I just completed my build and everything is working very well so far. Had a concern about crossfiring with my psu, however. @ 800w, I'm not worried about the PSU being able to handle the cards, etc. My issue is that the PSU only has 3 6+2 pin pcie cables (2 modular, 1 not), while both cards have 2 6 pin pcie cable slots each. My mobo, psu, gpus, etc are all crossfire ready, and I've read several places that this psu can support crossfiring these cards so I'm assuming there is a way around this that I am missing. Is it advisable to find a converter cable to plug into an open 5 pin modular outlet on the psu to 6 pin pcie? I'd prefer not to fry my new components by doing something stupid. Thanks in advance.
CPU: i5-2500k (stock speed, not OC'd)
GPU: XFX DD 6870 x 2 (one currently hooked up)
Mobo: ASRock z68 extreme 3 gen 3
PSU: Coolermaster silent pro gold 800w
RAM: Corsair Vengeance 8gb (2 x 4gb) DDR3 1600
Case: Corsair Graphite Series 600T
HDD: WD Velociraptor 600gb 10,000 RPM