My power supply:-
http://www.newegg.com/Product/Prod [...] 6817153038

Its specs
Input Current 10A @ 115V, 5A @ 230V
Output +3.3@30A,+5V@28A,+12V1@18A,+12V2@18A,+12V3@18A,+12 V4@18A,-12V@0.8A,+5VSB@3A

Connectors 1 x Main connector (20+4 pin)
1 x 4+4-pin 2V Power Connector
8 x peripheral
6 x SATA
1 x Floppy 2 x PCI-E

Also will I have any problems fitting in the two cards on this mobo ?-
http://www.newegg.com/Product/Prod [...] 6813136049

Thanks in advance.

That is powerful enough, I have the non modular version of that. The only problem is it only has 2 PCI-E 6 pin connectors so you will have to use adapters for another 2 connectors. I remember a while back a review where they ran 2 8800GTX's in SLI with that PSU so it's powerful enough.

I am planning on Crossfire when the 1gb 4870's are released and I was trying to decide if I would be better off selling my PSU and getting something with 4 PCI-E connectors or just using adapters and I still haven't decided yet. If you decide to use adapters just make sure they are on different rails, the PSU has 4 rails 1 for motherboard, 1 for PCI-E, I believe 1 for the molex connectors and 1 for the SATA connectors.

Yea man, solid psu that. Just make sure you balance the load on the different 12v lines if you decide to use adapters