ESX 4.1 supports 128 logical processors, not 64
Hello TPM, allow me to point out that the information about ESX 4.1 keeping the 64 logical processors support for the host machine is not correct.
The hypervisor 4.1 release include, among other features, the support for 128 logical processors and specifically the Intel 7500 processor family. Check the links bellow for more details:
ESX 4.1 configuration maximum (page 2):
VMWare 4.1 "What's New":