I have 2500k,Amd Radeon 6950 1gb,kingston 1600Mhz 8GB,,asrock z68extreme4,2 hard drives. I will be doing some overclocking!! According to this guide about psu in sticky, 650w would be enough,but I am not quite sure. Is 650hx really enough or should I go with 750HX? Thanks!!
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The 650w is more than enough for your build, you'll want a 750w psu if you're going to crossfire 6950's in the future.