|"Does it matter if it was a new build or rebuild?"|
Yes, it makes a big difference. And why haven't you listed the hardware specs, you've been asked more than once? Myself & others have wasted hours of our time trying to help & then you finally tell us that your 8400GS is friggin PCI video card? It's 2010, who the hell uses PCI graphics anymore? It wouldn't matter if that card had 1024MB of memory, it's performance is choked by the outdated PCI bus that only runs at 33MHz & has very limited bandwidth. It's no wonder the integrated graphics outperformed it. You must have known your board (model not disclosed) had a PCIe x16 slot, what possessed you to buy a PCI card?