I stumbled upon this site also. I was wondering if anyone could help me. Im planning on putting in a PCI FX5500 v.29 256 mb video card into my dimension 2400. However, Im unsure if this would require a new PSU, or would i be able to run it with my current 250 watt PSU? If i cant use my current PSU would i be able to replace it with this Enermax EG651p-VE (650 Watt Peak) that my friend gave me. I realize that this would probrably be more then i could ever use with a dimension 2400 but i would really hate to buy a new PSU. Also if i do use this PSU would it waste more power than if i were to use say a 350 watt psu. Thanks Alot