Test build 2014-07-20

[NaN]

Fps is 60 for both, all I see in log is:
INFO: Current FPS: 59.2
or sometimes
INFO: Current FPS: 59.6
I didn't ever see any drop below 60 in game, so no difference between vdrift1 and vdrift.

60fps sounds like vsync to 60Hz by driver? You can verify it by reducing resolution/graphics settings. You should easily get over 60 fps.

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I think I have an idea about what is going on. We have a lot of small objects having few thousand vertices each. Nvidia might try to be extra clever and convert indices from 32 to 16 bit on each call. While AMD and Intel don't really care.

I'll upload a new build which uses glDrawElements instead, without providing range hints.