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Someone explain why Vsync is bad for me

post #1 of 10
Thread Starter 
hey guys,

so i have been researching monitors for a few weeks now. i have a new awesome setup with a gtx 680 on the way. i've read and researched countless threads about IPS, TN panels, 60hz and 120hz. at this moment 120hz monitors are quite pricy. i understand that if you have a setup that can run over 60hz it is advisable to get a 120hz monitor especially for gaming (i play A LOT of bf3). i want to buy a 120hz monitor but they are very pricy especially as i want a 27". (i borrowed a 25" from my dad and its okay, so a 27" monitor is a trait that is non negotiable with me that i LOVE and need to have)

my question is i can save a lot of money if i just buy a nice 1080p asus 27", but is the 60hz going to hurt me? right now i am using a laptop and playing bf3 around ~30fps probably lower when it gets crazy, but i still do pretty well. and don't really notice poor gameplay as i have probably just gotten used to it. i don't like tearing at all as it really annoys me as i play, so would vsync really be that bad for me? why is it that bad that people hate it? so should i just really pay the cash in order to maximize my new rig and not deal with vsync at all?
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post #2 of 10
VSync hurts performance. With 30FPS you won't notice a gameplay difference between 60hz and 120hz.
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post #3 of 10
if you can easily keep your minimum frame rate above 60 fps(or 120fps on a 120MHz refresh rate); VSync will not hurt anything (frame rate wise). However if you have a dip below 60fps then having Vsync on will make what ever minimum frame you have lower. VSync will eat up a little bit of performance.

I am only on a 60Mhz so I have it on pretty much everything unless I have minimums under 60...I don't really start to notice tearing until I hit about 80fps So if I can turn up the settings to keep me in the 70's or below I will do so.

I hate tearing...really hate it. So VSync is a must for me.
Edited by Vagrant Storm - 9/11/12 at 10:18am
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post #4 of 10

On a basic level, what VSync does is keep your framerate that will create less screen tear.  Essentially, it limits the number of frames rendered so that it lines up with your monitor refresh rate.  So let's say your framerate is at about 47 FPS, VSync will limit it down to 45 too reduce screen tear, or if you get about 31 - 38 FPS, VSync would limit you down to 30 FPS.

 

You will notice a little less GPU usage at this point, but the screen tear reduction is normally worth it.

 

On the other hand though, VSync can hurt input lag in some games.

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post #5 of 10
In addition to all that Vsink will also limit fps to a max of 60, so even if your CPU/Video Card(s) can push more frames, it will be limited to 60fps.
 
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by Gunderman456 View Post

In addition to all that Vsink will also limit fps to a max of 60, so even if your CPU/Video Card(s) can push more frames, it will be limited to 60fps.

so would that mean that my gtx 680 along with a 3770k rig would be overkill? benchmarks for 1080p with all ultra and AA on show ~80fps for bf3. would it be beneficial for me to get 120hz for that or should i just stick with a 60hz and use vsync if it has screen tear? if its pushing more frames than what is needed, does that mean it is wasting the GPU? so would getting a 680 at this point be overkill then?

Quote:
Originally Posted by axipher View Post

On a basic level, what VSync does is keep your framerate that will create less screen tear.  Essentially, it limits the number of frames rendered so that it lines up with your monitor refresh rate.  So let's say your framerate is at about 47 FPS, VSync will limit it down to 45 too reduce screen tear, or if you get about 31 - 38 FPS, VSync would limit you down to 30 FPS.

You will notice a little less GPU usage at this point, but the screen tear reduction is normally worth it.

On the other hand though, VSync can hurt input lag in some games.

what is input lag?
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post #7 of 10
Depends on what setting you use in game. The hardware you have should get you at least 60fps in most games at high setting at 1080p, but not in all. Even if you hit 60fps and the monitor can only display those frames, the gaming experience higher then 60fps will be smoother and your responses to situations will be quicker. So even on a 60Hz monitor, the more fps the better.

Most would argue that they not only want to feel the smoothness of a game but also see it, so they are slowly transitioning to 120Hz monitors.
 
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post #8 of 10
Quote:
Originally Posted by frankietown View Post

Quote:
Originally Posted by Gunderman456 View Post

In addition to all that Vsink will also limit fps to a max of 60, so even if your CPU/Video Card(s) can push more frames, it will be limited to 60fps.

so would that mean that my gtx 680 along with a 3770k rig would be overkill? benchmarks for 1080p with all ultra and AA on show ~80fps for bf3. would it be beneficial for me to get 120hz for that or should i just stick with a 60hz and use vsync if it has screen tear? if its pushing more frames than what is needed, does that mean it is wasting the GPU? so would getting a 680 at this point be overkill then?

Quote:
Originally Posted by axipher View Post

On a basic level, what VSync does is keep your framerate that will create less screen tear.  Essentially, it limits the number of frames rendered so that it lines up with your monitor refresh rate.  So let's say your framerate is at about 47 FPS, VSync will limit it down to 45 too reduce screen tear, or if you get about 31 - 38 FPS, VSync would limit you down to 30 FPS.

You will notice a little less GPU usage at this point, but the screen tear reduction is normally worth it.

On the other hand though, VSync can hurt input lag in some games.

what is input lag?

 

In some game engines, input from the mouse, keyboard, other input devices, etc. are collected before generating the frame.  Most games are pretty good for being able to separate the input processing to another thread separate from the frame rendering, but sometimes that's not perfect.

 

Having a lower frame rate creates a lower polling rate.

 

As a very basic example, someone with 120+ FPS compared to someone VSync locked at 30 FPS would see next to no input lag since the frames are being processed faster than the program is polling for input.  On the other hand, someone with only 30 FPS might notice that their mouse and keyboard actions aren't being polled as fast as they would like because of VSync taking up a portion of the processing to extend the time it takes to render a frame so it lines up with a frame rate that is easily synced with the monitor.

 

To break it down just a little, again this is a really basic look at it, going from even 60 FPS to 30 FPS, you are going from a frame time of ~17 milliseconds to ~33 milliseconds.  Now of course some of that is spent doing CPU stuff, then network stuff, GPU rendering, and of course, input processing.  By reducing the FPS, you are increasing the time between input processing to a point that starts to become noticeable to some gamers.

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post #9 of 10
Quote:
Originally Posted by frankietown View Post

so would that mean that my gtx 680 along with a 3770k rig would be overkill? benchmarks for 1080p with all ultra and AA on show ~80fps for bf3. would it be beneficial for me to get 120hz for that or should i just stick with a 60hz and use vsync if it has screen tear? if its pushing more frames than what is needed, does that mean it is wasting the GPU? so would getting a 680 at this point be overkill then?
what is input lag?

I have used a 120MHz monitor and I really want one...it is definitely better. However, I not "enough better" to warrant trading in a perfectly good 60MHz monitor for one. If my monitor dies though...I would not get anything but a 120MHz. I don't care what it cost.

And yeah if you are getting more than 60fps continuously it could be viewed as over kill, but you can also turn the AA up higher to make things harder for the GPU(and this is OCN...no such thing as overkill). I typically find what ever settings will get me around 70fps consistently and run it. If it is a older game and I am maxing out and still over 70fps, then I use VSync. The screen tear isn't really that apparent until about that fps, but when I get a line moving across my screen it just drives me nuts.

Input lag happens in some games with VSync or at least is more noticeable in some. Basically your mouse might have a fraction of a second delay.
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post #10 of 10
Vsync makes my reactions in FPS games equivalent to a 95 year old grandma equipped with a spoon. Input lag like I'm controlling the Mars rover.

I've never understood or perceived screen tearing.
    
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Overclock.net › Forums › Components › Monitors and Displays › Someone explain why Vsync is bad for me