Question RTX 5080 showing PCI 5.0 x4 speed

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gregorius11

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Oct 17, 2019
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Hi,

I've just built a new PC (specs below) and it seems that my GPU is stuck in PCI 5.0 x4 mode as reported by BIOS, HWinfo and GPU-Z. Screenshots below.

https://imgur.com/a/lUNTerE
View: https://imgur.com/a/lUNTerE


At first I thought this is some power saving feature, but unfortunetely the x4 number didn't budge while playing demanding games. Only the GT/s speed went up to 32.0 GT/s.
I confirm that the GPU is put in the top PCI x16 slot. I also have an M.2 NVME drive that populates the M2A_CPU slot. According to Gigabyte, PCI express bandwith sharing only occurs if M2B_CPU and M2C_CPU slots are populated, so that should not be an issue either:

"1 x PCI Express x16 slot (PCIEX16), integrated in the CPU:
AMD Ryzen™ 9000/7000 Series Processors support PCIe 5.0 x16 mode
* The M2B_CPU and M2C_CPU connectors share bandwidth with the PCIEX16 slot.
When the M2B_CPU or M2C_CPU connector is populated, the PCIEX16 slot operates at up to x8 mode."

Any guidance would be greatly appreciated.
Also a question - are issues like that always hardware related or can they be caused by a buggy driver for example?

Specs:
Mobo: Gigabyte X870 AORUS Elite WIFI7. BIOS Version: F4
CPU: AMD Ryzen 7 9800 X3D
RAM: Kingdston Fury 32GB (2x16GB) 6000MHz CL30 Beast Black XMP
GPU: Gigabyte GeForce RTX 5080 Gaming OC
GPU Driver: 576.40
SSD: Kingston 2TB M.2 PCIe Gen4 NVMe KC3000
PSU: be quiet! Straight Power 12 1000W 80 Plus Platinum

Thanks.
 
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Mobo: Gigabyte AORUS Elite WIFI7. BIOS Version: F4
https://www.gigabyte.com/Motherboard/X870E-AORUS-ELITE-WIFI7-rev-10-11/support#dl
You have a BIOS version pending update.

On the topic of BIOS, if the PCIe slot for the GPU is set to auto, see if there are any options to change it to PCIe 5.0.

Also a question - are issues like that always hardware related or can they be caused by a buggy driver for example?
Does the speed of your GPU's slot change if the system is taxed with a game or benchmarking app?
 
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Lutfij said:
1. On the topic of BIOS, if the PCIe slot for the GPU is set to auto, see if there are any options to change it to PCIe 5.0.

Also a question - are issues like that always hardware related or can they be caused by a buggy driver for example?
2. Does the speed of your GPU's slot change if the system is taxed with a game or benchmarking app?
Click to expand...

1. Yes, I've changed it from Auto to Gen 5. Still shows as PCIe 5.0 x16 @ 5.0 x4. I've also tried changing it to Gen 4 out of curiosity. Then the BIOS shows PCIe 5.0 x16 @ 4.0 x4

2. No, it still remains as PCIe 5.0 x4. Same when I try the render test in GPU-Z.

https://imgur.com/a/0DBKQTJ
View: https://imgur.com/a/0DBKQTJ
 
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gregorius11 said:
Hi,

I've just built a new PC (specs below) and it seems that my GPU is stuck in PCI 5.0 x4 mode as reported by BIOS, HWinfo and GPU-Z. Screenshots below.

https://imgur.com/a/lUNTerE
View: https://imgur.com/a/lUNTerE


At first I thought this is some power saving feature, but unfortunetely the x4 number didn't budge while playing demanding games. Only the GT/s speed went up to 32.0 GT/s.
I confirm that the GPU is put in the top PCI x16 slot. I also have an M.2 NVME drive that populates the M2A_CPU slot. According to Gigabyte, PCI express bandwith sharing only occurs if M2B_CPU and M2C_CPU slots are populated, so that should not be an issue either:

"1 x PCI Express x16 slot (PCIEX16), integrated in the CPU:
AMD Ryzen™ 9000/7000 Series Processors support PCIe 5.0 x16 mode
* The M2B_CPU and M2C_CPU connectors share bandwidth with the PCIEX16 slot.
When the M2B_CPU or M2C_CPU connector is populated, the PCIEX16 slot operates at up to x8 mode."

Any guidance would be greatly appreciated.
Also a question - are issues like that always hardware related or can they be caused by a buggy driver for example?

Specs:
Mobo: Gigabyte AORUS Elite WIFI7. BIOS Version: F4
CPU: AMD Ryzen 7 9800 X3D
RAM: Kingdston Fury 32GB (2x16GB) 6000MHz CL30 Beast Black XMP
GPU: Gigabyte GeForce RTX 5080 Gaming OC
GPU Driver: 576.40
SSD: Kingston 2TB M.2 PCIe Gen4 NVMe KC3000
PSU: be quiet! Straight Power 12 1000W 80 Plus Platinum

Thanks.
Click to expand...
I just had a look on my system and GPU-Z with its little render test running also reports PCIe x 16 5.0 @ x4 5.0
When the render test isn't running it reports PCIe x 16 5.0 @ x4 1.1 I assume due to a power saving feature.

Maybe it only need 4 lanes of PCIe 5 bandwidth?
 
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I forgot to mention that the chipset of my mobo is X870. I've updated the main post.

Flayed said:
I just had a look on my system and GPU-Z with its little render test running also reports PCIe x 16 5.0 @ x4 5.0
When the render test isn't running it reports PCIe x 16 5.0 @ x4 1.1 I assume due to a power saving feature.

Maybe it only need 4 lanes of PCIe 5 bandwidth?
Click to expand...

Not sure. If that was the case then I'm guessing more people with RTX 5000 cards would be scratching their heads as to why their card operates at x4 speed?
Also, looking at this random guy's screenshot of GPU-Z, his RTX 5080 correctly operates at x16.

https://imgur.com/a/CoQIMqJ
View: https://imgur.com/a/CoQIMqJ
 
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gregorius11 said:
I forgot to mention that the chipset of my mobo is X870. I've updated the main post.



Not sure. If that was the case then I'm guessing more people with RTX 5000 cards would be scratching their heads as to why their card operates at x4 speed?
Also, looking at this random guy's screenshot of GPU-Z, his RTX 5080 correctly operates at x16.

https://imgur.com/a/CoQIMqJ
View: https://imgur.com/a/CoQIMqJ
Click to expand...
Your right it should be using the full 16 lanes during heavy loads. I think the thing to do is check for a bios update for the motherboard and remove the card, clean the contacts on the card and the slot (if that is possible?) and reseat the card.
 
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Flayed said:
I've just been looking at threads on this topic and solutions other people have found include:

Reseating the graphics card

Reseating the memory

Reseating the CPU

Replacing the motherboard
Click to expand...

Or maybe it's the BIOS after all. https://www.hwcooling.net/en/gigabyte-fixes-pcie-lanes-issue-on-boards-with-geforce-rtx-50/

That guys specifically mentions Gigabyte X870 Aorus Elite WIFI7 and that the F5a bios is supposed to fix the PCI lanes issue. The only difference is he mentions that the number of active lanes before the fix didn’t remain consistent and could change with every system reboot, while mine is consistently stuck at x4.
 
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gregorius11 said:
Or maybe it's the BIOS after all. https://www.hwcooling.net/en/gigabyte-fixes-pcie-lanes-issue-on-boards-with-geforce-rtx-50/

That guys specifically mentions Gigabyte X870 Aorus Elite WIFI7 and that the F5a bios is supposed to fix the PCI lanes issue. The only difference is he mentions that the number of active lanes before the fix didn’t remain consistent and could change with every system reboot, while mine is consistently stuck at x4.
Click to expand...
Yes I did mention updating the bios earlier I assumed you had already done it.
 
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im experiencing the exact same issue here, unfortunately I reseated it multiple times, and did all the bios updates and drivers on a fresh build. Still unstable when running gen 5, and only works on gen 4. Also ssd in the correct slots to avoid bandwidth sharing, and its directly in the slot without any riser cables.

With gigabyte support, and they lead me on until they try to redirect me to the local dealer. Anyone else having similar issues?

Surely it's not a hardware fault specifically with me if others are reporting similar issues..
 
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