i have a GeForce 8600GT 512MB ram with a core 2 quad q6600 (2,4ghz, 65nm)
and i had never problems with all i have done on this pc. this cpu does great work. the only thing i blame is the boxed fan. the cpu produces not less heat. so but this model isnt available anymore. they´re new and efficienter now and with 45nm arcitecture.