Also note that the Pentium D draws a lot of power . With the combined processor and video card, you'll need more than 280W. I'm actually surprised you can get away on just a 280W PSU with just the processor alone. They use approximately 180 W idle and up to 250W when under load. You can get away with a 350W PSU (although you'll still need to upgrade ) with either nvidia card, but get at least a 400W for the ATI radeon x1300.