Rest of my system is:
Antec DF-30 Gaming Case (5 fans in total)
ASUS P8H67-M Pro Mobo (PCIE 2.0 16x/4x in crossfire)
1 x Gigabyte R9 280x Rev 2.0 (1100/1500/1631v stock) / (1100/1500/1095v modded bios)
Intel I5 2400 3.1Ghz (3.4 in turbo mode)
OCZ 60 GB SSD
LG DVD/RW Drive (not currently in use)
Samsung 2GB Green Drive
I am willing to sacrafice clocks/memory/voltage to reduce power consumption so hopefully my current PSU ends up being enough.
Also as a side note. Would it even be worth it? Given the second PCIE slot is 4x 2.0?
PS: I did have two 6950s flashed to 6970s OC'd to 925-950/1375/1225v (depending on game/bench) with no issues.