Motion clarity question

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kurtdh
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Motion clarity question

Post by kurtdh » 01 Jul 2024, 14:21

I understand how a higher hz gives you better motion clarity, but does actual FPS factor into this? For example, will motion clarity be the same in both scenarios?

#1. 240 fps at 240 hz
#2. 60 fps at 240 hz

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RealNC
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Re: Motion clarity question

Post by RealNC » 02 Jul 2024, 08:00

Hz alone or FPS alone won't improve clarity. You need both. 60FPS@240Hz will have the same clarity as 60FPS@60Hz and 240FPS@60Hz (except minor differences due to possible pixel response time differences.)

Higher Hz though does give a latency benefit even at lower FPS due to higher frame scanout speed (and you can also get that higher scanout speed through QFT or VRR.)
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kurtdh
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Re: Motion clarity question

Post by kurtdh » 02 Jul 2024, 22:08

RealNC wrote:
02 Jul 2024, 08:00
Hz alone or FPS alone won't improve clarity. You need both. 60FPS@240Hz will have the same clarity as 60FPS@60Hz and 240FPS@60Hz (except minor differences due to possible pixel response time differences.)

Higher Hz though does give a latency benefit even at lower FPS due to higher frame scanout speed (and you can also get that higher scanout speed through QFT or VRR.)
Thanks for the answer! So if I can only get 60 fps in a particular game, a 240hz monitor will literally have the same motion clarity than if I had a 60hz monitor correct?

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Re: Motion clarity question

Post by RealNC » 03 Jul 2024, 08:32

kurtdh wrote:
02 Jul 2024, 22:08
Thanks for the answer! So if I can only get 60 fps in a particular game, a 240hz monitor will literally have the same motion clarity than if I had a 60hz monitor correct?
There could be some difference because of the different monitors. But on the same monitor, it would be the same, unless the monitor has a really bad 60Hz mode overdrive.
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Re: Motion clarity question

Post by Chief Blur Buster » 05 Jul 2024, 19:48

kurtdh wrote:
02 Jul 2024, 22:08
Thanks for the answer! So if I can only get 60 fps in a particular game, a 240hz monitor will literally have the same motion clarity than if I had a 60hz monitor correct?
Generally, yes, unless the monitor has a feature specific to improving 60fps (like the 60Hz strobe feature of ViewSonic XG2431).

Also, if you do 60fps inside a 240Hz conduit, you still have benefits even if no difference in blur.
- You have much less input lag, since those 60fps frames are transferred over the video cable in just 1/240sec apiece.
- You have better VRR behaviors usually, with 60fps-via-240Hz-VRR, than 60fps-via-144Hz-VRR.
- If you use VSYNC OFF, tearing is much less visible since tearlines are visible for only 1/240sec instead of 1/60sec

So you still have multiple benefits, when doing 60fps content on a computer via a GPU outputting 240Hz.
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Re: Motion clarity question

Post by Chief Blur Buster » 05 Jul 2024, 19:49

kurtdh wrote:
01 Jul 2024, 14:21
I understand how a higher hz gives you better motion clarity, but does actual FPS factor into this? For example, will motion clarity be the same in both scenarios?

#1. 240 fps at 240 hz
#2. 60 fps at 240 hz
Yes, framerate --
If you don't use any strobing features, motion blur is frametime.
Double framerate will halve eye-tracking motion blur assuming GtG=0. This effect will be much more noticable on OLED than LCD.
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kurtdh
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Re: Motion clarity question

Post by kurtdh » 19 Jul 2024, 19:44

Chief Blur Buster wrote:
05 Jul 2024, 19:49
kurtdh wrote:
01 Jul 2024, 14:21
I understand how a higher hz gives you better motion clarity, but does actual FPS factor into this? For example, will motion clarity be the same in both scenarios?

#1. 240 fps at 240 hz
#2. 60 fps at 240 hz
Yes, framerate --
If you don't use any strobing features, motion blur is frametime.
Double framerate will halve eye-tracking motion blur assuming GtG=0. This effect will be much more noticable on OLED than LCD.
How does VRR affect this? Someone asked me this earlier and I wasn’t sure if VRR had an affect on motion clarity or not.

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Re: Motion clarity question

Post by Discorz » 20 Jul 2024, 02:59

If u are able to, I would highly recommend testing all the combinations yourself in Smooth Frog. There u can see all the changes happen in real time.

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Re: Motion clarity question

Post by Chief Blur Buster » 21 Jul 2024, 01:16

kurtdh wrote:
19 Jul 2024, 19:44
How does VRR affect this? Someone asked me this earlier and I wasn’t sure if VRR had an affect on motion clarity or not.
Short answer: No

Long answer: No, but other factors like different overdrive algorthms may create pixel response differences that makes VRR blurrier or sharper at the same frame rate.

The best way to explain this is that there is no difference between:
(A) scientifically perfect non-VRR sample and hold display of a certain frame rate (as a divisor of Hz, like 30fps, 60fps, 120fps on a 120Hz)
(B) scientifically perfect VRR display doing that same framerate in a perfectly framepaced manner.

In this case, the persistence blur is exactly identical: frametime
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