We just added a new Dell R620 server to our Cluster and noticed that the Passmark benchmarking tool reports very poor single threaded performance compared to our older PowerEdge 1950 hosts. The Passmark tool was run in a 2 vCPU MS Server 2008 R2 VM that was simply vmotioned between the two hosts to perform the before and after testing. The older hosts have x5460 Procs and the new R620 host has E5-2670 procs. When compared to other like passmark benchmarks the "Our-Results x5460" matches up pretty closely but the "Our-Results E5-2670" does not. What might be going on here? Why does the E5-2670 appear to do so poorly with single threaded calculations in my environment? Yet clearly outperform the X5460 in other's (likely non-VMWare) benchmarks?
See the attachment for the results. Again, I am mostly concerned with the singled threaded tests since that is the only one that losses significantly to the somewhat ancient X5460 proc in our environment.