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Water vs air cooling for OC?

post #1 of 6
Thread Starter 
So I have a reference GTX 670 and I am able to OC to 1235/1705 on air (which is stable in 3Dmark vantage high and in BF3 maxed out), but when I slap on an Antec 620 water cooler on the core and place a bunch of fans around to cool the rest of the card, I can't get anything stable over 1100/1705 in 3Dmark vantage under the same settings. I can get a bit of a higher OC for Heaven benchmark and in some games, but it is only stable for the first 15-30 minutes and then it randomly red screens/crashes afterwards.

Does anyone have a good explanation of what is going on here? Does this have anything to do with how high ASIC quality cards OC better on air than on H2O? Also would getting an Accelero Twin Turbo II give this same result as the Antec 620 mod?
post #2 of 6
Are you sure you are doing it right? Do you have heatsinks on the rest of the card, or are they just bare? Could be something getting too hot I suppose if you arent cooling the rest.
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post #3 of 6
You may have tightened the retention bracket too much, which I am told can cause actifacting.
The RAM or VRMs may be overheating, so try putting some mini heatsinks on and possibly adding a fan.
post #4 of 6
Thread Starter 
Thanks for the response guys. I have small heatsinks on the VRAMs and I have fans blowing onto the card to cool the VRAM and VRM.
post #5 of 6
Thread Starter 
Does anyone else have any experiences similar to this?
post #6 of 6
Thread Starter 
Quote:
Originally Posted by Art Vanelay View Post

You may have tightened the retention bracket too much, which I am told can cause actifacting.
The RAM or VRMs may be overheating, so try putting some mini heatsinks on and possibly adding a fan.

I recently got Dwood's bracket and I have it on pretty loose but it is still having the same issues. The area is pretty well ventilated and I have a lot of extra heatsinks on.
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