AboutBobbert Expertise I can answer technical questions about installation, use, and maintinence of most 3D Graphics hardware, and software. I can offer assistance with overclocking (while I do not suggest overclocking while under warranty) and I can give assistance with more complicated problems to the full extent of my abilities.
Experience I have been into computer hardware, especially 3D graphics and the hardware that drives them, for a number of years. I have knowledge in installation, use, troubleshooting, purchase suggestions and over clocking.
He has a Sony Desktop PCV-RX670 The specs are at the following link. =) He would like an NvidiaGF between 5-7 (something good enough so he may use it if he buys another PC. so preferably PCI) Which is recommended to use an AGP4x or PCI?
I don't know if the motherboard has power for these cards so attached is a link to pictures of the motherboard. (although there are 2 white rectangles next to the PCI with 4 pins in each coming from the motherboard, could this be available power for PCI cards? )
Answer Those 4 pin connectors are power inputs for the mainboard, which are likely unused (probably for extra features or different iterations of this model, not an uncommon trait in OEM systems).
As far as AGP vs PCI, PCI will provide less performance, AGP is the obvious choice for performance, however it won't translate to a new computer. Honestly given the rest of the system's specifications, I'd get a new computer, that Pentium 4 is going to struggle with Halo and TF2, and will simply fall flat on its face in FEAR.