Question OLED and G-Sync ?

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djsolidsnake86

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Mar 26, 2015
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I have in mind to buy a 4k oled, I was oriented on the panasonic (lz980) but I would like to understand if they have gsync or not (having nvidia as gpu) and if it is a necessary thing for the tv to have it (I know panasonic generally have only amd freesync and vrr), among other things I read that sony and panasonic do not put gsync in their tv, but vrr, so what are the differences between vrr and gsync?
 
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Variable refresh rate (vrr) means that the tv will adjust in real time according to the framerate output of your pc resulting in less tearing and stutters. G-Sync is Nvidia's own vrr technology, same as Freesync for AMD.

In the case of the lz980 it has both vrr and allm support, so the performance should be great (supports 4K at 120 Hz)
 
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Rathnhake said:
Variable refresh rate (vrr) means that the tv will adjust in real time according to the framerate output of your pc resulting in less tearing and stutters. G-Sync is Nvidia's own vrr technology, same as Freesync for AMD.

In the case of the lz980 it has both vrr and allm support, so the performance should be great (supports 4K at 120 Hz)
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but gsync will work or only work vrr? there are differences between two
 
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BFG-9000 said:
Specifically, "G-Sync Compatible" is completely identical to AMD Freesync and what got put into the HDMI spec.

G-Sync and G-Sync Ultimate are the ones that require the proprietary hardware module in the monitor.
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i understand now! what are differences between gsync comp and gsync/ultimate?
there is a list of oled tvs that are gsync/ultimate? thanks
 
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G-Sync ultimate basically requires HDR and at least 144Hz refresh capability. nVidia maintains a list of certified monitors and I only see one OLED on it that's G-Sync Ultimate and no G-Sync ones.

OLED technology in general isn't well suited for high refresh rates or very high brightness so you are only going to really find G-Sync Compatible ones. Note that non-certified G-Sync Compatible monitors with HDMI 2.1 should still work fine but with varying minimum and maximum refresh rates before dropping out of VRR so you should really refer to reviews for those.
 
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BFG-9000 said:
G-Sync ultimate basically requires HDR and at least 144Hz refresh capability. nVidia maintains a list of certified monitors and I only see one OLED on it that's G-Sync Ultimate and no G-Sync ones.

OLED technology in general isn't well suited for high refresh rates or very high brightness so you are only going to really find G-Sync Compatible ones. Note that non-certified G-Sync Compatible monitors with HDMI 2.1 should still work fine but with varying minimum and maximum refresh rates before dropping out of VRR so you should really refer to reviews for those.
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I'm curious as to why you say OLED isn't well suited for high refresh rates?
 
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drivinfast247 said:
I'm curious as to why you say OLED isn't well suited for high refresh rates?
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hotaru.hino said:
That is curious considering the response time on OLED's is at least two orders of magnitude compared to LCDs.

At least if we actually cared about that metric anymore.
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I'm curious as well. I have a 77" CX in my home theater and 65" C1s in my bedrooms... and game on a 48" CX. I had a 3090 up till last week and was gaming at 60hz... and just upgraded to the 4090.

My OLED supports 120hz and I tried it with the 4090. The games I looked at still look amazing but honestly I didn't notice any difference at 120hz.

Been running 4K 60hz for the last 2 1/2 years... maybe I need to give 120hz a chance but if there's not any visual improvement I don't see much point in the added strain on the PC.
 
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With LCD you can shorten the response time and thus smearing and motion blur by overdriving the signal and then reversing the signal sharply afterwards to sort of push the pixels harder into changing quicker. If done right this can really work great, but of course can produce a lot of artifacts if done imperfectly. And of course the reason nobody cares about the actual GtG spec anymore is it's only for Gray-to-Gray and actual response time is different for each color-to-color

Theoretically, OLED has near-instantaneous response time (and thus 0ms GtG), so why does it still have motion blur? It's because of its sample-and-hold persistence blur (MPRT) and the most reasonable way to fix that is inserting interpolated frames while using high refresh rates (the setting for this is known by many names but is the one that gives you that direct-to-video "soap opera effect" on film movies. And is generally undesirable for games because of the added latency from the processing time). If you could only increase refresh rate to 1000Hz (definitely not possible with current OLED) then things should look sharp even with pretty fast motion. But merely increasing the refresh rate to 120Hz helps less than you'd hope
motion_blur_from_persistence_on_sample-and-hold-displays.png

So while MPRT turns out to be an issue with the refresh rates available with current OLED technology, this is probably only of real concern for professional gamers. I am only gaming at 1080p on a 4k OLED TV and it looks great to me, but I'm certain that no company would waste a $200 G-Sync module on such a display that couldn't really take full advantage of it.

The VRR prevents image tearing, but can make ghosting and smearing worse when the actual refresh rate drops well below 60. The hardware G-sync modules can retain sync to way lower framerates than software G-Sync Compatible or Freesync, but you can see why that would ideally call for a display that can strobe multiple times per frame when it's below 30Hz instead of just holding the image for over 33ms.
 
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BFG-9000 said:
But merely increasing the refresh rate to 120Hz helps less than you'd hope

So while MPRT turns out to be an issue with the refresh rates available with current OLED technology, this is probably only of real concern for professional gamers. I am only gaming at 1080p on a 4k OLED TV and it looks great to me
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Thanks for the info. I really don't feel like I'm missing much... as said.. 4K 60hz looks amazing... and when I went to 120hz last night I didn't see any noticeable improvement.
 
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BFG-9000 said:
G-Sync ultimate basically requires HDR and at least 144Hz refresh capability. nVidia maintains a list of certified monitors and I only see one OLED on it that's G-Sync Ultimate and no G-Sync ones.

OLED technology in general isn't well suited for high refresh rates or very high brightness so you are only going to really find G-Sync Compatible ones. Note that non-certified G-Sync Compatible monitors with HDMI 2.1 should still work fine but with varying minimum and maximum refresh rates before dropping out of VRR so you should really refer to reviews for those.
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I wanted to ask one more thing.. how to connect the gpu to an oled, hdmi-hdmi or display port-hdmi?
my gpu has DisplayPort 1.4a (x3), HDMI 2.1
 
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Gsync / variable refresh rate as part of hdmi 2.1 spec began with 3xxx series. Don't know how 16 or 20 came into this discussion, they have nothing relating to Hdmi 2.1. Displayport yes, but not Hdmi 2.0.

www.nvidia.com

HDMI 2.1, The New Standard For TVs, Is Supported By GeForce RTX 30 Series and 40 Series GPUs

Ensure the TV and equipment you’re buying supports the full range of HDMI 2.1 features and enhancements, and that your TV has the latest firmware updates.
www.nvidia.com
 
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