Quick Need SFF Power Supply Help!

[Thanatos.]

So im looking into getting a Shuttle ST20G5 and i was wondering if the included 250w PS would be sufficient for an Opteron 170 with 2GB of ram and a 7900GT? Time is of the essence on this so quick replys would be IMMENSELY helpful. Thank You.

 

[burnin8r]

should be fine, but wear goggles just in case.