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analyse this (5850 oc'ing)

post #1 of 7
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I have an Asus 5850 on water (full cover), recently i tried 950/1200 with 1.149v and as you see from the attached image, after running 30 minutes of Furmark eXtreme Burning mode, i took it for "stable".

Then, i load Batman AA and guess what; after 10mins i got artifacts all over the screen. Furthermore, as i was watching the loads/temps through G15 custom Everest profile, the load was about ~50% and temps way beyond safe.

Now i'm trying 950/1200 with 1.187v and see how it goes, but any clue why this happened?


PS: I was thinking of going 1000/1200, but after benchmarking (although not stable) and comparing it to 950/1200, i only see 2 fps difference - but ~10C in temps. So, i'm thinking of just stabilising 950. Your thoughts?


[edit] i use Afterburner 1.5.1

Edited by Athanasios - 6/10/10 at 5:39am
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post #2 of 7
Unfortunately, furmark only stresses the GPU core, and the only time you'll see memory related errors in it is when the clock is FAR above the card's limit. The best way to test the memory is just to game for a little bit. I'd try turning the memory down in 20mhz increments until you don't get any artifacts.

Also, I was in a similar situation to you, and I'd just stick with 950 core clock. I can run 950mhz with 1.18v, but I need 1.275 and a much higher fan speed to keep 1ghz stable; the ends don't justify the means.
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post #3 of 7
You will gain 10C in furmark at 1ghz core. Try testing just regular games. I wish my card had voltage control damnit. Gigabyte puts a top notch cooler on my card and doesn't allow voltage control to mock me.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Thosesneakyfrench View Post
Unfortunately, furmark only stresses the GPU core, and the only time you'll see memory related errors in it is when the clock is FAR above the card's limit. The best way to test the memory is just to game for a little bit. I'd try turning the memory down in 20mhz increments until you don't get any artifacts.
i see, didn't know that. I did realise that game "stressing" is not the same with Furmark/generic bench testing but i couldn't explain this; for example i see 99% load in bad company 2, but the vrm temps are same like "idle" temps... which means that furmark is stressing the card in a different way.

Quote:
Also, I was in a similar situation to you, and I'd just stick with 950 core clock. I can run 950mhz with 1.18v, but I need 1.275 and a much higher fan speed to keep 1ghz stable; the ends don't justify the means.
The memory is not the problem, the core is.
For example i was 100% stable (furmark + gaming) with 900/1200 at 1.137.
The difference between 900 - 950 core is ~4 fps, with only a small temp increase (~5C), close to 84C as in the image. But 950 - 1000 gives only 1-2 fps for +10C (~94C), which as you said is no-deal.
Although i've read around that in order to see more fps increase at 1Ghz, you also need the memory beyond 1200 (say 1250).

I guess i'll stabilise it at 950 and then focus on cpu oc'ing.
Edited by Athanasios - 6/10/10 at 6:30am
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post #5 of 7
I run my Diamond reference 5850 at clocks in my sig 1080/1175 at 1.35v with a full cover block. You just need more voltage than what you are giving it. With that block you should be able to safely run 1.3-1.35v safely without temp issues. At that voltage, 1k+ core speeds is definitely within reach. Doesn't help much with mem though. I can't hit 1200 on my ram no matter what I do. Don't use Furmark to test for stability. Use real games at max settings to test for stability.
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by Valafar View Post
I run my Diamond reference 5850 at clocks in my sig 1080/1175 at 1.35v with a full cover block. You just need more voltage than what you are giving it. With that block you should be able to safely run 1.3-1.35v safely without temp issues. At that voltage, 1k+ core speeds is definitely within reach. Doesn't help much with mem though. I can't hit 1200 on my ram no matter what I do. Don't use Furmark to test for stability. Use real games at max settings to test for stability.
what temps & fps are you getting after running Furmark Xtreme Burning mode for 10-20 mins?

I know 1.35 is the max safe, but it looks to much to my eyes.
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post #7 of 7
Quote:
Originally Posted by Athanasios View Post
what temps & fps are you getting after running Furmark Xtreme Burning mode for 10-20 mins?

I know 1.35 is the max safe, but it looks to much to my eyes.
I'm on water, my GPU never breaks 50c, although vrms will still get toasty under furmark hitting 115c. Only furmark gets my vrm temps that high though. Under general gaming though I never see vrm temps break 80c. I feel I could run higher volts without issue with some vmods and ocp mods. 1.35v is the highest I can do without card throttling due to ocp.

Haven't run Furmark in a long time but still had a screenie of where I ran Furmark for 30min at 1080/1100.

edit: Also if your having probs with pushing memory you may have better luck using rbe to flash the asus 5870 bios(only if you have a reference design) as in my experience the 5870 bios seems to have relaxed mem timings compared to the reference 5850 bios.

Edited by Valafar - 6/10/10 at 8:41am
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