug: Thanks.

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http://www.techpowerup.com/articles/...g/vidcard/34/1 :up:

too lazy for screenshots right now but..
http://service.futuremark.com/compare?3dmv=1853691

5850 at 1000/1250 and 1312 core voltage
cpu reports as 3.6GHz but its really at 3.2... for some reason it wont accept anything less than max multiplier in vantage... oh well.


*edit*
so apparently Modern Warfare 2 was more of a challenge than Vantage was... had zero issues in Vantage but MW2 locked up as if there wasnt enough volts as it did in vantage before i jacked up the volts... already pushing 1.3+ into it.

Quote:

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Originally Posted by zalbard

http://www.techpowerup.com/articles/...g/vidcard/34/1 :up:

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That link really helped. I'll have to set up a USB stick. Do you have a bios file you could reccomen for my 5850?

Quote:

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Originally Posted by Frogeye

That link really helped. I'll have to set up a USB stick. Do you have a bios file you could reccomen for my 5850?

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http://www.xtremesystems.org/forums/...5&d=1257556756 this should be an unlocked one (see OP).

any tool to flash bios under Win7 64bit?

Flashing under Windows is not recommended.

Hey guys, I need some help.

I recently bought a 1080p monitor, and as nice as it is, my 4850 really struggles with every game I put at it, except for CSS or TF2. Now my questions..

1) Will a 5850/5870 bottleneck my E8400 4250Mhz?
2) Would it be worth upgrading to an i7 920 ontop of that, and ocing that to 4.0 GHZ...will that give me a decent FPS boost when paired with a 5850/5870 when compared my current overclocked CPU? What I mean is

E8400 4.25 ghz + 5850/5870
Versus
i7 920 4.0 ghz + 5850/5870 = How much more of a boost?

3) I hear you can OC a 5850 to 5870 speeds, so would it be better just to buy a 5850 and OC it to kind of get near 5870 speeds?
4) How about 5870 overclocking? Would it be worth more to buy that for 100 bucks more and oc that instead?

Thanks.

No point to go i7 imo, you can try and push your CPU a bit higher, though, and that'll be plenty.

@dark-energy: is that 4850 512mb version? what are these "other" games? and are you trying to run at ultra high settings and ultra AA settings? imo no point investing in i7. and 5850 oc to 5870 speeds pretty easily... though i think it's the extra vram gonna make you feel a playable difference.

@frogeye: just use atiflash and save your original bios, mod it with RBE v1.24, save new one, flash card(s).

my question: i've seen some people with ridiculous high mem clocks like >1300. is that reasonable to expect? on my cards i'm thinking it's the mem clocks that it's not liking. i've bumped core volts up and i can get core up to 950 at 1.2v (could probably go lower volts) but the mem doesn't seem to like going above 1225ish before crapping out.

edit: i have 5850.

10.x driver....

http://www.station-drivers.com/page/ati%20catalyst.htm

Quote:

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Originally Posted by Dark-Energy

1) Will a 5850/5870 bottleneck my E8400 4250Mhz?
2) Would it be worth upgrading to an i7 920 ontop of that, and ocing that to 4.0 GHZ...will that give me a decent FPS boost when paired with a 5850/5870 when compared my current overclocked CPU? What I mean is

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E8.4k will bottleneck 5xxx series cards - ive got a set up like that.

Like ppls say no point going for iX CPU's - better buy something like Q9XXX - im planing buy one and OC it.

My ASUS 5850 runs at 1050/5000 1.3V so there still planty room.

Quote:

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Originally Posted by darckhart

my question: i've seen some people with ridiculous high mem clocks like >1300. is that reasonable to expect? on my cards i'm thinking it's the mem clocks that it's not liking. i've bumped core volts up and i can get core up to 950 at 1.2v (could probably go lower volts) but the mem doesn't seem to like going above 1225ish before crapping out.

edit: i have 5850.

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I think 5850 & 5870 will do average 1240-1325mzh memory max (samsung ics). 5700 & 5970 can do 1300-1450mhz memory (hynix)

Quote:

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Originally Posted by playground

E8.4k will bottleneck 5xxx series cards - ive got a set up like that.

Like ppls say no point going for iX CPU's - better buy something like Q9XXX - im planing buy one and OC it.

My ASUS 5850 runs at 1050/5000 1.3V so there still planty room.

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Yeah, an E8400 at stock will.

But mine is clocked up all the way to 4400 mhz, I don't think it will bottleneck. But I asked anyways to see what other people think.

Just played Crysis Warhead for 20 minutes @ 950/1300 with the stock cooler at the stock fan speed at stock volts. Seems to clock quite nicely, way better than my other POS 5870 which needs 1.2v to be stable at stock clocks (LOL!). I didn't want to be without a working computer, so I ordered another one :p Once the faulty 5870 comes back from RMA I'll run them in crossfire :D Will see if I can get it 1000/1300 game stable tomorrow. Wish me luck!

Try Q9550 @ 4.5 GH




http://i48.tinypic.com/2i6nq4k.jpg

i thought that the 5850 and 5870 chips were rated for 1250MHz, i just immediately set mine to 1250 since i was told that was their rating and assumed it was right... looks like i'll back it down to 1200 or 1150 to see...

Quote:

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Originally Posted by Particle

Strange stuff. I can't seem to adjust vcore anymore now that I'm on 10.1. The option is grayed out in Afterburner.

Anyhow, if I don't touch the voltage I'm apparently stable to at least 800/1150 on this 5850. My previous results of crashing instantly at 850 using even 1.25V seem odd now. Any ideas what might be going wacky? I'm also miffed why I can't get to at least 1250 memory at default voltage when that's the stock rating for these memory chips. Are they fed less voltage than whatever they're rated at by default?

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i also have this problem flashed with the asus bios and cant adjust voltage its greyed out also

had to use asus smartdoctor to change me voltage
got it running at 1010mhz gpu 1300mhz mem at 1.25volts on stock cooling
got ek full block coming so will test higher clocks when thats fitted

one strange problem im getting i have an onkyo nr906 connected via hdmi for my sound but when i turn it on as extended desktop with any clock over stock i get graphic glitches on me desktop and games when i turn the amp back off it stops
must be a driver issue

Quote:

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Originally Posted by IN7OX

i also have this problem flashed with the asus bios and cant adjust voltage its greyed out also

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just edit the voltages in rbe... no reason to mess around with 3rd party apps then...:up:

is there a guide for using rbe looks a bit complicated

Quote:

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Originally Posted by purecain

just edit the voltages in rbe... no reason to mess around with 3rd party apps then...:up:

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Does that actually work? As in, if I set the voltage higher in RBE than 1.0875V it'll actually work at that higher voltage? I wasn't sure where the limiter lies.

From what I know, for 5850's the voltage editing does work, but you absolutelly should not edit the voltages in "Clock info XX" columns. Use the "GPU registers" button and only edit voltages there. And I am not sure if 5700's are supported at all.

iirc you can set any voltage, theres a thread about it on here in this section...i'm still abroad and havnt used the latest version yet, i expect its just the same procedure as in previous versions. save your bios, open it in rbe, edit voltage registers and set clocks and overdrive limits+fan control... save and flash....

good luck particle...

Quote:

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Originally Posted by darckhart

@frogeye: just use atiflash and save your original bios, mod it with RBE v1.24, save new one, flash card(s).
edit: i have 5850.

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is RBE done in Windows7 or do I load that on my USB boot drive? OK I see this is done in WIN7 now.

Also, will RBE let me make a copy of my original bios?

I've got a copy of the bios file that Zalbard posted for me http://www.xtremesystems.org/forums/...5&d=1257556756

I tried to create a USB bootable stick using and put the Atiflash program along with the above mentioned bios file that Zalbard pointed me to.

I want to get a copy of the bios that is on my card but I'm clueless as to how to go about that.

I have not tried anything yet... Not sure what I'm doing. TY
:shrug:

Quote:

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Originally Posted by Frogeye

I want to get a copy of the bios that is on my card but I'm clueless as to how to go about that.

I have not tried anything yet... Not sure what I'm doing. TY
:shrug:

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Try this. Use it for saving only, though, not for flashing.

Ahh screw this! I'm such a noob I can't even make a usb dos boot. I've tried. Thanks for the suggestions.

The one I made says "no dpmi memory" when I try to run ATIFLASH from dos. It's a win98 dos boot. Epic fail

q 9550 @ 4.5 GH + 5870 @ 1025/1350


http://i46.tinypic.com/1zv4faa.jpg

Quote:

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Originally Posted by Frogeye

Ahh screw this! I'm such a noob I can't even make a usb dos boot. I've tried. Thanks for the suggestions.

The one I made says "no dpmi memory" when I try to run ATIFLASH from dos. It's a win98 dos boot. Epic fail

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You can make a CD or DVD image much easier if your optical disk drive is NOT SATA.

Quote:

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Originally Posted by zalbard

You can make a CD or DVD image much easier if your optical disk drive is NOT SATA.

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I'll look into the DVD sollution :)

Quote:

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Originally Posted by Frogeye

I'll look into the DVD sollution :)

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http://www.bootdisk.com/bootdisk.htm
Grab a DOS 6.22 image, add your flashing stuff to it and you're set. :up:

http://img7.imageshack.us/img7/9030/screenshotvb.jpg

http://service.futuremark.com/compare?3dmv=1815358

There don't appear to be any clear instructions on how to do it. I tried changing the main voltage register to 1.2V and then changed all the XX registers to 1.2V as well. It crashes instantly when it goes into 3D mode. How are you guys getting overvoltage to register correctly?

Quote:

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Originally Posted by zalbard

http://www.bootdisk.com/bootdisk.htm
Grab a DOS 6.22 image, add your flashing stuff to it and you're set. :up:

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Ok zalbard I somehow figured out how to do the usb boot and have everthing on the stick. I was even able to save the stock bin file to the stick.

When I tried to flash I got the ssid mismatch error when I typed:

atiflash -p 0 newbios.bin

I googled the error and I guess I need to try to use -p 1 ? Baby steps! :with:

you need to add -f to force the flash.... atiflash -f -p 0 newbios.bin

Quote:

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Originally Posted by purecain

you need to add -f to force the flash.... atiflash -f -p 0 newbios.bin

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I'll try that thanks.

Yeah! I did it. Kind of freaked me out when it booted up after the flash for the first time. I didn't realize I'd have to reinstall the vid drivers again.

I used atiflash -f -p 0

Ty you guys.

http://farm5.static.flickr.com/4011/...7a607506_b.jpg

Update score !!

http://i48.tinypic.com/2dgorbt.jpg

I just got two Asus 5850’s a couple of weeks ago from Newegg, the default settings are 850/1200 and the BIOS appears to be the same version as the 5870 according to GPU-Z. Also Asus Smart doctor doesn’t recognize the cards which may indicate they have the 5870 BIOS. Has anyone else seen this with new out of the box cards?

http://img.techpowerup.org/100213/Capture113040.jpg

http://img.techpowerup.org/100213/Capture038.jpg

What is a safe temperature for both the VDDCs and the GPU? I'm running my 5850 stock 725 core 1000 mhz mem. But for gaming, I'll turn it up to 870 core 1080 mem with @ max voltage of 1.1000

This was FURMARK TEMPS
The gpu maxed out @ 83c
vddc1 max 92c
vddc2 max 94c
vddc3 max 91c
Furmark stability test is hardcore!

In Game BFBC2 1680X1050 graphics on high settings
GPU max 41c

vddc1 max 39c
vddc2 max 39c
vddc3 max 39c

I would imagine that I could OC some more for games.

I've found that 850 core and 1140mem is very game stable at 1.1v and temps are good at 51c

ive got prob with Smart Doctor. Everytime after i restart system it sets V to 1.6v - 1.5v - any idea how to fix it?

I found on ASUS support site drivers for 5850 - if im gone install these r thay gone replace ATi drivers or its just some kind od addon. Any1 tryed tham?

I'd like to revisit using RBE to modify core voltages. Do you edit register 0x17 and then use the number you put in there as well for the core state voltages? Alternatively, do I leave the core state voltages clear or use the value corresponding to the default voltage of that register, etc? When I tried modifying the voltage on my 5850, it didn't work.

Quote:

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Originally Posted by playground

ive got prob with Smart Doctor. Everytime after i restart system it sets V to 1.6v - 1.5v - any idea how to fix it?

I found on ASUS support site drivers for 5850 - if im gone install these r thay gone replace ATi drivers or its just some kind od addon. Any1 tryed tham?

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Don't use that.
Use MSI Afterburner instead.

@ Frogeye: ramp up the fan for furmark, can leave it on auto when gaming, and push the card higher.

@ Particle: you need to change the register value only I think. Link.

Success. I left the voltages alone in the GPU xx table and then just changed all four registers to 1.2V since I don't care what "state" it is in (I want it locked to 3D clocks at all times).

Quote:

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Originally Posted by zalbard

@ Frogeye: ramp up the fan for furmark, can leave it on auto when gaming, and push the card higher.

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Still testing but I've got the card two hours stable gaming @
940core 1140mem 1.225 volts. For some reason it froze up after about two hours. Temps stayed below 60c on gpu and vddcs.

Today I'm going to go with 930/1100 and that should be that. :up: Unless you think I could try something different.

Regardless the card rips it up at this OC. TY!

So far so good at 900/1150 using 1.2V. :up: Hoping for 1000 before all is said and done.

Update .....


http://i45.tinypic.com/307vvp5.jpg

Did some benching yesterday with the computer in front of the Window. Wasn't that cold though. Hopefully we can get some colder weather because I know i can push it farther

Quote:

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Originally Posted by MetalRacer

I just got two Asus 5850’s a couple of weeks ago from Newegg, the default settings are 850/1200 and the BIOS appears to be the same version as the 5870 according to GPU-Z. Also Asus Smart doctor doesn’t recognize the cards which may indicate they have the 5870 BIOS. Has anyone else seen this with new out of the box cards?

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Yeah I got one of these from Newegg and I thought the card was flashed with a 5870 bios and returned so I sent it back. My buddy got one right after and he had the same thing so it looks like they are coming from the factory flashed like that. The second one I got after the rma was normal 725 clock.

from reading all the writeups...it keeps talking about *.rom .... the asus unlocked bios I downloaded is a *.bin file. Is this still ok to flash? or do I need to do something to get a *.rom file?

ok, nevermind. flashed & done. .bin works


When I got booted back into windows & started to install 10.2 driver, it blue screened on me and dumped (need to turn that off, lol) then I got it back up ok. tried to install again after making sure to uninstall whatever did get installed. It then said the driver wasn't installed right. So I double checked the uninstall, rebooted and then Installed it finally.

it worked & is working now with 10.2 drivers

Is anyone having issues oc'ing with MSI Afterburner in Crossfire after cat 10.2?

When I apply clocks it just hangs when CF is enabled, but works fine with CF disabled... I think it may have to do with the new powerplay settings in 10.2 and newer??

Any particular brand that seems to be doing better, have a choice between Sapphire and MSI, which one would you choose?

Both have the same warranty and MSI will be easier to RMA as I know the guys here. Asus is out, as the prices are about 20-25% higher for no reason.

Get MSI then.
No brand is doing better than others.

I got my asus 5870 for the same price has all the other reference boards! Tekheads sell them cheaper than normal if your in the uk!

what program are you guys using to overclock the 5870's? CCC? Been outta the ati game, is atitool still around? I have the ASUS version with voltage tweak, but i have to install their card driver to use the Asus Smart Doctor, and they dont have the new 10.2 yet.

MSI Afterburner all the way! :up:

My 5870 does GDDR5 5600MHz :eek: on Stock Voltage, i'm testing...

Quote:

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Originally Posted by 8800's@over

My 5870 does GDDR5 5600MHz :eek: on Stock Voltage, i'm testing...

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nice clock 4 memory, it's mean 1400 mhz

Thanks man...could not get any of them...so got a sapphire instead...does 930/1150 on stock voltage....what seems to be the average voltage jump for 1000 Mhz core...I just used RBE to up the OC values in CCC and used it..

Using upto 1.3v using MSI software did not help at all...could it be that the voltage is locked? Which is the best bios to use now.

Also has anyone changed the TIM on these things...any reason to do so?

Quote:

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Originally Posted by mav2000

Thanks man...could not get any of them...so got a sapphire instead...does 930/1150 on stock voltage....what seems to be the average voltage jump for 1000 Mhz core...I just used RBE to up the OC values in CCC and used it..

Using upto 1.3v using MSI software did not help at all...could it be that the voltage is locked? Which is the best bios to use now.

Also has anyone changed the TIM on these things...any reason to do so?

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from what I hear the newer revision Sapphire 5800 cards have no voltage adjustment, but if you can access the voltage slider in AB chances are it's the older revision. The ones that I've tested that were the second spin, AB blacked out the slider.

Quote:

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Originally Posted by mav2000

Using upto 1.3v using MSI software did not help at all...could it be that the voltage is locked? Which is the best bios to use now.

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What Load temperatures are you getting , my HD5870 tends to give errors when Load temps go over 75C @ 1GHZ Core

i have a xfx5870xt should i flash for better oc and with what bios now max 1060/1350 on stock cooling?

I've got a Visiontek 5850 I just bought to replace my 4870x2. So far I've loved the thing. However, I'm not as satisfied with its overclock as I could be. I get 960/1250 stable at 1.27V in all games and benchmarks, but at 1000 core no matter what voltage (up to 1.35) my card is unstable in L4D. I can run Vantage, heaven, furmark, but anything around 1050 is unstable even with stock memory and voltage set to 1.35.

It seems like I've just got a weak GPU, with 1.27 volts max gpu core is 960 whereas I see others doing 1050 at 1.27. I'm thinking about flashing another bios on the card and seeing if there is a difference in what I can max out.

I also find it odd that I can get L4D to crash my 5850 when no other game/benchmark I run ( I played bfbc2, supreme commander 2, anno 1404, dirt 2) each for about 2 hours and never had a crash at 1000. Yet 1000 on L4D crashes with artifacts after about 8min. I noticed someone else on XS said the same thing about their 5850 and L4D2.

Anyone find a bios flash helped?

I doubt a new BIOS would help.

Nice charts.I am sitting on 875/1150 on 1.1v, but what the chart needs is a Brand column. See which cards get what. Mine is an XFX 5850 non XXX

okay, that is a lot of pages to read through...
- how do you guys get CCC to increase the maximums of the sliders in overdrive? mine is maxed at 775/1125... i saw in the original post that if you dont want to use atitool (which i do not) you need to flash... so is it just MSI owners that get the 1500 max?
- does increasing the GPU voltage increase the VRM temps? my liquid-cooled gpu runs very cool, but the vrms already get hotter than i would like them to.

Sweetness!

http://www.techpowerup.com/gpuz/28ar9/

http://i47.tinypic.com/rcj6o4.gif

http://i47.tinypic.com/mr8sxk.jpg

All on air baby.

VDDCs 38*C under load on air? how is this even possible?

fan at 100% speed really help alot for vrm temps

Quote:

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Originally Posted by AndrewZorn

VDDCs 38*C under load on air? how is this even possible?

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Look at fan speed... that and open window with cool winter air. :up:

Anyway, I used Furmark to test that setting further and it locked up in about a minute. I checked the VDDC current and it shot up to 68Amps which was like double what I've ever observed from any HD 5870 during operation. Either Furmark is one hella crazy program or GPU-Z ain't reading that right.

Quote:

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Originally Posted by Intratech

Look at fan speed... that and open window with cool winter air. :up:

Anyway, I used Furmark to test that setting further and it locked up in about a minute. I checked the VDDC current and it shot up to 68Amps which was like double what I've ever observed from any HD 5870 during operation. Either Furmark is one hella crazy program or GPU-Z ain't reading that right.

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It's Furmark, it just canes the crap out of the vid card. Personally I never use it for more than 1 minute, just use it to see the volts and VDDC Phase temps briefly and thats it.

Quote:

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Originally Posted by Intratech

Look at fan speed... that and open window with cool winter air. :up:

Anyway, I used Furmark to test that setting further and it locked up in about a minute. I checked the VDDC current and it shot up to 68Amps which was like double what I've ever observed from any HD 5870 during operation. Either Furmark is one hella crazy program or GPU-Z ain't reading that right.

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Wow! great clocks. you were able to get that using only 1.16 volts? I'm using 1.18 for stable gaming 900/1140. I haven't really pushed to see if it will do 1k stable.

Thanks. :D

Yes, look at the screenshot for the GPU load and the time it was running.. it was at default voltage. It was stable for everything else apart from Furmark which caused a lockup in about a minute. Someone told me not to use Furmark to test for stability so I'm going to loop 3dmark05 or 06 next time.

Has anyone noticed that more voltage actually had a significantly detrimental effect on their overclock of HD 5850? For example...

1.125V/900/1250 - stable
1.137V/900/1250 - slight artifacting
1.149V/900/1250 - significant artifacting but then...

1.187V/975/1250 - no artifacting, stable

It's like the voltage has to scale with clock speed, i.e., pumping even slightly more volts at certain clock actually has a negative effect and makes the card more unstable. This is not a one off thing, I can pretty much produce it at will.

I might test out that theory with the Asus HD 5870 actually. Something similar was puzzling me about it, at times it was stable at a certain clock but at other times it would just artifact like mad so maybe the vGPU I was using might be causing it. I'll check that out over the weekend.

Quote:

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Originally Posted by Intratech

I might test out that theory with the Asus HD 5870 actually. Something similar was puzzling me about it, at times it was stable at a certain clock but at other times it would just artifact like mad so maybe the vGPU I was using might be causing it. I'll check that out over the weekend.

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Yeah, it would definitely be interesting to know. I know that 5870 vs 5850 is a bit of an apples to oranges, maybe more like granny smith to red delicious :p:

Anyway, I'm pretty sure this is not a fluke but a lot of people don't look at this kind of stuff. It is puzzling though as it definitely behaves as though voltage scales with core clock and more volts is certainly not always better despite the cooling. It's like the cards have certain voltage "sweet spots" for a given clock. I'm still waiting on my second HD 5850 to test this theory out on as well.

Quote:

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Originally Posted by dejanh

Yeah, it would definitely be interesting to know. I know that 5870 vs 5850 is a bit of an apples to oranges, maybe more like granny smith to red delicious :p:

Anyway, I'm pretty sure this is not a fluke but a lot of people don't look at this kind of stuff. It is puzzling though as it definitely behaves as though voltage scales with core clock and more volts is certainly not always better despite the cooling. It's like the cards have certain voltage "sweet spots" for a given clock. I'm still waiting on my second HD 5850 to test this theory out on as well.

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That'd be perfect for just about every overclocker with a 5850 that isn't satisfied with his clock speeds. However I am pretty skeptical of it. I guess there could be some interference except at certain voltages, but that's far stretched I think. I'm going to test this idea with my visiontek 5850.

I've been hoping for 1050/1300 stable but I can only manage 960/1250, not a big difference but still.

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Originally Posted by GregUMR

That'd be perfect for just about every overclocker with a 5850 that isn't satisfied with his clock speeds. However I am pretty skeptical of it. I guess there could be some interference except at certain voltages, but that's far stretched I think. I'm going to test this idea with my visiontek 5850.

I've been hoping for 1050/1300 stable but I can only manage 960/1250, not a big difference but still.

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:confused: Not sure how this would be perfect for people overclocking... :shrug:

Anyway, I did some more tests and definitely my card behaves this way. I tested 1000MHz core at 1.225V and then at 1.237V and while there were no artifacts at 1.225V at 1.237V the artifacts started within the first 2 minutes of test. Then I increased the core frequency to 1005MHz and I managed to go 10 minutes without artifacts. Then I increased to 1010MHz and I went 20 minutes without artifacts.

So very, very strange. It could be some unbelievably weird coincidence that I keep on hitting every time, but I doubt it. It's not the first time I was able to reproduce this either.

Quote:

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Originally Posted by dejanh

:confused: Not sure how this would be perfect for people overclocking... :shrug:

Anyway, I did some more tests and definitely my card behaves this way. I tested 1000MHz core at 1.225V and then at 1.237V and while there were no artifacts at 1.225V at 1.237V the artifacts started within the first 2 minutes of test. Then I increased the core frequency to 1005MHz and I managed to go 10 minutes without artifacts. Then I increased to 1010MHz and I went 20 minutes without artifacts.

So very, very strange. It could be some unbelievably weird coincidence that I keep on hitting every time, but I doubt it. It's not the first time I was able to reproduce this either.

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you running furmark for your tests?

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Originally Posted by ReverendMaynard

you running furmark for your tests?

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Running Furmark 1.8.0, ATITool 0.27 beta 4, and Kombustor for general stability tests, then Crysis Benchmark, 3DM06 and Vantage for gaming stability. Basically the whole suite. I observed the same type of behavior with each tool.

Edit: I don't necessarily see this as a problem, just as an interesting quirk. I just did ~1h of ATITool with no artifacts at 1.225V and 1000/1250, bump to the voltage and artifacts start right away, bump down and artifact disappear. In Kombustor this instability will show as flickering of the MSI fur generally, sometimes actual blocks will appear.

My new BABY!
http://www.abload.de/thumb/2400029dg.png

Watercooled emert, right?

Yes!
EK Plexi Nickel!
It's a dream though...but more isn't possible!
I don't know why? I gave him 1,4V and 1150 on core sucks! 1410 on mem either!

Yea, it so obvious that you need more gpu power, lol!

Is this a good score with 2 cards... I can't really OC much without it crashing...

http://img25.imageshack.us/img25/8656/5870x2.png

My 5890!
:D:D:D
http://www.abload.de/thumb/graka2252u.png
:D:D:D