hello and welcome, could you shed some more light on the current system you have i.e manufacture make and model, CPU ect.
once that is known then it makes upgrade advice alot easier. thanks

Dell Dimension 2400

Motherboard
CPU Type Intel Pentium 4A, 2800 MHz (5.25 x 533)
Motherboard Name Dell Computer Corporation Dimension 2400
Motherboard Chipset Intel Brookdale-G i845G
System Memory 1024 MB (DDR SDRAM)
BIOS Type Phoenix (12/02/03)
Communication Port Communications Port (COM1)
Communication Port ECP Printer Port (LPT1)

CPU Properties
CPU Type Intel Pentium 4A, 2800 MHz (5.25 x 533)
CPU Alias Northwood, A80532
CPU Stepping D1
Original Clock 2800 MHz
L1 Trace Cache 12K Instructions
L1 Data Cache 8 KB
L2 Cache 512 KB (On-Die, ATC, Full-Speed)

CPU Physical Info
Package Type 478 Pin uPGA
Package Size 3.50 cm x 3.50 cm
Transistors 55 million
Process Technology 6M, 0.13 um, CMOS, Cu, Low-K
Die Size 131 mm2
Core Voltage 1.475 - 1.55 V
I/O Voltage 1.475 - 1.55 V
Typical Power 38.7 - 82 W (depending on clock speed)
Maximum Power 49 - 103 W (depending on clock speed)

I'm just looking for a few compatible and cheap upgrades so I could run a few games, till I acquire all the parts for my new system. I need to know if I could install a Daul-Core and If someone could help me find a graphics card that's: PCI Slot, shader model 2.0, has a decent amount of memory and from a reliable purchasing site. I seem to have trouble finding a good PCI gfx card.

EDIT: Guessing any daul core processors available with a 478 socket/pin would be worth a try maybe?

Thanks for the help. Ill probably just get that card, and install the one i have now into the family room computer. As for a gaming rig. I'm building my own, and I want it to last for a while (technology wise) so I'm building something pretty expensive (most recent parts). So i'm saving up for that.