I have a the same card and the requirements are a 300w psu as stated above, but also 22amp 12vrail min.When I first got the card I had a 20amp 12vrail and it ran fine no hiccups.A few months ago I picked up a Ultr X Connect 500w psu 34amp 12vrail, because I planned on over clocking the whole system.
oh crap you know that dell makes crappy products so the psu could give out at aany minute oh wait rdram nevermind that pc was built when dell actually made good parts but just to be safe get a new psu with 300 wattage in that vicinity
I ran a 6800gt agp on a light as a matchbox 400w psu (shite free with a case job) for a while with no probs, but then after a while hdd's started switching off etc, so ended up upgrading after a while anyway
Are you talking SLI?, 'cause there's no way a single card is gonna draw 22 amps.
I know for a fact the BFG 6800GS OC AGP draws 18A, because I have it. I wouldn't be surprised if a single 7800GTX 512MB can draw 22A.
Anyways, you can try to run it on that PSU, but I wouldn't recommend it. It might run for awhile, and then burn out. If I were you I'd get a safer, more stable PSU (you can get a good PSU for as low as $40) and stay on the safe side rather than risk frying your video card.
Those BFG lifetime warranties sure can come in handy though, can't they?
If it's running fine then good for you. But with less power your graphics card settings would automatically sets to low. But if your not getting a message that your graphics card needs more power, then you're fine. Buying a 350 watt psu would only set you back $25-$30.
The 6800gt and 9800xt both have a min of 300w psu, how can there power requirements be much different. A 6800ultra would be pushing it but not a gt.
A dell 250w psu if rated as max output like the rest of the market is 345w, more than enough for a 6800gt.
As I saif there are plenty of people running the 6800gt on a dell 250w on the dell forums.
6800ultra's are just overclocked gt's with extra power. Exact same core/chip needs, just slightly higher vcore.
Minimum requirements don't mean jack. Why do you think the high end 6800's are notoriously hot?