I can't seem to find out what is required in the way of a PSU for the GS-8400 and GT-8500 Nvidia card series. I've tried downloading several manuals from different makers and all I've gotten is every spec but wattage. I'm guessing either 300 or 350 Watts (respectively) or 350 or 400 Watts (respectively), but it would be nice to see it in writing. Anybody ? Any Moderator, I did a whoops thinking I was in "Audio and Video" when I started the thread. Please feel free to make me look smarter by placing it there......, he said sheepishly.