Thanks Zalbard and Sam Oslo for the info,
So, both the Xeon X5650 and i7-980x are equivalent ? Does somebody know what the difference between the 2 cpu ?

Sam,
What stepping is your X5650 working with GA-UD7 ? Can you use the B0 stepping or ES sample ?
There is some mobo mfg that does not support B0 Xeon ie
Tyan mobo does not support Xeon B0 stepping