WoW’s Back End: 10 Data Centers, 75,000 Cores « Data Center Knowledge

# 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 13,250 server blades, 75,000 CPU cores, and 112.5 terabytes of blade RAM.
# The Blizzard network is managed by a staff of 68 people.
(Link: WoW’s Back End: 10 Data Centers, 75,000 Cores « Data Center Knowledge)