Windows Server 2008 Datacenter Edition

Designed for

• Environments with mission-critical applications
• Very large databases
• Information access requiring high availability

Support for clustering with up to 16 computers
For SMP it supports from 2 to 64 processors.
Feature
Hot add memory and fault tolerance memory sync
RAM capability

RAM
a max of 64GB
Similar to to enterprise
64GB for x86 processor and 2TB for x64 bit processor.