My PSU is an Antec BP500U that was purchased 3 years ago and has 2 +12v rails with 18 amps on each +12v rail. Here's an MSInfo32 report with my system specs and setup. I was wondering if the PSU would be able to handle a 6850, and whether or not it would be able to handle overclocking the card on any level at all. I've decided that since my computer has decent specs already, that I would simply upgrade the GFX card and monitor instead of building an entirely new computer from the ground up.
A Visiontek 3850 256mb launch model. Got it right when it released around the holidays. Sorry for the late reply, I haven't had internet access since about 11 am because my ISP had a citywide hardware failure earlier and it was just now fixed.