ASUS and Acer UHD G-Sync HDR Monitors Forced to Use Color Compression at 120/144 Hz

by Hilbert Hagedoorn on: 06/18/2018 03:46 PM | source: | 43 comment(s)

We've mentioned the new Ultra HD G-Sync HDR ACER and ASUS monitors a couple of times already. Over the weekend some reported the ACER one got in the news due to a loud ventilator, today more news reaches the web, in high-refresh-rate modes, the displays fall back to color compression.

A few early adopters of these HDR, local dimming monster monitors noticed and reported on Reddit that when using a high refresh rate, the image quality dropped significantly. The story now is that the ASUS and Acer screens make use of color compression at 120 and 144 Hz, not because the panel couldn't handle it, but the main limitation is signal bandwidth over DisplayPort 1.4. This also means you pretty much need to run your Windows desktop at 60 Hz for a bit of a quality readable view.

DisplayPort 1.4 has too little bandwidth available to drive 4k, 144 Hz without compression. To bypass that, the screen monitor signal reverts to 4:2:2 chroma subsampling. basically your brightness information will remain intact, however, the color information will be based on half the resolution, 1920 x 2160 pixels. All is good up to 98 Hz, after that, it's 4:2:2 chroma subsampling ... on your 2500 Euro / 2000 USD Screen. Lovely. There's no real solution for this, other than new display connectors and graphics cards that do support such high bandwidth connections - HDMI 2.1.

chroma subsampling. (Picture: Wikimedia )

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GameLord
Member

Posts: 21
Joined: 2015-12-20

#5558304 Posted on: 06/18/2018 04:38 PM

422 looks very bad on my UHD TV. Only 444 or RGB is the way to go.

WhiskeyOmega
Senior Member

Posts: 283
Joined: 2015-04-14

#5558305 Posted on: 06/18/2018 04:39 PM

Its not even a 10bit panel. its an 8bit panel with processing

Agent-A01
Senior Member

Posts: 11574
Joined: 2010-12-27

#5558308 Posted on: 06/18/2018 04:42 PM

I'll wait for a 16:9, 23/24''; Freesync 2 monitor, below 200€. Thank you.

Yes we all know you want the very best for pennies.

Anyways. There are already Freesync 1 monitors for that price.

Why do you want FS 2? FS2 Adds HDR support and forces manufacturers to use LFC(which you can find on Freesync 1).

Do you think you'll get a high refresh rate with HDR support for cheap?

You'll be waiting a long time, probably indefinitely; even if they were that cheap I can guarantee they would be junk monitors as all are generally at that price point.

sammarbella
Senior Member

Posts: 3929
Joined: 2014-12-09

#5558312 Posted on: 06/18/2018 04:56 PM

Early adopter syndrome... this happens when display tech is ahead of other factors (here, connections).

Couldn't USB-C work for this? I don't know the numbers tbh

Yes, early adopter syndrome and "smart" hardware manufacturers selling Ferraris without wheels.

USB-C could be a solution but it's another huge mess by itself (get a couple of Tylernol at hand...just in case):

http://blog.fosketts.net/2016/10/29/total-nightmare-usb-c-thunderbolt-3/

https://www.digitaltrends.com/computing/usb-c-implementation-messy-and-unclear/

HDMI is the proper solution for TV and monitors and will arrive not before q3 2018...

H83
Senior Member

Posts: 3945
Joined: 2009-09-08

#5558314 Posted on: 06/18/2018 05:05 PM

Selling 2500€ monitors with this kind of issues is a very bad joke

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