hello,i am tired of finding what was causing the problem. the problem: lag in NFS: HP(2010),Guitar Hero: World Tour lag in WMP 12 any blue ray or hd playback the solution: simple just exit aida 64 & the problem just vanishes. my system config: Mobo-Gigabyte X58A-UD3R(Rev 1.0) CPU-Intel Core i7 930@3.8Ghz CPU Cooler-Thermaltake Frio RAM-Corsair XMS 6GB DDR3@1448Mhz GPU-MSI GTX 580 1536MB+Gigabyte GTX 285 1GB as a dedicated physx PSU-Gigabyte Odin pro 1200 Watt, SLI certified, 4 w