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Vsync threshold

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Hi all-

Unlimited w/vsync works pretty well for me under certain circumstances as a frame rate limiter. I was wondering how the threshold is determined  that will drive vsync down to half refresh rate (which in my setup is 60hz).

I'll see it fluctuate between 60 and about 42-44 depending on load and then it will snap to 30 which is the sweet spot on my rig. It can go the other way as well.

So, is the break at an average between 60/30 or is there a time component involved, or is it load?



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