Here is something I have read,
"You will notice that both PCI-E connectors are joined to take 12V3 all to themselves. Which, I remind you, is rated for 25A. This means that you should be able to run a single GTX 280 on this bad boy, but one only. And really, SLI on those things takes something bigger than 650W anyway."
GTX 560 Ti has a TDP of 170 watts
AMD Phenom x4 955 [125 Watt TDP]
hunter315 you are right sorry, dident see the Green part.