Difference Between ESXi 5.0/5.1/5.5 and 6.0

Features	5.0	5.1	5.5	6.0
VM HW Version	8	9	10	11
vCPU	32 vCPUs	64 vCPUs	64 vCPUs	128 vCPUs
VM Memory	1 TB	1 TB	1 TB	4 TB
Graphics Support	SW based 3D Graphics	HW Based 3D Graphics	Improved 3D graphics support	WDDM 1.1 GDI graphics acceleration
Cluster Nodes	32 Nodes	32 Nodes	32 Nodes	64 Nodes
VM's per cluster	3000	4000	4000	8000
Max CPU per Host	160	160	320	480
Max mem per Host	2 TB	2 TB	4 TB	12 TB
Max vCPU per FT VM	1 vCPU	1 vCPU	1 vCPU	4 vCPU
VCSA with Embedded database	5 Hosts and 50 VMs	5 Hosts and 50 VM's	300 Hosts and 1000 VM's	1000 Hosts and 10000 VM's
Content Library	NA	NA	NA	Yes
VSAN	N/A	N/A	VSAN 5.5	VSAN 6.0
VSAN  Scale			32 Nodes	64 Nodes
All-Flash VSAN			No	Yes
VSAN Fault Domains			No	Yes
vMotion Enhancements	vMotion Supported	vMotion without shared storage	vMotion without shared storage Long Distance vMotion (10 ms  RTTs)	vMotion access vCenters                            vMotion access virtual switches                                  Long Distance vMotion (100+ ms RTTs)
Virtual Volumes	NA	NA	NA	Available with vSphere 6.0
NFS Support	NFS v3	NFS v3	NFS v3	NFS 4.1 supports Multipathing and kerberos Authentication
vCenter Single-Sign-On	NA	Introduced with 5.1	SSO with improved Architecture	SSO included as part of Platform Services Controller
FT Supported Disk Types			Eager-Zeroed	Lazy-Zeroed, Eager Zeroed and Thin Provision
FT Supported Features			HA, DPM, SRM, VDS	HA, DPM, SRM, VDS, Hot Configuration FT, H/W Virtualization, Snapshot, Paravirtual Devices, Storage Redundancy
VMFS Version			5.60	5.61