two similarly sized 2P systems from HP: 48GB ram, 8x (300gb 15k SAS) ESX 4.0 is s/w but choice of AMD 6134 gives 16 cores vs Intel 5620's 8 cores. Both almost at same CPU Clock 2.4 GHz for VM workloads of medium size which is best bang for buck/perf? workloads : mostly Windows VM guests -- thx in adv
So you're talking DL385 G7 vs. DL380 G7 right?
The most important question you need to ask is if this is to be part of an existing or future DRS cluster - if so then the manufacturer needs to match across the cluster so that should override any speed gain or loss.
If you could ONLY buy one or the other of these two chips I'd go for the AMD, simply because 16 full cores (i.e. 2 x 8 in the 6134) will give you overall better performance than the 5620's 8 full cores plus hyperthreading - simply because not every task will make best use of threading. Plus the 385 has 24 DIMM sockets over the 380's 18. That said if I had a choice I'd go for the 12-core 6172 chips to be honest, their power-per-watt and price is pretty compelling.
Oh and the 6134 is 2.3Ghz by the way.
NB: - It's worth you knowing that I'm a known Intel advocate but I'm more than happy to recommend AMD here.