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

[WeeMaan]

What is considered as max "safe" 24/7 voltage for 5870?
Cooling is not an issue, 34c in furmark at 1,2v 1ghz.

Is 1,35v okay? Perhaps even 1,4v?

[Zeus]

There's no such thing as a safe voltage other than stock voltage. Go as high as you dare or as high as you think temps are ok.

For 24/7 usage i would just use stock voltage, only for benching i'd go higher. As high as my cooling can take and as long as there is still scaling with voltage.

[Mungri]

I think up to 1.35v is fine as long as the temperatures dont go to high, and since overclocking software supports up to that voltage.

The gains over 1 Ghz arent usually worth the extra required voltage, eg my cards manage 1000 Mhz @ 1.225v, but to get up to 1050 Mhz artifact free, I need to push the voltage to over 1.3v and keep the temperatures under 75 degrees.

I would only go higher for benchmark runs, but for 24/7 use, stick to around 1.2v and 1000 Mhz. I suggest keeping the temperature below 85 degrees.

[kasper93]

My new bench 5870@1055/1320
http://www.imagebanana.com/img/q56424ho/VP1055.1320.jpg

[zalbard]

Is 1,35v okay? Perhaps even 1,4v?

Yeah, pretty sure it is fine. Just watch the temps!

[Zeus]

I've just put an EK fullcoverblock (nickel/acetal) on both my 5870's and temps are fantastic! One card idles at 27ºC, the other one at 29ºC. A full run of 3d mark 06 only heats them up to 31-32ºC! VRM temps are also very good.

I was able to do 3d mark06 at 1020MHz w/1.237V. Me happy? H3ll yeah!

[vinister]

hmmm I just installed the same block.

here's where I'm at... this is a xfx 5850 XXX edition.

Any idea why my VRM temps would be so high? Also the GPU is getting up there at 53C. Maybe I didnt tighten the block down hard enough.

Are you using the thermal pads and the standoffs? I read in the EK thread that VRM temps should be better running without the pads.

[merkk1]

Hi guys
I'am having trouble with Afterburner and vista-64 bit. After i edit the file that enableenofficialoverclocking from 0 to a 1 .Then try to do a over clock in afterburner it crash my pc every time . Got any ideas ? or i'am just a dum ass.

[ceogar]

Hi guys
I'am having trouble with Afterburner and vista-64 bit. After i edit the file that enableenofficialoverclocking from 0 to a 1 .Then try to do a over clock in afterburner it crash my pc every time . Got any ideas ? or i'am just a dum ass.

I got that and after some googling i found a solution. Right click the msi afterburner.exe and choose it to run as "Windows Xp SP 3" compatibility. Solved it for me.

However that dident solve my problem :p The thing is i have the well known flickering-when-more-than-one-screen and i tried to solve this by modifiying my asus bios and lower powerplay and standard clock to 550 / 900 ( I get some minor flickering when i leave standard clock at 725 / 1000 ) But when i do this my maximum overclocking capability decreases to 825 instead of 1090. Tried reflashing serveral times but i cant seem to find a solution to this. Any tips?

( I use the Unlocked Asus bios as base. Dont know if it matters but i have two 5850 in crossfire. )

[HelixPC]

both my 5870's are sitting at 1GHZ core, 1.3GHZ mem with 1.250 volts.

[Zeus]

I've just put an EK fullcoverblock (nickel/acetal) on both my 5870's and temps are fantastic! One card idles at 27ºC, the other one at 29ºC. A full run of 3d mark 06 only heats them up to 31-32ºC! VRM temps are also very good.

I was able to do 3d mark06 at 1020MHz w/1.237V. Me happy? H3ll yeah!

Talk is cheap:





Sorry for crappy image quality.

[alyns]

Ati 5850 + i5 Vantage

[Dahmer]

Current power supply : Corsair 620HX
New power supply coming : Corsair 750HX (going to use an 8800GT for physx)

update for me :
new power supply fixed my problems

cpu stable again at 4 GHz with acceptable voltage too, passed 4 linx runs with all my ram and i stopped it there, took long enough and thought it was good enough, previous power supply wouldn't even get me through windows login with the same voltages, +0.1 bluescreened during first pass with high temperatures so i gave up there

finished vantage now with settings i'll use 24/7, will do a run again later to see just how high the card can go at 100% fanspeed

[ZL1Killa]

figured out my problem on bad company 2.

Had to raise IOH, IOH/ICH , ICH up several settings. This applied to me as i'm running crossfire and read that it helps greatly to prevent BSOD from video driver/card. It also tends to improve performance. I read this in one of the i7 overclocking guides

everything works fine now

[JohnJohn]

Talk is cheap:

....

Gorgeous rig dude!! Really neat.. congrats

[Zeus]

Thanks.

[dejanh]

Quick run this morning. Not too shabby. I need to squeeze out the additional ~60 pts or so for 21K on GPU alone.

Vantage (P) setting...



And an 06 run from this morning...

[Dahmer]

installed 10.3 and bumped up core & ram a bit higher, i'm stopping here, temperatures are going too high for my liking and i want to keep the card in one piece for now



*UPDATE*

Added my "old" 8800GT as physx

[demowhc]

Hi guys
I'am having trouble with Afterburner and vista-64 bit. After i edit the file that enableenofficialoverclocking from 0 to a 1 .Then try to do a over clock in afterburner it crash my pc every time . Got any ideas ? or i'am just a dum ass.

I had this problem and had to disable ULPS (the new powerplay feature for crossfire in the newer drivers - 10.2+) this just makes the second card go to sleep in 2D mode to 0mhz instead of the normal 2D clocks.

instructions here - http://www.xtremesystems.org/forums/...&postcount=100

[K404]

Cooling: Dice
voltage: 1.38v


Will add water numbers in the next day or so... those are a bit more useful to more people....

Im looking at ~ 1080MHz @ 1.25v

[Dahaka]

Cooling: Dice
voltage: 1.38v


Will add water numbers in the next day or so... those are a bit more useful to more people....

Im looking at ~ 1080MHz @ 1.25v

Nice.

Witch vmods do you use on that session?.

[zalbard]

@ K404:
Really nice!
I'd be curious about the mods also!

[K404]

Hey Thanks!

Just a simple vCore hardmod. Couple pics in the Xtreme3D section.

Will be a couple days before I can get water numbers. Benching again tomorrow, so everythings set up for that

[nickless]

With Cat 10.3 under water:
W3520@4600, HD5850@1086/1285 (XFX 5870 bios), Win7 x64 without tweaks.
22473:

[Mech0z]

This is my most stable clock, havent really tinkered with memory, might get a few more MHz which increases score, but 1343 got higher score than 1350 so I just used that

Havent tried more than 1.35 as thats what MSI Afterburner allows and I cant push Core past 1045 so I need more juice temps not high anyway wiht 100% fanspeed and extra fan at exaust and intake.

Do I need another bios to get more than 1.35 from MSI afterburner?

1045
1343
P Vantage = 23096 (Top 100 Hurray)
P Vantage GPU = 21807

http://hwbot.org/community/submissio...70_23096_marks