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VMware vSphere 5.1 vs. vSphere 5.5

This site explains the key differences between vSphere 5.1 and vSphere 5.5. An overview comparison from all vSphere Versions is available here.

vSphere 5.1vSphere 5.5
ReleasedSeptember 2012September 2013
Physical CPUs per host160320
Physical RAM per host2 TB4 TB
vCPU per VM6464
vMEM per VM1 TB1 TB
VM Hardware Version910
VMFS Version5.585.60
Free ESXi Memory Limit32 GBunlimited
Single Sign-OnSSO 1.0 built on identity management by RSASSO 5.5 completely rewritten from the ground up. Supports a multi-master model
vSphere Flash Read CacheNOYES
Reliable Memory TechnologyNOYES
vSphere Big Data ExtensionsNOYES
vSphere App HANOYES
40GBps NIC SupportNOYES
Windows 2012 Cluster SupportNOYES
vSphere ReplicationOnly one copy of a VMUp to 24 replicas
vCSA Scale (vPostgres)5 Hosts
50 VMs
100 Hosts
3000 VMs

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