I built this back in 2011 , I originally had a sapphire toxic 6850. I got a 23" 1080 monitor off a friend for 30$ so I ditched the 6850 for a sapphire r9 380 and got a 2nd one off jet for 130$ so I got 2 for 280$. So there's the reason for the crossfire that and I've always wanted it. The system at 100% only draws 620w at the plug ( used a kill-a-watt meter to test). I then decided to push the 955 past 3.8 ghz so I ditched the hyper 212 for a lepa 120 water cooler I got for 50$ off jet. I then ordered 3 new rosewill 80cfm fans to replace the old ones and a 110 CFm blaster to run the lepa push pull. I put the cm blade master off the 212 in the front for inflow. I managed to get the 955 to 4.3 ghz 24 hr prime stable at 1.49 volts. I could push it more but my mobo is 4 years old and I need it to last till zen lol.