Oh, and the graphics card... the programs you use to make 3D content, don't they use the GPU for 3D acceleration? If they do, you should probably get a beefier GPU... if not you're OK.
The 460 W power supply is more than enough for the specs you showed, given that the GT 440 doesn't use much energy.
My Mario Kart Wii friend code: 2707-1866-0957







