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A special request for JimBob1937

What you are seeing here is a side-by-side comparison with three different vsynced display modes selected as recorded offscreen at 960FPS.
From left to right we have 60Hz display refresh rate with vsync on and no limitations on max FPS set in software, in the center 40Hz vsynced video again no upper limit set in software and on the right we have 40Hz display refresh rate set with G-Sync enabled and again no upper limit set in software.

What you might notice is that the G-Sync enabled display refresh rate is updating at 40Hz while the other 40Hz mode is updating at what appears to be 60FPS just like the 60Hz side.

That's really strange isn't it?

What this shows: VRR's maximum framerate can be capped and this will change the display update rate to conform to any specified display refresh rate (in this case 40Hz). Setting G-Sync with a 40FPS cap will produce this effect, but setting the display to 40Hz and disabling G-Sync appears to allow the screen to run at a normal 60Hz.