Originally Posted by SeeThruHead
Not to be confused with adaptive vsync that turns v-sync off completely under 60fps. This tech actually updates the screen as soon as each frame is rendered. and it should be tear free at all fps. even below 30 it will just start double the frames to achieve tear free frames.
Mostly right....Sounds like you're agreeing with me.
One correction on what you said... This reverts to normal Vsync behavior above 120fps and below 30fps.
So sub 30 and it will still stutter like normal Vsync. But below 30fps it's not playable anyway so it doesn't matter.
The reason is that it can't go above 120fps is because the display can only refresh so fast, no matter how fast the rendering can go. The reason it can't work below 30fps is that LCD pixel tech requires that the pixels be refreshed every so often at the electrical signal level.. Otherwise they start to lose the color they're holding and you get weird non uniform pixel artifacts as they independently fade from the desired color.
If you're below 30fps and using gsync, that means you're asking the LCD monitor to hold its current pixel colors and keep delaying rescanning the GPU output past 33ms. At this point the display LCD pixels can't hold the pixel color anymore and absolutely has to be refreshed... Meaning it starts the vertical retrace on its own, which then prevents the GPU from flipping the frame it's rendering until it's done (because you don't want tearing), even if the GPU was ready to flip many ms ago... I.e. Normal Vsync.Edited by Seven7h - 10/18/13 at 3:49pm