Unreal Engine 4, etc.

[=;8053]
“high end PC’s” is extremely vague, not to mention they said it’s just an estimate. It’s extremely difficult to try and say how many people are PC gamers, there’s not really any way to classify it.
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This doesn’t give a for-sure answer, but hits on some great points when trying to determine the number of PC gamers.

http://software.intel.com/en-us/blogs/2009/03/03/just-how-many-pc-gamers-are-there