I suggest you sell your components separately and start over. Your video card should work with most pci-e boards; 478 boards with pci-e are relatively rare; if your asus doesn't work, it may be due to your power supply or a software conflict. I wouldn't spend any more money on 478 or ddr. Best bang for your buck is 775 with closeout ddr2; you can find some 2x1 gb ddr2 kits for around $30 used if you look around; g31 boards are cheap for 775 cpus. I use both am2 and 775 for my systems. But don't pay full price; if you do, might as well go with socket 1156 and ddr3 for a long term solution.