Originally Posted by Borg20001
CPU = AM2+ AMD 770
That's the chipset, not the CPU. Based on it, I'm assuming the CPU is an Athlon II X2 or Phenom II X2.
Graphics card = nVidia Gforce 9800 (I forgot the brand and didn't write it down)
9800 series includes various cards with different power requirements.
9800 GT - requires one 6-pin power connectors - 400W unit needed
9800 GTX/GTX+ - requires 2x6-pin connectors - 500W unit needed
9800 GX2 - requires 6-pin + 8-pin connectors - 500W unit needed
This is pretty much the only sensible option at current prices: Corsair CX500
($30 AR AP today) - 2x 6+2 pin