I'll check. What's best to test stability? Furmark or Heaven? I gotta say this cooler is amazing. Did a 15min Furmark run on stock clocks/voltage(925MHz/1125Mv and max temp was 63c, VRM didn't exceed 62c. It was also almost inaudible over my case fans. Edit: Also I think the flickering is unrelated to clocks. Got it again in Arma2 with stock clocks. Driver issue maybe, I'm running 12.11beta6, which I haven't used before. Did a driver sweep before install.