GPU-Z Display Bug via DP 2.1?

[negfuz]

Hello,

I have a Samsung 57" (G95NC) - and a 5090 Astral.

I bought a VESA Certified DP 2.1 Cable, the Club3D CAC-1094 (2meter).

I was running this monitor with HDMI 2.1, and on GPU-Z with HDMI, it doesn't show the LinkRate of 48GBPS under GPU-Z Advanced.

Connecting it via DP - now shows link rate of 10Gbps with 4 lanes (i.e. UHBR10?)

As far as I know, this monitor supports UHBR 13.5 MAX on DP 2.1. I've also changed the DP version from my monitor's OSD from DP 1.4 to 2.1.

This is what I am seeing (please see screenshot)

Bugged in GPU-Z?

Is there another software (or within nvidia somewhere where I can verify what it's connected at?).

I'm expecting to see Linkrate at 13.5 with 4 lanes at 54GBPS via my new ASUS RTX 5090 ASTRAL not 40 or 615098).

Thanks!!

Anyone?

 

[negfuz]

Anyone else? Comments? Do AMD GPUs also have this?

 

[W1zzard]

These readings are provided by the NVIDIA driver, those numbers definitely look like some kind of bug. I just take the value from the driver and convert it to Gbps

 

[negfuz]

These readings are provided by the NVIDIA driver, those numbers definitely look like some kind of bug. I just take the value from the driver and convert it to Gbps

Thanks for the response, makes sense the 'Current' is bugged - but what about the Link Rate for MAX? Shouldn't that be 13.5? Is that also from Nvidia Drivers? Rather than somewhere along the chain?

 

[Dr. Dro]

Thanks for the response, makes sense the 'Current' is bugged - but what about the Link Rate for MAX? Shouldn't that be 13.5? Is that also from Nvidia Drivers? Rather than somewhere along the chain?

The RTX 5090 fully supports UHBR20, so the max link should be 20 Gbps? Unless this is detected by monitor? Only AMD GPUs are limited to 13.5, with the RTX 4090 and earlier being limited to DP 1.4's HBR3 (8.1 Gbps per lane) mode. Regarding your issue, W1zz made a test build of GPU-Z with a new driver, maybe worth trying it? Also, try 576.88 driver if you haven't yet.

 

[negfuz]

The RTX 5090 fully supports UHBR20, so the max link should be 20 Gbps? Unless this is detected by monitor? Only AMD GPUs are limited to 13.5, with the RTX 4090 and earlier being limited to DP 1.4's HBR3 (8.1 Gbps per lane) mode. Regarding your issue, W1zz made a test build of GPU-Z with a new driver, maybe worth trying it? Also, try 576.88 driver if you haven't yet.

Uhhh I thought it would report back the weakest link in the chain to determine the max? Obviously the GPU can do UHBR20, but if the cable or monitor can't, it'd be limited to the weakest link. So I'd expect it to show 13.5 since it's connected to a 5090, or if your logic is right, then it should show 20 x 4 = 80, either way, 10 x 4 = 40 (less than HDMI 2.1), and that's wrong.

Where can I get the test build of GPU-Z?

I'm already on the latest 576.88 too

 

[Dr. Dro]

Uhhh I thought it would report back the weakest link in the chain to determine the max? Obviously the GPU can do UHBR20, but if the cable or monitor can't, it'd be limited to the weakest link. So I'd expect it to show 13.5 since it's connected to a 5090, or if your logic is right, then it should show 20 x 4 = 80, either way, 10 x 4 = 40 (less than HDMI 2.1), and that's wrong.

Where can I get the test build of GPU-Z?

I'm already on the latest 576.88 too

Yeah, your logic makes sense, but if it's "Max" as in, possible max, that could be it too? So confusing... Anyway, here you go

Thread '[GPU-Z Test Build] New Kernel Driver, Everyone: Please Test'

Tuesday at 10:59 AM

The attached build comes with a completely rewritten kernel driver for hardware access.

This was required, to fix some security issues, which could let attackers abuse our driver to do bad things(tm).

Please test the attached build on all hardware you can find, even older cards and older OS installs.

Everything should work correctly, exactly the same as the 2.66 public release (you can run both side-by-side to confirm)

Once you've tested, make a post please with the basic specs of the hardware config you checked (OS, 32/64-bit, CPU, GPU). No screenshot needed, unless you're having...

• W1zzard
• Replies: 65
• Forum: GPU-Z Test Builds

• 

 

[negfuz]

Yeah, your logic makes sense, but if it's "Max" as in, possible max, that could be it too? So confusing... Anyway, here you go

Thread '[GPU-Z Test Build] New Kernel Driver, Everyone: Please Test'

Tuesday at 10:59 AM

The attached build comes with a completely rewritten kernel driver for hardware access.

This was required, to fix some security issues, which could let attackers abuse our driver to do bad things(tm).

Please test the attached build on all hardware you can find, even older cards and older OS installs.

Everything should work correctly, exactly the same as the 2.66 public release (you can run both side-by-side to confirm)

Once you've tested, make a post please with the basic specs of the hardware config you checked (OS, 32/64-bit, CPU, GPU). No screenshot needed, unless you're having...

• W1zzard
• Replies: 65
• Forum: GPU-Z Test Builds

• 

Thanks for the link but just based on the description, its just a rewrite, not really the typical "beta" with new features/bug fixes. He's expecting the output to be identical - so don't think this is the fix we're hoping for. But either way, @W1zzard did circle in here, so perhaps hope he can figure out at least why the MAX LINK rate is showing as it is.

 

[W1zzard]

o don't think this is the fix we're hoping for

These betas test a new kernel driver, there is no change to the link rate code

 

[negfuz]

These betas test a new kernel driver, there is no change to the link rate code

Just to add - not sure if its the monitor causing this, or ANOTHER bug in GPU-Z, but when using DP 2.1 via OSD with a proper DP 2.1 cable (obviously), if I set the monitor in Picture by Picture mode (PBP) to split the screen into 2x 4K screens, 1 input from the GPU, and 1 input from another device. GPU-Z shows it's running at 8.1Gbps x 4 lanes - but when I disable PbP and reload GPU-Z, it shoots back up to the 10Gbps 4lanes / 600000000000Gbps output

Not sure why GPU-Z would display to DP 1.4 current/max if PBP is on .

... weird