How much input lag does vsync add?

I know and I can feel that vsync adds to input lag in different games. For example I play FIFA alot and I can clearly tell the difference between vsync on and off. But how does vsync work? And how many milliseconds does it add to input lag? I have searched and found people asking about vsync on different forums but have never got a good explanation to why it causes input lag and how much lag does it add.

Totally depends on the game. Some have more lag and others less.

I always turn Vsync OFF unless there's major screen tearing that I can't stand.

Not much, but if you have Nvidia GPU (gsync) and a proper gaming gsync monitor with 100+Hz you'd be good to go.

I concur.

Depends on the monitor refresh rate, but at 60Hz it is about 18ms for triple buffering, less for double. That assumes that the game is doing it properly though, which is not always the case. I can't deal with screen tearing so I always use vsync. Some games like anything on the Source engine it isn't perceivable, other engines it is.

I can't stand vsync personally. Always turn it off.

Depends on the FPS. At 1,000 FPS you will be rendering every 1ms. At 60 FPS you'll be rendering at 16.6ms.

Can't stand Vsync, always turn it off. Unless screen tearing on the specific game is even more annoying, then I bear with it.

A lot. At 60Hz it makes shooters unplayable for me. At 120Hz it's not as bad. This is why I can't use IPS =C

I always have it on, I get screen tearing a lot

I turn Vsync OFF and I use 62fps limit that give me very minimal tearing without any input lag.

The input lag on vsync is extremely noticeable.

I varies but it's vastly more acceptable than screen-tear. I nearly always use adaptive V-Sync and it does it's job reasonably well most of the time (although sometimes you have to fiddle with settings some more).

I experienced it only on Valve games.

I think it varies depending on the game. I never use it, but one time I enabled it in CS:GO and the input lag was extremely noticeable.

A lot same with it turned off I get a lot of tearing, I cant win. Trying to look around for cheapish 100hz 22" monitor or TV at 1080p.

Same here, but I hate screen-tearing much, much more.

I miss D3DOverrider, but the author stopped supporting it a long time ago. It works with some older last-gen games, but not for all of them. D3DOverrider still had input lag, but it was less than Nvidia panel vsync or the game application's vsync which is unpredictable.

i use v-sync whenever i can as long as it doesn't make things run bad. Most games run fine and theres no extra lag on them. Only one recently I noticed that vsync made run worse and increased my input lag was Middle Earth Shadow of Mordor, but this was mostly due to my video card barely able to keep fps at 60 fps to begin with.

Pretty much two reasons i use vsync. One is to stop screen tearing, and the other is to save power since theres usually no point going beyond the 60 fps since my monitors only 60hz. If i play a game on my plasma tv i almost always have to vsync, i seem to get a lot more noticable tearing on that then i do my pc monitor.

And if your barely hitting 60 fps you may not want to use it in those cases, I had times when i was around 45-55fps and it would then lock fps down to 30 fps for some games, pretty awful when it does that.

What about turning on v sync on both game and graphic card?.

It's actually not noticeable if you're playing a game with a controller and V-sync on. It's a lot more noticeable with a mouse due to its sensitive nature. I rarely notice screen-tearing so I usually don't care to ever turn it on.

@KHAndAnime:

+1 that I get terrible lag with mouse but not controller. Also in some games on vsync gpu there are 3 or more modes 1,2,3. Is there more slow down the higher the option?.