• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

4090 and DP1.4A?

PaulW

PaulW

PaulW

Associate
Joined
6 Jun 2005
Posts
753
Location
Plymouth / Cambridge
Hi,

i have no real option but to go with NVIDIA for my next GPU as i am a content creator and do more than play games. with my build kinda speced out, what will the 40 series cards with DP 1.4A give be refresh rate wise?
i have a LG 2k monitor which is a few years old that supports 144Hz how ever i probably want to get a 27" 4k monitor at some point. what the best the 4090 could get out of at 4k with its old DP connection. i know that 1.4a supports Display Stream Compression (DSC)

i'd love to go AMD but can't. Anyone know if Nvidia could / would do a refresh on the 40 series to support this or some other thing in the future?

forgeive me as i am not that clued up on DP standards and so am after a bit of wisdom so i know what i am stepping into and what is or what is not possible

Thanks

P
 
Last edited:
PaulW said:
Hi,

i have no real option but to go with NVIDIA for my next GPU as i am a content creator and do more than play games. with my build kinda speced out, what will the 40 series cards with DP 1.4A give be refresh rate wise?
i have a LG 2k monitor which is a few years old that supports 144Hz how ever i probably want to get a 27" 4k monitor at some point. what the best the 4090 could get out of at 4k with its old DP connection. i know that 1.4a supports Display Straem Compression (DSC)

i'd love to go AMD but can't. Anyone know if Nvidia could / would do a refresh on the 40 series to support this or some other thing in the future?

forgeive me as i am not the clued up on PD standards and so am after a bit of wisdom so i know what i am stepping into and what is or what is not possible

Thanks

P
Click to expand...
Hi Paul,

Ironic timing, I just sold my 4090 for a 7900xtx because it could run 8k @ 240hz due to lack of DP 2.1 you'll be ok at 4k with the 4090 providing it is extremely high refresh rates
 
With DSC you can do 4K 240 on supported monitors with a 4090 i.e Samsung Odyssey etc... 1440P as far as I know without DSC, 240Hz is the limit.
 
Last edited:
With DSC 144+Hz at UHD (depends a bit on colour depth and features such as HDR), without 120Hz.
 
Last edited:
DP 1.4a is not really an old connection yet as DP2.0 is hardly widespread (are there any DP 2.0 monitors yet?). I get 4K 165hz out of my G7 with it same as I do using HDMI 2.1 so you should be fine.
 
Last edited:
I did a butt load of research on this a while back when I was buying my monitor and found out a 5700XT with the right cable can do 4k 144Hz with 1.4a (I think). You should be fine. This will for sure use Display Stream Compression; so some colour channels get squished a bit to fit the bandwidth. Just get a good cable and it should be fine; look for something rated for 8k60 if it gets confusing.

Edit: for my laptop with DP over USB-C it tops out at 4k120
 
Last edited:
Captain_Bosh said:
DP 1.4a is not really an old connection yet as DP2.0 is hardly widespread (are there any DP 2.0 monitors yet?). I get 4K 165hz out of my G7 with it same as I do using HDMI 2.1 so you should be fine.
Click to expand...
DisplayPort version 1.4a was published in April 2018.

DisplayPort version 2.0 was published in Jun 2019.

DisplayPort version 2.1 was published in Oct 2022.

en.wikipedia.org

DisplayPort - Wikipedia

en.wikipedia.org en.wikipedia.org

So DP 1.4a is over 5 years old and should have been dead on last gen cards 30 series Nvidia and AMD 6000 series cards but Nvidia decided was good enough on a 40 series knowing DP2.1 monitors were coming out, AMD is only one this generation with DP 2.1 capable GPUS.

Also Samsung's new monitor is DP 2.1 57" G95NC Odyssey Neo G9 240Hz Dual UHD Monitor.

 
faceman123 said:
Ironic timing, I just sold my 4090 for a 7900xtx because it could run 8k @ 240hz due to lack of DP 2.1 you'll be ok at 4k with the 4090 providing it is extremely high refresh rates
Click to expand...

Purgatory said:
AMD is only one this generation with DP 2.1 capable GPUS.
Click to expand...

Hmm, these comments didn't age well did they...
AMD's shady marketing that their cards support DP2.1 did the trick I guess. But now it's evident they don't support UHBR20 so need to use DSC anyway with 4k 240hz monitors

AMDs workstation cards are the only ones which support UHBR20
Disappointed tbh because I was interested to see if people could tell the difference between DSC off/on at 4k 240hz
 
JediFragger said:
Nah, they've always been upfront about the cards supporting a max of UBR13.5 (if you bothered to look up the specs at the time). You're making a mountain out of a molehill, bleeding edge tech like this always has teething issues.
Click to expand...

They had DP2.1 support in big writing all over their slides at launch
People were slating the 40 series for not having it and claiming they'd be getting the 7900s for it etc

I've personally been waiting for a monitor which supports it so we can get some comparisons and it's turned out to be more marketing BS :(
 
chaparral said:
I thought some of the highend AMD cards had DP 2.1 outputs :confused:
Click to expand...

nlel1975 said:
Only real need for DP2.1 is for higher refresh rates than is currently available with DSC.
Click to expand...

They do have DP2.1 but only poverty spec 2.1, not full UHBR20 spec.

They can't do 4K 240hz on the new QD-OLED without DSC for example, even though the Gigabyte QD-OLED supports it
 
Last edited:
Good timing really, watched these two video's on the DP2.1 subject.

youtu.be

DisplayPort 2.1 Tested: Essential for 4K 240Hz Monitors?

Support us on Patreon: https://www.patreon.com/hardwareunboxedJoin us on Floatplane: https://www.floatplane.com/channel/HardwareUnboxedBuy relevant products ...
youtu.be youtu.be

and

youtu.be

DisplayPort 2.1 Has a Cable Problem

Support us on Patreon: https://www.patreon.com/hardwareunboxedJoin us on Floatplane: https://www.floatplane.com/channel/HardwareUnboxedBuy relevant products ...
youtu.be youtu.be

Will have to wait until more mainstream GPU's support this, not to mention the cable situation.
 
You must log in or register to reply here.
Back
Top Bottom