Windows SVR 2008 R2 Edition Comparison by Technical Specification

N/A: Not Available

Specification	Web	Standard	Enterprise	Datacenter	Itanium	Foundation	HPC
Cross-File Replication (DFS-R)	N/A	N/A	Available	Available	Available	N/A	N/A
Failover Cluster Nodes (Nodes)	N/A	N/A	16	16	8	N/A	N/A
Fault Tolerant Memory Sync	N/A	N/A	Available	Available	Available	N/A	N/A
Hot Add Memory	N/A	N/A	Available	Available	Available	N/A	N/A
Hot Add Processors	N/A	N/A	N/A	Available	Available	N/A	N/A
Hot Replace Memory	N/A	N/A	N/A	Available	Available	N/A	N/A
Hot Replace Processors	N/A	N/A	N/A	Available	Available	N/A	N/A
IA64 RAM	N/A	N/A	N/A	N/A	2 TB	N/A	N/A
IA64 Sockets	N/A	N/A	N/A	N/A	64	N/A	N/A
Network Access Connections (IAS)	N/A	50	Unlimited	Unlimited	2	10	N/A
Network Access Connections (RRAS)	N/A	250	Unlimited	Unlimited	N/A	50	250
Remote Desktop Admin Connections	2	2	2	2	2	2	2
Remote Desktop Services Gateway	N/A	250	Unlimited	Unlimited	N/A	50	N/A
Virtual Image Use Rights	Guest	Host + 1 VM	Host + 4 VM	Unlimited	Unlimited	N/A	Host + 1 VM
X64 RAM	32 GB	32 GB	2 TB	2 TB	N/A	8 GB	128 GB
X64 Sockets	4	4	8	64	N/A	1	4

http://www.microsoft.com/windowsserver2008/en/us/r2-compare-specs.aspx