According to the automatic survey by Valve Software, about 50.36% of Steam users have computers running Intel processors, whereas AMD-based systems are utilized by 49.64% of all 847 thousand of gamers who have Steam installed.
The vast majority of gamers – 87.39% - still have systems with one processing engine, however, already 12.56%, or about 106 thousand of users at press time, own a system that has two physical central processing units (CPUs), including those who have dual-processor machines as well as PCs based on dual-core microprocessors. About 0.05% of users – or 416 people – have a system with four cores, while 2 gamers are lucky enough to own a personal computer with 8 CPUs.
http://www.xbitlabs.com/news/cpu/display/20070118143553.html
While the conclusion of their survey is undeniable... i question whether these numbers are conclusive for all gamers. I suspect the number of dual core users is higher across the board.
What do ya'll think?
EDIT: I added a poll