you dont need to plug it in. 
im not shure what its for, but this is my 3rd pc that runs without that cable 
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Newton is dead, Einstein is dead, I don't feel very well either
Xfire - Mirrari
Intel Q6600 ( @3.6GHz)
Asus Triton 79 Amazing 549/3200
4x 1Gb Corsair XMS2 DDR800
Asus Maximus Formula
Asus & Sapphire HD3870 512Mb ( 850/1180 )
Corsair HX620W PSU
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