Poor single threaded with Sandy Bridge-EP and VMWare performance?

We have just added a new server Dell R620 to our Cluster and noticed that the Passmark benchmarking tool reports a very bad single threaded performance compared to our old host PowerEdge 1950. The tool of the pass mark was executed in a vCPU 2 MS Server 2008 R2 VM, which was simply vmotioned between two hosts to perform forward and after the test. Guests have x 5460 Procs and the new host r.620 E5-2670 procs. Compared to the other as the benchmark for our-results x 5460"passmark corresponds quite closely but the"our-results E5-2670 "does not work." What could be going on here? Why the E5-2670 seems to hurt so much with single thread calculations in my environment? Still clearly better than the X 5460 in landmarks on the other (probably not VMWare)?

See the attachment for the results. Yet once again, I am especially concerned by the distinguished threaded tests since it is the only losses significantly in the proc X 5460 a bit old in our environment.

A couple of scattered thoughts...

You have the latest version of the Dell BIOS for the r.620 (version 1.3.6)?  Have you tried to erase the NVRAM (i.e. installation by default in the BIOS loading)?

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