Does my motherboard support DDR3 graphics cards?
The graphic card has its own DDR3 memory controller and is independent of system RAM so every motherboard that has a PCI-e slot will support any graphics card no matter what type of VRAM the graphics card uses like GDDR3/GDDR5. The 9500 GT is crap. Get a Radeon 4650 or Radeon 4670 instead. It should work with your Power supply.