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Most of players don't have OpenGL 4.2.

You'll get hundreds of bug reports about game crashing on start.

Testing on old hardware (for <50 000 triangle games it's Intel GMA and Geforce 4 MX and some old Radeon) is a good way to be sure it works on most of computers. Of course game needs to support those old cards only on lowest quality settings.




Here's Valve's viewpoint on user configurations: http://store.steampowered.com/hwsurvey/videocard/

To understand a somewhat more casual audience, it's interesting to contrast the users of Unity: http://unity3d.com/webplayer/hwstats/pages/web-2012Q1-gfxcar...


The same is true for Direct3D.

If the user's GPU doesn't support D3D 11, you have to supply a fallback.


But that's just it: A fallback. Not totally separate codepaths for NVidia, ATI, etc, which is pretty much where legacy openGL is.




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