While just under 10% of all PCs are currently using Windows 10, the tens of millions of PC gamers who sign up for Valve's Steam service have embraced Microsoft's latest OS at a faster rate. The latest numbers from Valve's voluntary hardware survey of its Steam audience, from December 2015, show that 64-bit version of Windows 10 is now being used by 31.25% of all Steam users.
That's nearly a 2.5% increase compared to November 2015 and puts that SKU in second place on the survey, just behind the 64-bit version of Windows 7 which is in first at 32.81%, down by 0.82% percent from December. Assuming the pace of Windows 10's increase continues, combined with the decrease in Windows 7 market share, it's possible that Windows 10 will hit the number one spot on Steam hardware survey with January or February's stats are revealed.
Combining the 64-bit and 32-bit versions of Windows 10 on the Steam hardware numbers show that 32.46% of gamers that use the service have some version of the OS installed on their PCs.