I have a Dell 170L tower and I noticed it has a 250 watt ATX PSU and it has 16A on +12V. Is this PSU powerfuly enough to run any standard PCI type video cards. The motherboard doesn't have AGP slot so I have to use standard PCI cards. The onboard video chip uses AGP though. I know there is a GeForce 9500 GT 1GB PCI card on Newegg.com but will this PSU be powerful enough? It says it needs a 400 watt and 12V have 18A PSU but I thought that maybe 16A on +12V would work somehow but maybe I just need to upgrade my PSU to a 400 watt or something around there.