A recent survey conducted by Steam suggests that both NVIDIA and Intel are still dominant among Steam users.
The Steam survey has gathered data from October 2014 till March 2016, and the information collected is used to make "decisions about what kinds of technology investments to make and products to offer".
Please note that the data collected is based on Steam users who participated in this month's survey.
From the stats provided, it's clear that NVIDIA is still dominant on the GPU market - 56.35% of the Steam users in the survey are using a GPU from NVDIA. 25.5% of those in the survey are using an AMD GPU, while 17.77% is using an Integrated GPU from Intel. Between November 2015 and March 2016, NVIDIA managed to increase its amount of users by roughly 0.35%, while AMD lost around 0.5%.
Intel remained dominant in the CPU market for Steam users. In March 2016, 76.53% of the participating Steam users preferred an Intel CPU over an AMD CPU - a slight increase since November 2015. A small decrease in AMD CPU's can be witnessed between November 2015 and March 2016 with AMD having a 23.74% share.
Also interesting to note is that most Steam users in the survey, seem to be using a DX12GPU in combination with a Windows version pre-Windows 10. Microsoft's 64 bit version of Windows is the most used OS among those in the survey, followed closely by Windows 7 64 bit. Between November 2015 and March 2016, the amount of Windows 10 64 bit users grew by more than 8%, while the amount of Windows 7 64 bit users dropped by almost 3%.