The GTX 480 will include a 2x6-pin PCIe to 1x8-pin PCIe adapter, so yes if you use that then you'd be fine.  You'd use that one adapter which will use up 2x6-pin PCIe plugs, and you'd need a 3rd PCIe 6-pin to the GTX 480. 

If you went SLI you'd have to use 2x6-pin to 1x8-pin twice, leaving you no more 6-pin PCIe connectors, but the cards will also include 2xmolex to 1x6-pin PCIe adapters.  I wouldn't recommend that however, as PSUs that don't have 8-pin connectors generally aren't going to be sufficient to run newer high-draw GPUs like the GTX 480. 

Also, don't try and use the EPS 8-pin for a graphics card, its keyed differently for a reason.

I would only suggest the 2x6pin to single 8pin adapter.

ycgerard

The 2x6 -pin pci to 1x8-pin is too short to connect to my card. Would the pic above work do you think?

I dont' see how that's possible unless the 2x6-pin are too short to connect to your card also?  If you mean they're too short to conceal all the connections than ya that's understandable, but these adapters are meant as a last resort kinda option to get what you have available working.  If you want everything to fit nice and tidy you'll have to buy a PCIe 8-pin extension cable or a new PSU.
 

double check that the power supply is providing enough current on those rails.

I have an enermax galaxy 1000W, and I have to swap it out because the 12v rails aren't able to handle the current draw for the 480's.