I own a Dell XPS 420 w/ Quad Core Q8200 @2.33Ghz 6gb DDR2 RAM @ 800mhz with a 375 watt PSU. My current video card is crap. I have a ATI Radeon 3450 that I want to upgrade. Only issue is that the Video cards I want to buy all recommend PSU's with over 450 watts. DELL told me I could only upgrade my PSU to 425 watts??? Is this accurate? Would I blow out my motherboard or something if I purchase a higher wattage PSU? I am obivously not the most computer knowledable but I feel confident I can do the upgrade myself. I hope anyone with expert knowledge will provide some sound advise as Dell has been no help what so ever. I have spent hours going round and round. Their tech support rep knew less about computer components and their function than myself. The rep couldn't even answer basic motherboard specs for me so any advise would be helpful. I am hoping to purchase a mid to upper range GPU with the needed PSU to upgrade my system and just want to make sure I buy the best compatible choices. Any help would be so appreciated. Thank you. Nic