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Overclocked HD5850 not stable

post #1 of 7
Thread Starter 
Watercooled, and low temps, so that's not the problem. My PC occasionally locks up, and stress tests pass fine.

MSI Afterburner info:

core volatage: 1287
Core Clock: 1000
Memory Clock: 1095 (highest it goes before card goes into perma-2D mode)

People have used much lower volts and gotten much higher clocks
Edited by Z Overlord - 3/23/11 at 5:14pm
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post #2 of 7
Reference card?
    
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post #3 of 7
I would up the voltage a bit more. I run both of mine at 1.35v. Under water temps really aren't an issue, although vrms still get pretty toasty depending on the game. Thing of it is, some have just gotten really lucky. Out of three cards I have owned, one i got to 1080 another I can bench at 1050, although it is somewhat unstable, and the third one, which I blew a mosfet off the board via volt modding, trying to get above 950. It was a non reference which had no voltage control.
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post #4 of 7
With my reference asus I can run 900/1200 at 1.162v
1.250v 1000/1200 and 1.4v+ for 1200/1400 (risky @ stock cooler lol)
    
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post #5 of 7
Thread Starter 
yeah it's reference.

gpu cooling is using this:

http://www.swiftnets.com/products/mcw60-R.asp

with this heatsink for the rest of the card:

http://www.swiftech.com/hd5850-hs.aspx

So I'm set as far as temps are concerned.
Edited by Z Overlord - 3/22/11 at 11:02am
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post #6 of 7
Thread Starter 
Could putting the computer to sleep and then awakening it cause stability issues btw?
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post #7 of 7
Thread Starter 
And my PC locks up usually during non-intensive things I'd say, the screen goes gray and the audio keeps playing.

And It keeps happening during video playback Again stress tests are fine.

Edit: It appears to be a driver issue with 11.2 What a surprise

http://forums.amd.com/game/messagevi...&enterthread=y
Edited by Z Overlord - 3/23/11 at 5:21pm
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