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

[Monstru]

Hehe, I will, I will, but first I have to finish my review, and after that I will start working on the overclocking review. I am sure this will look good on 5850 and 5870, just like it did on 4890 at that moment

Regarding FUR....well, at 850 with 1200 everything is ok in Fur and in Warhead and all the other tests, the board is rock stable. But...

with Fur, I can go as high as 875/1300 and everything is ok. However, this fails in 3DMark 2003 right away. 850/1300 fails after a few minutes, 850 with 1200 is rock stable (6 loops of Warhead, 6 long loops of FarCry 2, etc). So yes, Fur is not quite accurate with this cards.

[Zinthar]

This may be a stupid question, but when you soft overvolt these cards, does that voltage only apply to when the card is in 3d mode? That is, will it still idle at the lower stock voltage for 2d?

I'm looking at grabbing a 5850 and giving it the volts necessary to get it to about 900/1200 or so to get 5870-like performance out of it. But if this were to damage the power efficiency of the cards while at idle, then that would hamper the value of performing the overclock.

Also, has anyone reached an early consensus on how well the 5850's OC in comparison to the 5870's? Are they able to handle as much voltage as their larger siblings? I was thinking that unless the power handling or stock cooler on the 5850 substantially hurt its potential, that the GPU should probably have the same average potential as the 5870 since AMD probably just turns any GPU that has issues with 1 or 2 of its sets of shaders into a 5850.

[GLENBOY]

yes if you overvolt your card using asus smart doctor or msi afterburner the overvolt is in 2d and 3d and is still running at the volt unless you change it back using either of the above or you reboot the only way for powerplay to still be working normally is if the overvolt is applied in the bios which atm is not possible as rbe is not ready for that atm but its coming, althought some people are saying the 5850s and 5870s run at same stock volts in 3d after looking at loads of reviews i'm not so sure it seems the 5850s have a slightly lower stock volt i see 1.09 banded about and the the 5870s the volts banded about is 1.16 volt, so i think it'll overclock similar with an overvolt but might just not get just as much due to a bigger pcb on the 5870s and possibly a slightly more powerful cooling system but it'll get close imho

i think whats good with the 5850s is they have 32 rops same as 5870 whereas generally with cut down versions of cards the rops are reduced which really affects performance, but with 5850s they are the same and the disabled shaders imho won't make a big difference if the 5850 is running at same speeds as its big brother


YEH monstru let see some overvolted 100% fan action m8, thanks for posting the info we love it

[Oese]

not true. its only in 3d. at least with msi afterburner..

[GLENBOY]

i stand corrected if thats the case

[Zinthar]

not true. its only in 3d. at least with msi afterburner..

Does MSI Afterburner function with any brand of 5850 or 5870? Or does it require a BIOS change?

[Oese]

y i tested and i'm glad its only for 3d mode

really nice u can adjust the voltage with it, enable "apply oc after bootup" and it will save it in the driver settings and load again each boot without starting msi afterburner or some crap

works with any brand

dammit this card did everything right

[Nizzen]

Overclocking is working in Vantage!

[Oese]

if only someone could post sensors tab open D

on first tab theres no information else then if its 5870 or 5850

[jaredpace]

if only someone could post sensors tab open D

on first tab theres no information else then if its 5870 or 5850

except for 1600 or 1440 SP

Got some Info:

Originally posted by: MrK6
From my BIOS read-out I get 0.95V, 1.063V, and 1.162V. So, my guess is that's your 2D idle, 2D Perf, and 3D Perf respectively. There's a total of 7 clock info modes listed in the BIOS (as opposed to 9 in the 4870). Idle is 157/300, and there's 850/1200 for full speed. There's also three other modes listed - 600/900 @ 1.063V, 400/900 @ 1.063V, and 400/1200 @ 1.063V. If I had to take a stab at guessing which they are, just based on what I know of the card and what I've read, 600/900 is throttling, 400/900 (labeled UVD) is for playback, and 400/1200 is for dual displays.

I don't actually use my computer for any high-def playback (I watch a regular DVD maybe once every two months), so I really can't comment on it's performance. Game-wise, it's amazing. The drivers still need work as I don't think the card is getting as much performance as it should be, but that'll come. I "side-stepped" over from my GTX295, and I have to say there's a marked improvement in gameplay quality, especially with "smoothness" and flow. The overclocking capabilities of such a new chip are also impressive, especially considering the ease of software voltage modification. I'm still tinkering around with voltages and capabilties, but at 950MHz, this card is insane. I imagine better samples that can get to 1000MHz 24/7 with minor voltage adjustments will quite amazing.
The MSI Afterburner program works on all brands, that'd be my guess (a big kudos to MSI).

http://forums.anandtech.com/messagev...=y&STARTPAGE=2

Good news for the 5870
157/300 .95v idle
400/900 .95v/1.063 blu-ray, UVD
400/1200 1.063v 2d multi-display eyefinity
600/900 1.063v OVP/OCP initiate throttle
850/1200 1.162v 3d performance

And, loco just did 1200mhz core / 1250mhz mem on Tri-Fire using 1.375v thru afterburner (LN2 cooled). He says that > 1.375v doesn't give him any higher mhz, so he thinks that OCP must exist somewhere around 1.375v.

[wekktor]

is it safe to use 1.375v for just benchmarks with low temp if I run it at stock otherwise ?

[jeanjean15]

Overclocking is working in Vantage!

Nice job.

How did you succeed in going past 900 mhz for the gpu ?

Is your 5870 an asus model or did you flashed it with asus bios ?

[Oese]

is it safe to use 1.375v for just benchmarks with low temp if I run it at stock otherwise ?

lets have a look at your temps to say so wekktor

[Nizzen]

Nice job.

How did you succeed in going past 900 mhz for the gpu ?

Is your 5870 an asus model or did you flashed it with asus bios ?

I have the Asus model. Just installed msi afterburner and put the vgpu up a bit, and overclocked

Very easy

[CrimInalA]

come on everyone , post your results

[Oese]

yeah, especially pwm (vrm, vddc phase 1-4) temps

[wekktor]

I can try 960/1200 1.18v and report the max vrm temps. I can try Race driver GRID and Colin Mcrae Dirt. Do you think I should do it ?

[Oese]

yes pls )

[wekktor]

ok

Now I have played the 2 games and the maxtemp was with 960/1200 1.1875v and 75% fan

VRM MAX temp 1 to 4
51
53
54
53

but that was actually in the menu in GRID, but when I race the maxtemp I saw was only 46c

[Oese]

thats with stock cooler right?

well mine are a bit higher then with 1000/1300 @ 1,275v i reach around 75°C

but only passive heatsinks glued to them...

[wekktor]

yes Im using stock cooler

[jaredpace]

Someone with a 5870 and a 5850 can you please test the efficiency of the stock fansink:



With 5850 and 5870 at same core speed, same fan speed, and same gpu core voltage, what are load core & vrm temperatures? How much better is the 5870's quad pipe fansink?

[Oese]

here again my gpu-only cooling solution

[wekktor]

Nice!

is it going to be your 24/7 clock ? If I only get 55-58 on the gpu with 1.275v do you think it is ok for me to use it for 24/7 ?

[Oese]

yes i think so...

atm i need 1,3v though in crysis otherwise it will set the clocks back to 900/1300 in intense situations...

could you test pwm temps with atitool? i'd like to know if my passive heatsinks are actually worse then stock heatsink at least for the pwm...