240hz non-bfi vs 120hz bfi?

Ask about motion blur reduction in gaming monitors. Includes ULMB (Ultra Low Motion Blur), NVIDIA LightBoost, ASUS ELMB, BenQ/Zowie DyAc, Turbo240, ToastyX Strobelight, etc.
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deama
Posts: 368
Joined: 07 Aug 2019, 12:00

240hz non-bfi vs 120hz bfi?

Post by deama » 02 Oct 2022, 09:32

So I'm wondering which one would be better in terms of motion smoothness. Let's take an OLED panel as an example, a 240hz non-bfi OLED panel vs a 120hz panel, but it has BFI turned on.

Which one would be smoother?

RonsonPL
Posts: 122
Joined: 26 Aug 2014, 07:12

Re: 240hz non-bfi vs 120hz bfi?

Post by RonsonPL » 02 Oct 2022, 10:01

240Hz will be smoother

120Hz with BFI will be definitely better, though. If the BFI mode is working well, you should see vastly improved clarity in fast motion, as long as your framerate stays at exact 120fps all the time.

Image

deama
Posts: 368
Joined: 07 Aug 2019, 12:00

Re: 240hz non-bfi vs 120hz bfi?

Post by deama » 02 Oct 2022, 10:24

RonsonPL wrote:
02 Oct 2022, 10:01
240Hz will be smoother

120Hz with BFI will be definitely better, though. If the BFI mode is working well, you should see vastly improved clarity in fast motion, as long as your framerate stays at exact 120fps all the time.

Image
What if fps is lower? E.g. you're at 60fps, which one would be smoother than? 120hz + bfi?

RonsonPL
Posts: 122
Joined: 26 Aug 2014, 07:12

Re: 240hz non-bfi vs 120hz bfi?

Post by RonsonPL » 02 Oct 2022, 14:44

Read this article:
https://blurbusters.com/faq/motion-blur-reduction

Personally I value motion clarity above "smoothness". But those are two different things.
For smoothness you basically need even frame pacing for v-sync and framerate within operational window of g-sync (this may vary depending on the monitor and g-sync implementation)

For strobed/low persistence/BFI modes, you cannot get proper clarity unless you match your framerate to the refreshrate.
As shown below:
Image

For me it's hard to say what's worse. 60fps at 120Hz in strobed mode - gives this "doubled image" which looks awful. Without this, the image is blurred, so can look more smooth, but both look equally bad.
To the point I'd rather agree to suffer from the flicker and prefer playing in 15-20 minute stints, but with strobed 60fps at 60Hz instead of having to pick between any of those two horrible alternatives. OR.. I just pick a game without 60fps cap and aim for more. I'm lucky to have a monitor with perfect strobe modes in the range of 60-120Hz. So I just prefer to lower the res and lock the 120fps, use 120Hz, and enjoy all the smoothness I can get. My monitor maxes out at 144Hz so I don't have the dillema of 240Hz. Lucky for me ;)

If this does not answer your question, you will need to wait for an opinion from someone who actually uses g-sync. I'm a "clear motion orthodox". I don't use G-sync as I don't see the point (it requires me to disable the strobe/BFI and I'd never ever do that)
I'm afraid that's as much as I could help you here.

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