Hi I just recently bought a new pc it has a apu 6400k processor 6gb ram and a gtx 620 gpu . I recently upgraded my gpu to a gtx 660 twin frozr oc but the games still seem to run slow I also upgraded the power supply to a 750w . Is the cpu bottle necking the gpu . Also my cpu seem to be running at 100% all the time . If it is the cpu can anybody tell me what cpu would run better with the graphics card .Thanks