Well a Antec 380w Earthwatts could, but not sure how long it would last. Especially in a small enclosure and if the cooling isn't sufficient. See my link in my signature about the capabilities of the 380w PSU. I'm not sure about a small PSU, but I'd go with a Antec 430w Earthwatts PSU at a minimum with a 8800gt. Not sure if I'd put a 8800gt into a small case, because it's known pretty well at running hot. You could get by with a lesser PSU for the 9600gt or the 3850, since they don't require as much power as the 8800gt.