|I doubt that a 9400GT PCI would provide much of a boost over the 6200. The PCI bus provides 133MB/sec of shared bandwidth. Today's high end hard drives can sustain around 90MB/sec and can burst 280MB/sec. If PCI can limit HDD and gigabit ethernet performance, imagine what it does to 3D video performance.|
IMHO, you should avoid buying a new processor and video card. Keep saving till you can build a PCI Express system. A 16-lane PCI-E 2.0 slot provides video cards with 16 GB/sec of total bandwidth (8 GBps up/ 8 GBps down).
Dual core Opteron 185 @ 3.2GHz on A8N32-SLI Deluxe
4GB of CL2 PC3200
2x 8800GTS in SLI
Blu-Ray and HD-DVD
X-Fi Titanium for PCI-E
Samsung 24" LCD