vsync framerates

[vazel]

Sorry if this is stupid I figure I might as well just finally ask it. Something that's always bugged me about vsync is we're told that when framerate dips it halves. So if you go below 60fps you'll get 30fps. But then how come when I run OSD programs I see framerates of 40fps, 38fps, etc. Shouldn't I just see 60/30/15?

[zanzabar]

vsynk holds frames until they match a frame thats sent, so if u have a 60hz monitor and have 60fps u get 1 frame per frame thats sent to the monitor, if u get say 30 then it will send a frame then duplicate it then send the next. if u were at say 45fps then it would send a fram, send a frame then duplicate then send it.

u can have half or quarter modes depending on what your expected frames are like consoles that normaly run 30, but its all the same.

[vazel]

From reading around I think I get it now. It's just explanations from guys like this have always confused me. http://www.brighthub.com/computing/h...les/27719.aspx

Edit: Excellent explanation right here I understand it better. I guess the other fps readings I was getting was because triple buffering is automatically enabled with vsync in tf2. http://hardforum.com/showpost.php?p=...11&postcount=1

[STEvil]

if you have a stable enough framerate its better to disable vsync. Using vsync creates display and input latency.

[zanzabar]

if you have a stable enough framerate its better to disable vsync. Using vsync creates display and input latency.

or i find it better to cap the frames if u have a bad lcd as thats the only time u would want vsync to start with

especially on source

[Kingcarcas]

In online yes, but offline i put vsync on

[vazel]

Ugh you see this is what I don't get. According to that hardocp post the only framerates I should get with vsync are 60, 30, 20, 15, 12, 10, and so forth. Yet here in l4D1 with double buffered vsync I'm getting 45fps.

[STEvil]

I dont see a reason why you couldnt get 45. Its not a multiple of 60 but there's no reason you cant take every x frame produced to output a couple points other than multiples of 60.