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You'll still get tearing with Fast Sync if your framerate is below your monitor's refresh rate. It operates without any syncing in that state. Above your monitor's refresh rate the video card is still rendering as fast as possible, but the driver is discarding frames before hitting the display so that it is only showing frames as quickly as the monitor refreshes. In short: if you don't want any tearing at all under your monitor's refresh rate then you still need to use V-Sync with triple buffering.First of all, if you set a global override in the control panel, shouldn't that override whatever the game is set to?
Second, it's not working like that. With Fast Sync enabled globally, in Black Ops 2 I get tons of lag if Vsync is enabled in-game, and tearing with no lag if Vsync is disabled in-game.
The way I understood it, you should leave VSync Off in the game settings. But now that I'm looking for official confirmation, it's hard to find. All I can see is a Reddit post from a few months ago, and my own experience playing with it. The lag with VSync On sounds right, as it should have the same amount of input lag as with standard VSync. However, I do wonder about tearing with VSync Off. I tried a number of games, and I did not notice any tearing with Fast Sync On and VSync Off. Can you try a game other than Black Ops 2?
Sorry, my original statement wasn't right. Fast Sync wasn't set globally like I had thought (maybe a driver update defaulted it back).
Diablo 3 used to crash in-game when changing the Vsync setting with Fast Sync enabled globally, but either Blizzard or Nvidia must have patched that since it no longer does. The reported framerate in the game changes based on the in-game Vsync checkbox, so it's still affecting something in spite of Fast Sync enabled globally. I need to do some more tests with more games.
If you want to use Fast Sync, then you enable it in the Nvidia Control Panel but inside the game settings VSync should be OFF.
You'll still get tearing with Fast Sync if your framerate is below your monitor's refresh rate. It operates without any syncing in that state. Above your monitor's refresh rate the video card is still rendering as fast as possible, but the driver is discarding frames before hitting the display so that it is only showing frames as quickly as the monitor refreshes. In short: if you don't want any tearing at all under your monitor's refresh rate then you still need to use V-Sync with triple buffering.
My initial assumption was that Fast Sync should function like VSync On when below refresh, but it was not exactly this. I recorded some slow-motion videos and Fast Sync definitely had erratic motion when frame-rates were close to refresh rate give or take. So there would be either a jump or a hitch every second or so. While playing, it appeared smooth to me, but looking at the recording afterwards it was clear the motion was irregular. At 90fps and higher, it did appear smooth. And once you got to around 200fps, you could really feel the difference in terms of reduced input lag and the experience was smooth.
Wait, doesn't anything below 60fps with Vsync or Fast Sync cause 30fps, since that's the next-fastest multiple of your monitor?
I don't have Overwatch or WoW to be able to test Fast set globally. Can anyone test that now? Since Diablo 3 now seems to honor the global setting, I wonder if nvidia might have changed something to fix it for all games.