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So the Steam data for September is available: http://store.steampowered.com/hwsurvey/

Almost every 4th Steam-user already switched to Windows 10.

24% have installed the 64-bit-version, 0.88% the 32-bit-version (probably windows tablets). 

80.42% of the GPUs are DX11-compatible. Additional to the usual DX11-, DX10-, DX9-rankings there is an additional list with all GPUs... probably the preparations for the switch necessary due to DX12.

What's nice in the new list: GPUs over 0.15% get counted (in the DX11-list GPUs under 0.30% doesn't get counted), so more data! Nevertheless none of these cards has already reached 0.15% of the Steam users: R7-300-series, R9-300-series, R9-Fury-series, GTX 950, GTX 980 Ti or GTX Titan X.

What's not so nice in the "all GPUs"-list: only data for May, June and September. So I multiplied the DX11-percentages of the other months with the respective DX11-share of each month (f.e. the GTX970 in August: 3.97% * 79.65% = 3.16%) and the results fell in line almost perfectly:

The only inconsistency in the Steam data is the Intel HD 4000: it is much closer to the GTX 970 in the "all GPUs"-list and all other GPUs gain 0.0x% from that: