i used to have gt210 gpu and pc was perfect but when i bought new gpu (gt210 1gb ddr3 i changed it to gt630 4g ddr3) and a new cpu (core2duo2.2 e4500 i changed to it to core2duo e8400 3.00ghz) and 4gb ram and pc crashing and freezing and restart i think ram is the erorr cause i removed it and replaced it alot of times can u please tell me why pc crashing and show me blue screen sometimes without playing only using google chrome and i have another issue i play BO2 on 60-110 FPs but all the time crash and cause pc freeze and sometimes blue screen appear while playing so i need to know if the ram is the erorr or no cause ddr2 in here so expensive