Amps or watts?

I built a budget gaming rig for my son. Was running fine until I put in another graphics card (radeon 4850 x2) and now it wont display. The card works in another rig but nothing in mine. So I am curious if it not enough amps.Now it runs fine with nvidia geforce 8800 gts. any help would be great. thanks
MSI 890fxa-gd70
gskill 8gigs mem
320 wd hard drive
apevia 680watt psu
amd athlon II 3.3 x3
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