Should work ok, but it might be faulty, listed below are the specs for it.
Output: +12V1dc Max 20A;+12V2dc Max 20A; +5Vdc Max 50A
+3.3Vdc Max 30A;-5Vdc Max 0.5A;-12Vdc Max 0.8A
+5Vsb Max 2.5A http://www.spirecoolers.com/main/product_pow_detail.asp?ProdID=581
Since I just built a Computer for my nephew using a ENERMAX Liberty ELT500AWT ATX12V 500W psu, running AMD FX57 Cpu, Segate 250gb sata HD, Samsung 18x DVD-RW Writemaster and 2 EVGA 7600gs in Sli,on a Evga 123-K8-NF47-AX motherboard with no problems.