Can I buy an AMD ATHLON 64 X2 4400+ AM2 Dual Core Processor and….?
The processor has no bearing on weather or not you can use the GeForce 8500GT you need to make sure the mother board has a PCI-E graphics card slot (not AGP) and even if the PC has on-board graphics you can upgrade to the GeForce 8500GT. I don’t know the clock speed of the AMD 4400+ but it doesn’t matter because the 4400+ tells you what you need to know as far as speed of the chip and a AMD 4400+ will be fast enough for any application or game you want to run just make sure you have at least 2GB of RAM and your hard drive isn’t over 50% full.