Whoa, hold on here. You take the advice of the first guy to reply? What if he's wrong?
I can find no reviews for that PSU. Any Vantec reviews I've seen are from 10yrs ago. As such I have no idea what kind of PSU that is. I can use my years of experience to tell you what I noticed from looking at that label. First, they flat lie. They label the PSU as a "675W" (in the upper right.) but that's peak power. "Regular" power is 600W, or at least they claim it is. Real QUALITY PSUs don't label peak power. Just the power they can deliver. Second, the label is incomplete. There should be a square under the two 12v rails saying how much power they can handle together. 18A and 22A are the two most common limits for a rail. A real PSU would list the total output that each rail(s) can do. This one is hiding not only total output (675 vs 600), but also the 12V limit as well.
You'll have to look at your PSU for the GPU/PCIe leads. A 600-675W PSU should have AT LEAST two 6+2pin plugs. My 450W PSU has those. I'd bet anything you have two 6pin plugs at best. Because of the missing info on that PSU I would suggest NOT using it. They aren't being forthcoming with the info needed for a reason.