Sorry, but are you sure the new processor is Xeon X5 4600 v2 ? Cause I can found reference on HCL for E5 4600 v2:
And search on Google for "intel xeon X5 4600 v2" only show results for "intel xeon E5 4600 v2".
I'm just looking for motherboard support - for those of us who build our own systems.