It depends on the monitor. Different models use different timings. Usually, you get the best results when you run lower Hz but at high-Hz timings. This is sometimes called "accelerated scanout."knypol wrote:Hmm so if my monitor (pg258q) can strobe in 100, 120 and 144Hz the least amount of crosstalk i should see is on 100Hz? When i do ufo test i can clearly see a lot less crosstalk on 144 than 120 or 100...or i misunderstood smth?
What you do is use a custom 100Hz mode where you raise the VT (vertical total) of the mode until the pixel clock reaches the same value as the pixel clock you have at 144Hz (or even higher, if your monitor can still strobe.) The result of this is that you get a frame every 10ms (100Hz), but each frame takes 6.9ms to scan out (144Hz scanout speed,) not 10ms. This usually means the pixels at the bottom of the screen transition earlier to the new frame, and this reduces crosstalk because each strobe is still spaced 10ms apart, giving pixels more time to transition before they become visible.
This isn't 100% guaranteed though. Again, depends on the monitor. You can try though. Also note that some monitors will not allow this at all. Most do, however.
And a final note: Some monitors already do this accelerated scanout themselves when you choose a lower Hz. In these cases, you obviously are already getting the benefits of this trick and you don't need to customize the lower Hz modes. You can tell if this is the case or not in your monitor by comparing the pixel clocks of the lower Hz modes to the pixel clock of the highest Hz mode that supports strobing.