it depends on your motherboard, i have a A8N SLI premium with a 7800gtx and it fits just fine. although i had problems with the 4 pin 12v and putting in my memory cause its so big, that it overlaps everything.
did you try to connect a 20 pin power connector at all? also, you should be fine with the power supply you have now, i had a 450Watt and ran my 3800+ with 2 drives and an 6800 ultra and like 6 fans and LED's
hi, i had somewhat of the same problem, when i thought it was my PSU, but my psu was good. i have a asus sli-premium with 24 pin power, which was my problem to begin with. when i switched to a 20 pin connector, then started it up and then it worked fine.
onother problem i had with my old...