Verified answer

The Dimension is a great PC and I think one of the best Dells ever made. I bought mine in Feb 2007 with Core 2 Duo E6300 @ 1.86GHz dual core and 256MB 7900GS graphics card. Since then I have replaced the processor with a Core 2 Quad Q6700 @ 2.66GHz and a 896MB GTX 260 Core 216 55nm graphics card (and 4GB RAM) and STILL have the same 375w power supply..! Can't overclock the CPU but you can get a quad.

Dell desktops are customizable so we need to see the specs.