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hello! these days I'm trying to evaluate whether to buy a tv (example q90t or lg cx) or a monitor, to play in 4k at 120 with the new 3080.
I'm noob, please help

I'll play a little bit of everything, so the fps can vary from 50/60 to 110/120.
So, if I understand correctly, given the difference in fps compared to the refresh rate, if I don't want tearing, I need VRR.
But a tv like the q90t has no gsync module, so no variable overdrive.
Correct?

At what frequency does the static overdrive of a monitor / tv work? usually at maximum refresh?
So if the overdrive runs at 120hz and I play a game at 70/80fps in VRR, do I risk ghosting effects?

maybe I said a lot of bullshit, I don't know

Clyongar wrote: ↑

22 Sep 2020, 20:25

So, if I understand correctly, given the difference in fps compared to the refresh rate, if I don't want tearing, I need VRR.

Or VSYNC ON. There's a bunch of low-latency methods of VSYNC ON such as RTSS Scanline Sync or the Low-Lag VSYNC HOWTO.

Clyongar wrote: ↑

22 Sep 2020, 20:25

At what frequency does the static overdrive of a monitor / tv work? usually at maximum refresh?

Overdrive occurs once per refresh cycle, regardless of VRR or non-VRR.

When I say "fixed-Hz overdrive on VRR display", I actually meant "Overdrive normally optimized for a fixed-Hz screen but used for VRR". Even though overdrive is always permanently connected to the display refreshing behavior, since it's done as a per-refresh-cycle processing step.

Variable ghosting effects occurs when you use overdrive algorithms originally optimized for fixed-Hz screens. What was good overdrive for 120Hz can look bad at 60Hz (extra ghosting) and 240Hz (extra coronas). Because VRR changes refresh rate to match frame rate in realtime (refresh rate can change a hundred times per second!), you essentially have variable amounts of ghosting depending on what frame rate you are currently running at.

Now, if you want to less visible tearing without VRR, you can use highest-Hz (120Hz has less visible tearing than 60Hz for a given framerate, and 240Hz has even less visible tearing for a given framerate), or use VSYNC ON technologies to avoid tearing and simply optimize their latencies (if you hate VSYNC ON because of lag).

thanks for the answer

but if I play a game with vsync, with a 120hz panel, below 120 fps, I would still have tearing. no?

from your guide:

If your GPU is not fast enough to run at full frame rate during VSYNC ON,
…try a lower refresh rate
…adjust game detail/AA
…switch to a G-SYNC monitor or FreeSync monitor
…and/or upgrade your GPU.

so I should set the monitor to 60hz for heavier games and raise it to 120hz for lighter ones

Clyongar wrote: ↑

23 Sep 2020, 07:21

thanks for the answer

but if I play a game with vsync, with a 120hz panel, below 120 fps, I would still have tearing. no?

No. Tearing has nothing to do with refresh rate or FPS. Regardless of what your FPS is, vsync means each frame will always be displayed in whole. You still get stutter, but no tearing.

Without vsync, you get tearing and stutter.
With vsync you get stutter but no tearing, but input lag is increased.
VRR eliminates both tearing and stutter when FPS doesn't match Hz, and without increasing input lag as long as you make sure your FPS stays below Hz.