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VSYNC is buggy / not working properly in Y500 under Windows 8.1

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So the problem is that VSYNC option in all my games is working totally different in Windows 7 and 8.1.

In Windows 7 it working like it should be - limiting frame rate to the screen refresh rate (60Hz in my case).

But in Windows 8.1 its limiting GPU usage and randomly cuts frames to 40 or 48 for instance, instead of 50 or 55 with 99-100% GPU usage.

Here's the GPU usage graph:

post-22997-14494998014311_thumb.jpg

Left part of the graph with VSYNC on, right with VSYNC off.

Single render mode doesnt change anything.

GAMES: Sniper Elite III, Blackguards, Fallout 3 and The Incredible Adventures of Van Helsing.

Can please somebody with the same machine confirm that this is an actual thing?

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I have the exact same problem, but i usually don't use the in game vsync at all. I would recommend you use either the adaptable v-sync from the nvidia controlpanel, and make sure you have your program settings low enough so you can use the program with 60fps. Otherwise i would adwise to use user.ini files and apply console commands for limiting fps to your monitor refresh rate. i have found out that most of the inprogram vsyncs sync your fps to the maximum you can handle constantly. hope this helps.

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