Intel thoroughly missing the point here
These are not credible competitors to four-socket Opteron boxes, because they're so enormously more expensive; even if you regard a Sandy Bridge hyperthread as equivalent to an Opteron core, $1611 for eight 2.2GHz SB cores versus $639 for sixteen 2.2GHz cores is a big premium.
The four-socket Opteron boxes are great for HPC-like jobs, my 4x6168 machine delivers 360GFLOP peak for about 700 watts and I've not had to fiddle around with Infiniband cards and switches to connect smaller boxes together.