WoW datacenter details

• Blizzard Online Network Services run in 10 data centers around the world, including facilities in Washington, California, Texas, Massachusetts, France, Germany, Sweden, South Korea, China, and Taiwan.
• Blizzard uses 20,000 systems and 1.3 petabytes of storage to power its gaming operations.
• WoW’s infrastructure includes 3,250 server blades, 75,000 CPU cores, and 112.5 terabytes of blade RAM.
• The Blizzard network is managed by a staff of 68 people.
• The company’s gaming infrastructure is monitored from a global network operating center (GNOC), which like many NOCs, features televisions tuned to the weather stations to track potential uptime threats across its data center footprint.

http://www.datacenterknowledge.com/archives/2009/11/25/wows-back-end-10-data-centers-75000-cores/