PSU for an X1900??

Hey there guys... I was wondering if my Antec NeoPower 480W will be able to handle a X1900 CF card? I know they say you need a 550W PSU, but I read an article somewhere (I forget) that even with 2 x 7900GTX's in SLI and a bunch of other things, the max PSU load was only like 489W or so...and I sure won't be running a dual card config anytime soon... Thanks guys!

Forgot to mention that according to this PSU Calculator (http://www.extreme.outervision.com/psucalculator.jsp), all I would require is 442W... Does that sound right?

You should be o.k. Just make sure you keep that unit cool.

hahaha I shoulda known you were gonna say something about that SN... Check this out... heres a pic of a spare 80mm fan i rigged to help oull some of the hot air away from the PSU:




And heres a pic of my PC while running: (yes I know its a little messy, but its the best I could do b/c the case is so small)