Heya, I'll try give the maximum information about my system first, here we go : Proc:Intel® Core™ 2 Duo E8400 (bought the 06/27/2008) - CM:Asus P5Q Pro - Boitier:Cooler Master Centurion 590 - ram:G.Skill Kit Extreme2 2 x 2 Go PC6400 PQ DDR2 800 - Ventirad: Noctua NH-U12P - Alim: Enermax Liberty 400w - OS: Win7 64 bits Since he happens randomly i can't give u the exact BSOD error, but i'll try update next time it happens. As asked, i joined the .rar with all infos about my system / cpuZ / RaMmon. As u can see my FSB is overclock, CPU Ratio Setting set to 9 and everything else to auto. I never had this issue before, so i think its a recent driver issue. Also, i checked my RAM with Win7 tool, and everything seems fine. Thx in advance, tell me if u need something else. [EDIT] I changed BIOS settings to default then overclocked again with only FSB / CPU Ratio 9 to match with RAM (800hz) Then i started Orthos to test my ram, after 3 hours (Self-test 20K passed!) i don't have any error or crash.