Difference between ESX 3.5 and ESX 4.0

 Here is the Post with the Difference between ESX 3.5 & ESX 4. I believe this would be the one of the definite questions in interview. Will working towards to bring the differences between all editions of ESX version.

If you looking for Difference between vSphere 4.1 and vSphere 5. Please refer my blogpost on “Difference between vSphere 4.1 and vSphere 5″

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Features
ESX 3.5
ESX 4
Linked Mode
No Linked Mode Support
Linked Mode Supportis introduced in vSphere 4.0
Host Profiles
No Host Profiles
Host Profiles is Introduced in vSphere 4.0
Centralized License
Require dedicated License server
License can be managed within vCenter server
Performance chart
Yes
Lot More enhancements
Events and Alarms
Yes
Lot More enhancements
Fault tolerance
Not Available
Available from vSphere 4.0
Storage VMotion
SVMotion available only with CLI
SVMotion available in GUI
VMotion
Yes
Yes
Virtual CPUs per host
192
512
Virtual Machines per host
170
320
Logical processors per host
32
64
RAM per host
256 GB
1 TB
Maximum Service console Memory
800 MB
800 MB
DRS
Yes
Yes
VMware Data Recovery
Backup using VCB (VMware Consolidated backup)
VMware Data Recovery and VCB support
Enhanced VMotion Compatibility  (EVC)
No EVC
EVC is introduced in vSphere 4.0
VMware HA Admission Control
Yes but without options to reserve  failover capacity
Admission Control is improved to provide more flexible configuration options to reserve failover capacity.
High Availability Clustering with Windows Server 2000, 2003, 2008
Not Available
Available  in vSphere 4.0
Serial Attached SCSI (SAS)
Not Available
Available to support MSCS on win 2008
Hosts per storage volume
32
64
Fiber Channel paths to LUN
32
16
NFS Datastores
32
64
Hardware iSCSI initiators per host
2
4
Virtual Machine Hot Add Support
NO
Yes
Number of virtual CPUs per  virtual machine
4
8
 Virtual Hardware version
4
7
RAM per virtual machine
64 GB
255 GB
 virtual machine swap file Size
65532MB
255GB
VMDirectPath for Virtual Machines
NO
Yes
 Vmkernel
32 Bit
64 bit
Service Console
32 Bit
64 bit
Concurrent remote console sessions
10
40
Virtual Disk Thin Provisioning
No Thin Provisioning
Thin Provisioning introduced in vSphere 4.0
VMware Paravirtualized SCSI (PVSCSI
Not available
High-performance storage adapters that offer greater throughput and lower CPU utilization for virtual machines
Hot Extend for Virtual Disks
Only Via VCLI using vmkfstools
Available via GUI
Hot plug support for virtual devices
No
Yes
VMXNET Generation 3
Not Available
Yes
vNetwork Distributed Switch
Not Available
Available from vSphere with Enterprise Plus License
Private VLAN Support
Not Available
Available  with DVSwitch
Network Vmotion
Not Available
Available with DVSwitch
3rd Party Distributed Switch Support
Not Available
We can use Cisco Nexus 1000v with DVSwitch
IPv6 Support
Yes
Yes
NICs per VM
4
10
Standard vSwitches per host
127
248
Virtual NICs per standard vSwitch
1016
4088
8 way SMP
No Only 4 way
Yes
Update Manager
Yes
Yes
DPM
Experimental
Fully supported with PMI and iLO Remote Power On
License Types
VMware Infrastructure Foundation VMware Infrastructure Standard VMware Infrastructure Enterprise
vSphere  Essentials vSphere Essentials Plus vSphere  Standard vSphere Advanced vSphere Enterprise vSphere Enterprise Plus