Quote from DannoXYZ:
The problem with Intel's multi-core design is that each core shares the same memory through the FSB. Yes, even two cores on the same die goes through the FSB to access memory.
With AMD's design, each CPU has its own memory bus and memory. On my 16-core machine, the 8th VM runs just as fast as the 1st one.
The TPC-C benchmark is the granddaddy for database system tests.
The link below filters by the number of processors and sorts by performance. At four processors the tests are dominated by Xeon systems, but once you go above 4 the list gets taken over by IBM Power, Itanium and PA-RISC architectures.
BTW, didn't see much in the way of AMD systems...
http://www.tpc.org/tpcc/results/tpc...ES=100+PERCENT&include_withdrawn_results=none