Even though Steam still isn't used by everyone, it does allow us to see a majority representation of the different pieces of hardware used by a large portion of the gaming community. It seems that the utility of Steam gives us the opportunity to delve deep into some interesting statistics.
To further add evidence to such a theory, the Intel HD 4000 is still the most popular GPU that's reported by Steam. It comprises 6.32% of the user-base, with the GTX 970 trailing at 3.85%. Again, that could mean that it's reported by all Sandy Bridge CPU's as being installed, but could also, again, the result people using laptops for gaming. Very curious, no?
And, just in case you were indeed wondering about the adoption of Windows 10. As of this particular Steam survey, Windows 10 64Bit enjoys a 2.31% install base among Steam users. Not bad considering that by the end of the month it had only been released officially for a few days.