relax G80 and RD600 will work on your system provided you have a good PSU.
Directx 10 cards are going to need a lot of power.
Dont fret even if your current PSU will be insufficient .
buy an external PSU when the cards come out.
chill man, the interface as has already been said is the same. pci-e.
also, you won't need a pci-e 16 slot or IMO a better psu as long as yours is 500W+.
i may be wrong but i think this whole power debate is a flash in the pan and any decent power supply will do. i ain't too sure if the same can be said for dual GPU setups's though.
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