My New PC Build in Building, Troubleshooting & Modding Posted September 12, 2011 1 thing for people to note though. The 850W modular PSU did not appear to have enough power for everything I put in the machine and I was 1 x SATA cable short...so had to add that later. The only way the guys could get the 2 graphics cards working was by some minor miracle fiddling and cable magic stuff (that I don't understand). Word of warning, that's all. this makes no sense at allthat psu has 12 sata plugs and from what i can see you are only using 4 two 6950 in cf is fairly straight forward and if your not sure you check the manual there is two cf bridges on in that pick fairly sure you only need the one but i dont think it matters I had the same question on the crossfire bridges...and from what I read, it recommends you use both connectors in case you lose some connectivity (albeit momentarily) in either / or. As to the PSU, I honestly have no idea. Completely outside my area of expertise. I do know that there are: 2 x graphic cards 2 x HDDs 1 x SSD 1 x HDD Drive Caddy 1 x DVD drive all hanging of the PSU...plus of course the MoBo. Anyway, the thing works, it's cool (don't think the CPU has been above 40 degrees yet) and it's fast and it's mine, all mine!!!!