Hardware and firmware requirements

A minimum of two Dual-Core Dual CPUs (such as Xeon 51xx family, Xeon E53xx family, or X53xx family), 2 GHz or higher

One database server core for every two application server cores

4 GB for each server

Dual, redundant Intel NICs and power supplies

If using BroadCOM NICs, ensure that the latest drivers are installed. Disable the TCP Chimney feature as described in the following Microsoft article: 

http://support.microsoft.com/kb/951037

The installation procedure requires at least 20 GB free for data.

Disk space for storage on a RAID 5, RAID 0+1, or RAID 10 configured disk system. The exact allocation of disks depends on the hardware configuration.