HDR conundrum due to limited HDMI ports on 1080ti

So ive ran into an issue of sorts. Surprise! I spent an entire weeks worth of days top to bottom researching the limited amount of hdr 4k monitors available.

finally dialed in on one that hits all the criteria im willing to settle for atm.

Low and behold, its only DP1.2 so will only accept HDR via hdmi.

Great if i used 1 display - alas I use 2 and my 1080ti is all DP with a token hdmi.

At first I thought, ill just connect the other one to the onboard uhd630 graphics! Then i remembered, using the onboard with a discrete only allows you to allocate like 64mb of ram to the gpu which causes all kinds of flickering issues with softwares like adobe dimension and OBS to name a few.

So in the end, ill need to connect both displays to my discrete (which is how i have it now, ala DP, as they arent hdr compliant)

What are my options?

I gather an active displayport adapter, many seem to support 4k@60 but its not looking like they support HDR? Am i screwed?

I'm confused...you have an EVGA 1080FE or a 1080ti? Either way, you have 3xDP1.4 and 1xHDMI 2.0b and use both monitors on you DP ports.

Also DP is fully HDR compliant as of DP 1.4 which Pascal 1060 and higher have. The monitor itself might not be HDR compliant with DP1.4 but I don't see why you couldn't plug in your HDMI port to your monitor and use that?

Alternatively if you really want to use a DP output on the card and convert to HDMI 2.0b I would recommend going with the best quality ones out there.
Club3D CAC-1080 Active DisplayPort 1.4 to HDMI 2.0b HDR Adapter
https://www.amazon.com/CAC-1080-Dis...7010&s=gateway&sprefix=club3d+,aps,203&sr=8-4

i have a 1080ti which is irrelevant as you said. Assume you were going off my sig which apparently needs updating

yes i will be connecting 1 of the dispays via the hdmi off the card, no problems there. The secondary display is my concern. DP1.4 is HDR compliant which the card is, however the monitor only has DP1.2 which means HDR is only via HDMI.

So i need an adapter that will convert DP1.4 to HDMI2.0(a/b?) and support HDR in doing so.

Found several that claimed to be able to convert and support 4k@60 but stopped at supporting HDR as well.

ill take a look at that adapter you posted

klepp0906 said:

i have a 1080ti which is irrelevant as you said. Assume you were going off my sig which apparently needs updating

yes i will be connecting 1 of the dispays via the hdmi off the card, no problems there. The secondary display is my concern. DP1.4 is HDR compliant which the card is, however the monitor only has DP1.2 which means HDR is only via HDMI.

So i need an adapter that will convert DP1.4 to HDMI2.0(a/b?) and support HDR in doing so.

Found several that claimed to be able to convert and support 4k@60 but stopped at supporting HDR as well.

ill take a look at that adapter you posted

Click to expand...

My day job has a lot of "compatibility testing" related to display, HDR, etc... There might be other adapters that are capable of it, but those Club3d ones are the best quality by far. They also have a pretty decent reputation in the industry for being the first to support HDCP2.2 over DP to HDMI.

klepp0906 said:

i have a 1080ti which is irrelevant as you said. Assume you were going off my sig which apparently needs updating

yes i will be connecting 1 of the dispays via the hdmi off the card, no problems there. The secondary display is my concern. DP1.4 is HDR compliant which the card is, however the monitor only has DP1.2 which means HDR is only via HDMI.

So i need an adapter that will convert DP1.4 to HDMI2.0(a/b?) and support HDR in doing so.

Found several that claimed to be able to convert and support 4k@60 but stopped at supporting HDR as well.

ill take a look at that adapter you posted

Click to expand...

As Kaos_Drem said, the Club3D CAC 1080 will do the job, I'm using one with my 1080ti.
It is the only solution on the market for HDR.

If it doesnt appear to support HDR go to this page and click the Downloads link at the bottom to get the firmware update.
https://www.club-3d.com/en/detail/2442/displayport_1.4_to_hdmi_2.0b_hdr/
edit: They no longer provide updates on the website! You have no idea what updates there have been and what they fix.
I wont be recommending this company until they resolve this.

You may also need to update your 1080ti to properly support DP1.4
https://www.nvidia.com/object/nv-uefi-update-x64.html
The tool automatically updates part of the firmware.
Run it again to confirm if it has been applied.


I found a downside to the CAC 1080.
It supports 7.1 24/192KHz and Atmos etc.
But it does not recognise my Denon AVR (x4400H) as supporting anything other than 7.1 16/48KHz PCM, it wont even do 44.1KHz!
Even overriding the Edid didnt help.
Atmos etc pass through ok.
Club3D support said they dont have a way of remedying this atm and offered a refund.
So be aware its audio may not work fully with Denon or Marantz (same company) AVRs.

thanks much for the info guys, looks like the club3d one it is. I use an onkyo avr so hopefully its maker specific and not affected should i make use of it ;p

I have another question, latency. I heard active adapters can add a bunch/do add a bunch? True or?

No latency issues at all.
I havent heard of anyone else struggling with the audio issues I get, then again I am into high def audio.
If I let windows do its stuff normally I wouldnt have noticed the issue.
But I choose to play music audio without the windows mixer (wasapi or ASIO).
It still sounds very good at 16/48KHz so worst case you are not in the cold.

Why can't you connect one monitor to DP and the HDR monitor to HDMI? HDR worked just fine on my Titan X connected to my TV with HDMI while my PG278Q was connected with DP at the same time.

Nenu said:

As Kaos_Drem said, the Club3D CAC 1080 will do the job, I'm using one with my 1080ti.
It is the only solution on the market for HDR.

If it doesnt appear to support HDR go to this page and click the Downloads link at the bottom to get the firmware update.
https://www.club-3d.com/en/detail/2442/displayport_1.4_to_hdmi_2.0b_hdr/

You may also need to update your 1080ti to properly support DP1.4
https://www.nvidia.com/object/nv-uefi-update-x64.html
The tool automatically updates part of the firmware.
Run it again to confirm if it has been applied.


I found a downside to the CAC 1080.
It supports 7.1 24/192KHz and Atmos etc.
But it does not recognise my Denon AVR (x4400H) as supporting anything other than 7.1 16/48KHz PCM, it wont even do 44.1KHz!
Even overriding the Edid didnt help.
Atmos etc pass through ok.
Club3D support said they dont have a way of remedying this atm and offered a refund.
So be aware its audio may not work fully with Denon or Marantz (same company) AVRs.

Click to expand...

Responding to this because this came up on a Google search. I'm running into the same problem with my Denon receivers.

I bought a couple of these Club3D DP->HDMI adapters for my HTPC thinking these were hot stuff, and while they do 4K60 and support all the Dolby/DTS features my AVR-S750H supports, they can't do anything more than stereo PCM. I tried on an AVR-3806 with similar results. You can set your Denon AVR to 7.1 speakers in Windows, but audio will only come out the front L/R speakers. I plug in a $9 DP->HDMI adapter and I have everything except 4K60 and a few odd Dolby/DTS codecs (still have lossless stuff and 4K30). I don't really need the 7.1 PCM because I think I can just work around it, but it's kinda lame so I might return them if it doesn't cost me anything.

djoye said:

Responding to this because this came up on a Google search. I'm running into the same problem with my Denon receivers.

I bought a couple of these Club3D DP->HDMI adapters for my HTPC thinking these were hot stuff, and while they do 4K60 and support all the Dolby/DTS features my AVR-S750H supports, they can't do anything more than stereo PCM. I tried on an AVR-3806 with similar results. You can set your Denon AVR to 7.1 speakers in Windows, but audio will only come out the front L/R speakers. I plug in a $9 DP->HDMI adapter and I have everything except 4K60 and a few odd Dolby/DTS codecs (still have lossless stuff and 4K30). I don't really need the 7.1 PCM because I think I can just work around it, but it's kinda lame so I might return them if it doesn't cost me anything.

Click to expand...

I asked Club3D about this, they said they cannot test it because they dont have a Denon AVR and offered a refund.
So I use the Club3D direct to my TV and my gfx cards HDMI out to my Denon AVR.

Gfx card thru the AVR works great for everything except 1440p 120Hz (not supported on the AVR), thats when I use the Club 3D adapter direct to the TV.

edit
Looking up the CAC 1080 on the Club3D website reveals they no longer allow anyone to update their adapter, there are no updates available. There is now a new version, the CAC 1082.
I downloaded an update for my CAC 1080 to fix HDR not working probably a year ago, this is no longer available.
I find this a worry for the future. If I buy a new cable and dont download updates before the next model comes out, will I miss my chance to update it?

For all I know, there has been an update for the CAC 1080 to let it work properly with Denon AVRs.
But there is no information about any updates.
I am not impressed.

There is a recent thread on their forum where someone asked for help with this issue and were told to email support.
They tried twice with no response.
After stating that in the thread, they were again met with no response.
https://insights.club-3d.com/thread...mi-2-0b-hdr-adapter-not-outputting-5-1-audio/

Another terrible thread.
https://insights.club-3d.com/thread/cac-1080-does-not-output-surround-audio/
People were told to email support, 2 of them were ignored after sending a lot of emails, the other didnt report back.
Club 3D staff who respond in the thread do nothing to assist.
1 person eventually got help when contacting Club 3D through facebook.

Seems like the only way to get any company's attention these days is to call out and shame them on social media...