OCC has published a review on the XFX XPS-650W Power Supply

The XFX XXX Edition 650W power supply is certainly worthy of consideration for use in any high gaming system and will easily handle any single high-end graphics card gaming rig with plenty of room to overclock. There are a total of four PCI-E connectors available on this power supply so crossfire or SLI is definitely an option but keep an eye on power requirements especially with the more power hungry Nvidia offerings.

XFX XPS-650W Power Supply Review