Longish story. Went out and bought an ATI X1950 pro to replace this crappy onboard Geforce 6150. Came home tried to put in and then upon looking realized that HP had put the crappiest power supply in the planet into this computer. How it even works with a meager 300w is beyond me. So now i have to find a new preferably atleast 500w power supply and i have no idea what i need to find. Heres the specs if it helps. 2 Gigs of some kind of ram AMD 64 X2 4800+ (Dual Core) Lightscribe DVD/CD Burner/Reader 15 in One memory card reader HP Media Drive Bay Onboard Realtek surrond sound. onboard geforce 6150 320 gig something harddrive And for expansion its got 2 pci 2 PCI-E (One x16 one x1) and 2 more slots for ram. expansion bay for another optical drive expansion space for 3 more HDDs. And im completely clueless as to what i would need.