I recently installed new CPU ( Core 2 Quad Q9550 ) and since then every time I launch some game whether it is watch dogs , Call of duty 4 , Godfather 2 ... I play for about an hour and then the game freezes and I hear some noise ( trrrr ) and then colors on the screen mix up and I see blue y, yellow , green ... just freezed. Or I just get blue screen saying atikmda.sys or dxgmss1.sys - and it happends EVERY TIME or sometimes it doesnt even say anything just 0x00009 something like that. So what should I do? GPU : Radeon HD 7870 MSI OC Edition , Motherboard : P5Q SE/R 4 GB RAM ddr 2 . I used to have Core 2 Duo E8500 if that helps. And I updated all drivers for graphic card. I have windows 7 64 bit