According to data from Valve's Steam Hardware and Software Survey for the month ending October 2014, Microsoft's latest operating system usage (if you ignore Windows 10 Technical Preview) has increased to a combined total of 29.68% (up from the previous month's 28.96%) for both Windows 8 and Windows 8.1. This factors in both 32bit and 64bit of Windows 8 and Windows 8.1.
This data is collected by Valve's Steam game client, for those that did not know, and measures hardware and software stats on a monthly basis. This data indicates how much share an operating system has (among other stats) when it comes to gaming via Steam.
According to the data, Windows 8 32bit accounts for a 0.41% share (a decrease of 0.02% compared to the previous month) while Windows 8 64bit saw a decrease of 0.77% for a total share of 7.09%. Windows 8 32bit and 64bit saw a combined share of 7.5%.
Windows 8.1, on the other hand, saw a share of 0.58% (an increase of 0.07%) for the 32bit version of the operating system, while the 64bit version saw a share of 21.60% (an increase of 2.59%). Windows 8.1 32bit and 64bit saw a combined share of 22.18%. Clearly Windows 8.1 64bit is the preferred choice for Steam gamers.
Windows 7 32bit continues to decline in share with a total share of 11.61%. Windows 7 64bit still has the most market share with 47.53% (a slight decline of 0.55% compared to the previous month). Interestingly enough, Mac OS 10.9.5 (OS X Mavericks) 64bit saw an increase in market share to 1.48% (an increase of 1.48%!). Windows 10 has yet to make an appearance in the survey.
You can check out the stats at the via link below. Which operating system do you utilize for gaming?