So i want to upgrade my pc not alot i play only cs:go my cpu is intel core 2 quad 6700 and i have a geforce gts8800 512mb gpu and 4gb of ram, i get 30 to 120 fps in cs go on lowest settings.Is there a cheap upgrade that can fix that?I wanted to buy a gtx 750ti 2gb gpu but i dont feel comfortable buying it on ebay since there are alot of scammers and it could come disfunctional.