hmm I'll look into that. I did find out though that my Antec Trio is actually right on the mark. Crossfire requirments adds the total amps needed, so that's two 12v rails w/ 19amps each... equating to 38amps which is what my Antec gives so I'm actually ok... but if I upgrade in the future, who knows what amps the cards will need...
Wow looking at that PSU it supplies more than enough amps per rail
+3.3V@25A,+5V@30A,+12V1@28A,+12V2@28A,
+12V3@30A, -12V@0.6A,+5VSB@3A