Is there any way to unlimit refresh rate from 60 Hz?

jiancaiyang

I tried some Qt example: cube and openglwindow, and unfortunely found they all report 60 Hz refresh rate on my Windows 10 tablet.
I wonder if I could unlimit the refresh rate from 60Hz on Windows platform, or other platfom?

jsulm

@jiancaiyang This is a hardware/driver thing. How is it related to Qt? You can check Windows settings to see whether it is possible to change the refresh rate.

jiancaiyang

@jsulm A little bit complicated, say I've found Qt + Bullet behaves slower than Bullet examples. So I need to check if we limit the fresh rate to slower the simulation.

jiancaiyang

How can we think a new way to render more than 60FPS in spite of the device's limitation?

ambershark

@jiancaiyang If you disable vertical sync (vsync) on your tablet (not sure how or if this is possible in a tablet environment) then you should be able to go over the refresh limit of the screen.

Just throwing that out there, not really sure if there's even options for that on a tablet.

On a PC with a 3D card it's quite easy though (at least with NVIDIA control panel).

jsulm

@jiancaiyang One note to what @ambershark said: even if you disable vsync - your display will still be refreshed at 60Hz. The only differenz will be that you can render at higher speed, but the speed of the display will not change.

ambershark

@jsulm said in Is there any way to unlimit refresh rate from 60 Hz?:

@jiancaiyang One note to what @ambershark said: even if you disable vsync - your display will still be refreshed at 60Hz. The only differenz will be that you can render at higher speed, but the speed of the display will not change.

This is what causes screen tearing in 3D applications that render over the refresh rate of the monitor as well. It's the whole reason vsync exists. :)

jiancaiyang

@ambershark Thanks, V-Sync is necessary, however, as of displaying FPS, We need to give users a hint that the performance is good which in fact due to V-Sync users could only get the animation on certain refresh rate. screenshot

ambershark

@jiancaiyang For me when I'm playing games, I just look to see if my FPS is near 60. If it is since that is my refresh rate then I know my performance is quite good.

I'm pretty comfortable all the way down to about 35 fps though. If it dips below that I start to notice it. I have a GTX 970 so I can run most things on max settings without going below 30 though.