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Is there a DP2.1 to HDMI2.1 Adapter supporting 4K@144Hz with VRR support?

Is there a DP2.1 to HDMI2.1 Adapter supporting 4K@144Hz with VRR support?

Updated on 18-11-2025 in Adapters and Cables

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PVVC 10 0 on 02-06-2025

Hello,

I have a 5090 which has 3x DP 2.1 ports.

I have 3 monitors that have HDMI 2.1 ports and would like to connect them to the DP 2.1 ports of the 5090. I’m looking for the correct adapter.

I need to be driving them at 3840×2160@144Hz in 10bit color + HDR each.

So far, the only adapter with DP 2.1 to HDMI 2.1 I have found is this one: CSV-7330 I’m not sure if it is suiteable, as it is DP to 3x HDMI. But I guess using each dedicated DP port (per monitor) would make more sense. So using 3 adapters.

My monitors do not work well with DSC, so I need a solution that doesn’t use Display Stream Compression.

What I’ve tried is using the “old” adapter CAC-1080 – this actually works at the desired 144Hz. But sadly it doesn’t support VRR (G-Sync in case of my monitors).

Is the CSV-7330 suitable for my scenario? And does it support G-Sync (VRR)? Or is there another adapter you can recommend.

Thanks in advance!

Hello,
I have a 5090 which has 3x DP 2.1 ports.
I have 3 monitors that have HDMI 2.1 ports and would like to connect them to the DP 2.1 ports of the 5090. I'm looking for the correct adapter.
I need to be driving them at <a target="_blank" rel="nofollow" href="mailto:3840x2160@144Hz">3840x2160@144Hz</a> in 10bit color + HDR each.
So far, the only adapter with DP 2.1 to HDMI 2.1 I have found is this one: CSV-7330 I'm not sure if it is suiteable, as it is DP to 3x HDMI. But I guess using each dedicated DP port (per monitor) would make more sense. So using 3 adapters.
My monitors do not work well with DSC, so I need a solution that doesn't use Display Stream Compression.
What I've tried is using the "old" adapter CAC-1080 - this actually works at the desired 144Hz. But sadly it doesn't support VRR (G-Sync in case of my monitors).
Is the CSV-7330 suitable for my scenario? And does it support G-Sync (VRR)? Or is there another adapter you can recommend.
Thanks in advance!

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Wiktor 2 0 on 19-06-2025

Hi,
What kind of monitors do you have?
The CSV-7330 would work, but as you said, it’s better to use three separate ports.
Our CAC-1088 adapters are the best option for you. They use DisplayPort 1.4 + (DSC) input and HDMI 2.1 output.
VRR is tricky because GPU, chipset, and screen manufacturers can’t find a reliable solution for stable VRR when switching between DP and HDMI. Our chipset supports this technology, but we don’t market our products as such because of inconsistent compatibility.

leem 0 on 12-07-2025

I’ve been looking for a g-sync displayport to hdmi adapter for years for a samsung tv. I’m pretty sure I tried the CAC-1088 and it didn’t work with gsync. Is there any chance that the CSV-7330 would?

Wiktor 0 on 07-08-2025

If you have the CAC-1088, you could try using different firmware. There is a version that could potentially enable VRR. There is a slight chance that it might be unstable, but you can always revert back.
Contact support 🙂

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LAbRat810 5 0 on 16-08-2025

I recently purchased CSV-7330 from the Club3D store on Amazon.com (US), in the ‘long shot hope’ that VRR could be made to work. I have given up on that expectation and will settle for 4k144hz 10bit HDR; which, CSV-7330 is supposed to support.

However, no matter how I configure my RX 9070 XT, I cannot get any refresh rate higher than 120hz; even, in my 32″ 4K240hz OLED’s 1080P480hz mode. I’ve tried both DP ports, reset and reseated, etc.
Oddly, the adapter is handshaking DP2.1 UHBR13.5×4(DP54), but not advertising >120hz on any resolution.

In researching my issue, I discovered a discrepancy between the website’s product listing, and the included (and hosted) quick install guide.
The website makes no mention of any refresh rate higher than 120hz. The included documentation explicitly mentions 4K144hz support.

Are production CSV-7330s even capable of 4K144hz? Is a firmware update incoming to restore originally-intended function?
Am I part of a known incompatibility?

LAbRat810 0 on 17-08-2025

Progress.

I was able to get all advertised functionality on the CSV-7330 by:
-Connecting the desired HDMI 2.1 display *natively* over HDMI2.1 to any system capable of full HDMI2.1 output.
-Using CRU (Custom Resolution Utility by ToastyX) to export the “native HDMI2.1 connection” EDID file.
-Re-connecting the HDMI2.1 display to the desired PC, through the CSV-7330 hub.
-Using CRU on the desired system, Import that ‘native HDMI’ EDID over the EDID CSV-7330 imposes.

Before I did this procedure, I was only able to select 120hz on any given res/bit depth, and was having flickering on the desktop.
After, I have both full 4K144 4:4:4 RGB 10-bit HDR, and 4K240 4:4:4 RGP 10-bit HDR, no flickering (DSC works now, apparently).

According to my LG OLED’s OSD, the CSV-7330 Adapter/Hub, is not dropping frames at 240hz, and appears to be fully capable of DSC-enabled 4K240 HDR10 4:4:4 (single display).

Sadly, unlike the Cable Matters DP1.4->HDMI2.1 adapter “VRR Unsupported” isn’t a CYA, it’s a fact. I’ve yet to get VRR/FreeSync working w/ the CSV-7330 but, at least I was able to get all the advertised capacities after modification.

Progress. I was able to get all advertised functionality on the CSV-7330 by: -Connecting the desired HDMI 2.1 display *natively* over HDMI2.1 to any system capable of full HDMI2.1 output. -Using CRU (Custom Resolution Utility by ToastyX) to export the "native HDMI2.1 connection" EDID file. -Re-connecting the HDMI2.1 display to the desired PC, through the CSV-7330 hub. -Using CRU on the desired system, Import that 'native HDMI' EDID over the EDID CSV-7330 imposes. 
Before I did this procedure, I was only able to select 120hz on any given res/bit depth, and was having flickering on the desktop. After, I have both full 4K144 4:4:4 RGB 10-bit HDR, and 4K240 4:4:4 RGP 10-bit HDR, no flickering (DSC works now, apparently). According to my LG OLED's OSD, the CSV-7330 Adapter/Hub, is not dropping frames at 240hz, and appears to be fully capable of DSC-enabled 4K240 HDR10 4:4:4 (single display). 
  
Sadly, unlike the Cable Matters DP1.4->HDMI2.1 adapter "VRR Unsupported" isn't a CYA, it's a fact. I've yet to get VRR/FreeSync working w/ the CSV-7330 but, at least I was able to get all the advertised capacities after modification.

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joevt 0 on 17-08-2025

I was able to get all advertised functionality on the CSV-7330 by:
-Connecting the desired HDMI 2.1 display *natively* over HDMI2.1 to any system capable of full HDMI2.1 output.
-Using CRU (Custom Resolution Utility by ToastyX) to export the “native HDMI2.1 connection” EDID file.
-Re-connecting the HDMI2.1 display to the desired PC, through the CSV-7330 hub.
-Using CRU on the desired system, Import that ‘native HDMI’ EDID over the EDID CSV-7330 imposes.
From LAbRat810

The CSV-7330 is modifying the EDID? Can you post the hex of the original EDID and the EDID from the CSV-7330 so we can decode it and see the modifications?

Is there a tool from Synaptics in the Microsoft Store that can identify the chip that is used in the CSV-7330? Maybe VmmDPTool64?
https://apps.microsoft.com/search/publisher?name=Synaptics+Incorporated&hl=en-US&gl=US

[quote author="LAbRat810"] I was able to get all advertised functionality on the CSV-7330 by: -Connecting the desired HDMI 2.1 display *natively* over HDMI2.1 to any system capable of full HDMI2.1 output. -Using CRU (Custom Resolution Utility by ToastyX) to export the "native HDMI2.1 connection" EDID file. -Re-connecting the HDMI2.1 display to the desired PC, through the CSV-7330 hub. -Using CRU on the desired system, Import that 'native HDMI' EDID over the EDID CSV-7330 imposes. [/quote] 
The CSV-7330 is modifying the EDID? Can you post the hex of the original EDID and the EDID from the CSV-7330 so we can decode it and see the modifications? 
  
Is there a tool from Synaptics in the Microsoft Store that can identify the chip that is used in the CSV-7330? Maybe VmmDPTool64? <a href="https://apps.microsoft.com/search/publisher?name=Synaptics+Incorporated&hl=en-US&gl=US" target="_blank" rel="nofollow noopener">https://apps.microsoft.com/search/publisher?name=Synaptics+Incorporated&hl=en-US&gl=US</a>

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LAbRat810 0 on 17-08-2025

Using the VMMDPtool64, I receive a “can not find Synaptics MST DP Hub IC”

I have the .BIN I exported via CRU, but I don’t think that’s exactly the dump you’re looking for. (nor, can I apparently attach it).

Oberon27 0 on 18-09-2025

Cable matters DP 1.4 to HDMI 2.1 works at 120hz and gets the VRR on my LG OLED B4 triple screen setup with my AMD 7900 XTX. Cable matters model number is 102101-BLK. They have a software update that makes it work. Simple file to down load and run. I am now able to use the AMD FreeSync that is an option to turn on on my LG OLED B4.

LAbRat810 0 on 18-11-2025

Cable matters DP 1.4 to HDMI 2.1 works at 120hz and gets the VRR on my LG OLED B4 triple screen setup with my AMD 7900 XTX. Cable matters model number is 102101-BLK. They have a software update that makes it work. Simple file to down load and run. I am now able to use the AMD FreeSync that is an option to turn on on my LG OLED B4.

From Oberon27

Thanks for the input. I’d read that the Cable Matters adapter unofficially support VRR.

That’s helpful to know but, isn’t going to provide a better experience than native-connected DP1.4 on my 32″ LG 240hz/480hz 4k/1080p OLED.

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I recently purchased CSV-7330 from the Club3D store on Amazon.com (US), in the 'long shot hope' that VRR could be made to work. I have given up on that expectation and will settle for 4k144hz 10bit HDR; which, CSV-7330 is supposed to support. However, no matter how I configure my RX 9070 XT, I cannot get any refresh rate higher than 120hz; even, in my 32" 4K240hz OLED's 1080P480hz mode. I've tried both DP ports, reset and reseated, etc. Oddly, the adapter is handshaking DP2.1 UHBR13.5x4(DP54), but not advertising >120hz on any resolution.  In researching my issue, I discovered a discrepancy between the website's product listing, and the included (and hosted) quick install guide.  The website makes no mention of any refresh rate higher than 120hz. The included documentation explicitly mentions 4K144hz support. 
Are production CSV-7330s even capable of 4K144hz? Is a firmware update incoming to restore originally-intended function? Am I part of a known incompatibility?

Cancel