HD5850 overclocking

[iB CoMpL3XiTy]

Hey

I recently downloaded and installed 3DMark11 and ran the benchmark with both my HD5850's at 1000/1225 @ 1.275V (using MSI AB to overclock/overvolt)

The test completed and I got a score of roughly P8200, I later came across the 3DMark11 benchmarking results thread here at OCUK and thought I'd re-run the test and post my results, However when I re-ran the test with the same exact settings I got a BSOD during the first graphics test, I then tried running the test at 980/1200 @ 1.275V and again received a BSOD. I then tried 950/1200 @ 1.299V and again received a BSOD...

This I found very odd that I had previously ran the benchmark at 1000/1200 @ 1.275V but now could not even run the test at a smaller overclock with more voltage.

Today I've been playing around with the Metro 2033 benchmark and first ran the test at stock clocks and the benchmark ran fine, I then decided to Max the CCC limits with I believe is 775/1125 and re-run the test, but I got another BSOD, This I find VERY strange as I know from previous testing that both my cards are stable without voltage adjustments upto 910/1225 (previously tested with unigene heaven, crysis and furmark)

Both cards are watercooled and don't exceed 34C under load, Power supply is a Corsair HX850. Oh BTW when I get the BSOD's it mentions atiumdag which I assume is something to do with the ATI/AMD driver.

Any help is much appreciated, thanks in advance.

 

[powelly]

I think i can help here i had this problem i would get bsod every time i overclocked what i did was go into my bios and reset it then reboot and after that you can overclock it or what ever you want and it should work fine
hope this helped

 

[iB CoMpL3XiTy]

Just reset my Core i7's OC back to stock and set my RAM to run at its rated speed and voltage

Set both my cards to 1000/1200 @ 1.287V (haven't tried a lower voltage) and it passed metro 2033 which is great but also confusing as I played about 3 hours of L4D2 and CODWAW last night without issue and have had my 4Ghz overclock in my CPU for along time now. Is this a PSU issue?

Or maybe just an unstable CPU?

 

[jewii]

well l4d 2 and codwaw aren't really that demanding, i know from experience metro 2033 eats your pc up. when i oced my gpu's, it was stable on crysis but artifacts occured on metro 2033 ...

best thing you can do is trial & error.

but first, when you overclocked your i7, did you test for it been stable? i.e. prime95?

also for overclocking gpu's. ati tool is great for checking stability.

it could be PSU issue but very unlikely. also stability does drift overtime, i overclocked my i5 750 to 4 ghz with 1.2 v, six months later i did a prime test again and it was unstable so had to up the voltage.

or it could just be bug like the guy above says. i know my gpu went unstable when i first oced it through CCC, the next day it was fully stable :s so who knows.

 

[iB CoMpL3XiTy]

1000/1200 @ 1.287V crashed after some more testing, screen lost signal. I'm thinking the BSOD's are caused by my PSU and the signal loss is caused by unstable GPU overclock but im not sure, just a feeling.

Any more help?

 

[iB CoMpL3XiTy]

well l4d 2 and codwaw aren't really that demanding, i know from experience metro 2033 eats your pc up. when i oced my gpu's, it was stable on crysis but artifacts occured on metro 2033 ...

best thing you can do is trial & error.

but first, when you overclocked your i7, did you test for it been stable? i.e. prime95?

also for overclocking gpu's. ati tool is great for checking stability.

it could be PSU issue but very unlikely. also stability does drift overtime, i overclocked my i5 750 to 4 ghz with 1.2 v, six months later i did a prime test again and it was unstable so had to up the voltage.

or it could just be bug like the guy above says. i know my gpu went unstable when i first oced it through CCC, the next day it was fully stable :s so who knows.

Yes metro 2033 is extremely demanding.

When I first reached 4Ghz about a year ago it was OCCT 8 hours stable on 1.26V, now it needs 1.31V to be stable, so maybe it just needs more vols again.... I haven't checked CPU stablility in along time, Although the only time it BSOD's is when I overclock my GPU's.

I think I'll put my CPU overclock back and run OCCT again for 24 Hours, and also start from scatch with my GPU overclocking....

 

[Boozebeard]

From my experience, if a graphics card overclock fails then you are going to suffer artifacts and screen freezing. Don't think I have ever had a BSOD from a gpu overclock so imo it's most likely your cpu/memory thats the problem.

 

[iB CoMpL3XiTy]

Just testing my CPU overclock atm, I set the voltage for 1.32500V in the BIOS (Vcore) and in windows Idle its 1.29V and under load its flickering inbetween 1.248V and 1.264V.

That seems like a lot of vdroop (or vdrop, can never remember which is which) doesn't it??

 

[iB CoMpL3XiTy]

4Ghz with 1.325V failed after 22 minutes, not willing to put any more voltage through it, so now trying 3.8Ghz with 1.317V

Didn't know CPU's degraded this fast...