Not quite wishing to jump into the AMD vs. Intel debate at this point but I really have to question the validity of the benchmarks posted in that link. Many of these have the Westmere Xeons outperforming the SB-E, IB-E, and even HW-E, I've simply never seen this in any benchmarks I've ran on my personal systems and it just doesn't logically make sense.
Dont panic, your set up is still much better...
They surely used dual socket set ups like in the linked 2687W review.
http://techreport.com/review/19196/intel-xeon-5600-processors/2Our mash-up results come from several generations of CPU test suites, dating back to our Xeon X5680 review