Re: Serious Computer Problem
My best guess is that it's a problem with Powerplay. Your GPU is constantly changing between 2D and 3D clocks. Open GPU-Z, and click on the "Sensor" tab, this should display many settings in graphs, including the core and memory clocks. Make sure you check "Continue refreshing this screen..." Next, start a 3D app, play for a while. Then exit and take a look at the core and memory clock graphs.
AMD Phenom II X4 955 BE @ 4.0GHz + TU120E lapped - MSI 770-CD45 AM3 - 2x2GB OCZ DDR3 1333MHz - Sapphire HD 4870 - Samsung Spinpoint 500GB 7200RPM 16MB cache HDD - Tagan TG600-BZ Piperock - (Currently open test bed) - Windows Vista Home Premium 64bit.