I just upgraded my video card to a 4850 and I have nothing but problems with it. I have two distinctive problems which are as follows: I get graphical corruption in games regardless of the settings used / clocks used (including stock clocks). Temps never go over 75c load The second is a high pitched audio sound coming through my speakers when running atitool and just before a game artifacts. I have tried the following: Reverting to stock gpu/cpu clocks Underclocking card by 200/300 Reinstalling drivers (driver cleaner/sweeper was used) Removing audio card (creative audigy platinum) Switching PCI-E slots System Specs: Intel Xeon x3220 Crucial Ballistix PC 8500 5-5-5-15 Radeon 4850 Corsair TX750W Gigabyte GA-EP45-UD3P Windows XP Above is a screen shot of what my graphical corruption looks like. I should also note that when this happens, the high pitched audio sound is present. If anyone has any suggestions I would be grateful.