Since last sunday morning, I didn't had a single look-up, error message, BSOD or freezing. Heavy gaming sessions, Photoshop CS4, HD video editing all day long. 6 days without a single problem. Boot, re-boot all I want. I even re-enabled ULPS in the registry. The only ''tweak'' I did was raising 2d clock settings from 157/300 to 400/900 (thank you Sargatanas).

EK waterblock + 5970 is rock solid for me. My temps are really low, idle and load, so I don't think there is any ''cold bug''. OC or not.

I think it's more related to the way people are mounting those waterblocks... Or drivers related... Hardware is fine IMHO.