Card is EVGA 280 and I have submitted a ticket to EVGA support and nVidia Forum. However, I felt this is something that the people here may find interesting. I hope it is in the correct section - it may be a driver issue rather than hardware. I would like to consider this a bug report really. When Vista Aero is NOT ON - Moving certain applications around causes EXTREME flickering. (So bad you can not actually see the screen). A great program to check this with is the EVGA Precision app or CPUZ etc. I have tried with latest drivers and slightly older ones too. 177.41 - 177.39 It also happens badly when playing a track in my digital audio software Cubase. Here are some factors which may help you to reproduce this: This only happens when the card has throttled down (to 300 or 400 Mhz etc.) My screen is 30" and native resolution is 2560x1600@32 bit I tried lowering the resolution and the flickering went away when at resolution of 1024x800 but obviously I can not use that resolution. As mentioned - This only happens when aero is OFF but I can not use aero as it interferes with the audio ASIO drivers. Aero is also FORCED OFF in some games - Flight Sim X being one which is very important. If I FORCE the Clock rate back to 621 or higher - the flickering goes away even with aero off. But it doesn't last long because the card will soon throttle down again. In 3D games that do NOT allow the card to throttle down there is obviously no flickering. I did not have this issue with my GF8800GTX. Cheers, Phil P.