AMD had produced a few microprocessors rated at 3000+,
they can fit in one of the following socket.....
socket 939 ( PCI-e/AGP)
socket 754 (PCI-e/AGP)
socket A (AGP)
and i can't make sure which one u r talkin about.
In prior to upgrade your computer, you HAVE to do
some research and attain a little bit computer knowledge
to understand what you are doing.
Video cards at present has two interfaces, either AGP or PCI-e.
What you have to know is new motherboards supports PCI-e,
and old ones use AGP.
1. So lets assume your comp is using AGP, since its 2 yrs old.
8600gts series card don't have AGP interface, to use them
you have to switch motherboard.(branding has nothing to do with interface)
2. They are actually the same except their memory , shader and core clock speed, higher clock speed yield better performance but better hardware is also required.
http://www.nvidia.com/object/geforce_8600.html
3. 420w PSU is ok for mainstream users.
If you wanna upgrade your comp i would suggest replacing the
motherboard+cpu+ram+video.
Newly released games demand a lot of CPU, Video and ram resources,
i don't think you can gain a performance boost by solely upgrading just video and cpu.don't forget DDR-1 ram are not cheap.
