F5F Stay Refreshed Hardware Desktop PCIe lanes remain locked at one lane in a 16-pin slot

PCIe lanes remain locked at one lane in a 16-pin slot

PCIe lanes remain locked at one lane in a 16-pin slot

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alvinmrb
Member
54
11-02-2021, 05:43 AM
#1
Hello community, I recently added a new graphics card to my system (5070) and downloaded the newest drivers from Nvidia. After restarting everything, the card appears in PCIe 1x 3.0 speed. Previously, I had a 2070 Super in the same slot, running at 3.0 x16. I’m puzzled as to why the motherboard isn’t auto-detecting x16. I checked the BIOS and tried forcing it, but only got 3.0 x8 across both PCIe lanes. I can also use 3.0 x8, 3.0 x8 across, or 3.0 x4. I updated the BIOS to the latest version (F11 i9 10900kf Gigabyte Aorus Master Z590 32GB Corsair Dominator DDR4 2100-3200 XMP 800W PSU), and the card is working fine in 3.0 x16 mode. However, when I reboot without saving changes in BIOS, it reverts back to 1x 3.0. I’ve tried reseating the card or reinstalling the BIOS from a USB drive, but it always comes back to 1x. I’d rather avoid going into the BIOS and risk losing data. Any suggestions would be appreciated?
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alvinmrb
11-02-2021, 05:43 AM #1

Hello community, I recently added a new graphics card to my system (5070) and downloaded the newest drivers from Nvidia. After restarting everything, the card appears in PCIe 1x 3.0 speed. Previously, I had a 2070 Super in the same slot, running at 3.0 x16. I’m puzzled as to why the motherboard isn’t auto-detecting x16. I checked the BIOS and tried forcing it, but only got 3.0 x8 across both PCIe lanes. I can also use 3.0 x8, 3.0 x8 across, or 3.0 x4. I updated the BIOS to the latest version (F11 i9 10900kf Gigabyte Aorus Master Z590 32GB Corsair Dominator DDR4 2100-3200 XMP 800W PSU), and the card is working fine in 3.0 x16 mode. However, when I reboot without saving changes in BIOS, it reverts back to 1x 3.0. I’ve tried reseating the card or reinstalling the BIOS from a USB drive, but it always comes back to 1x. I’d rather avoid going into the BIOS and risk losing data. Any suggestions would be appreciated?

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DreadLord0203
Junior Member
6
11-07-2021, 02:27 PM
#2
Are there more symptoms than just the single occurrence? The GPU might save power by running at a lower setting, switching to 16x when rendering begins. If games still function properly and maintain around 5070 FPS with your CPU, it could simply be power optimization without any issues.
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DreadLord0203
11-07-2021, 02:27 PM #2

Are there more symptoms than just the single occurrence? The GPU might save power by running at a lower setting, switching to 16x when rendering begins. If games still function properly and maintain around 5070 FPS with your CPU, it could simply be power optimization without any issues.

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Kurogano
Member
183
11-07-2021, 05:05 PM
#3
Absolutely, I'm in agreement. Checking the PCIe lane settings in GPU-Z can trigger a test and may display updated specifications.
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Kurogano
11-07-2021, 05:05 PM #3

Absolutely, I'm in agreement. Checking the PCIe lane settings in GPU-Z can trigger a test and may display updated specifications.

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Dillon451
Junior Member
15
11-07-2021, 05:34 PM
#4
The lane assignment isn't adjustable dynamically. The system can modify generation, but lane count remains fixed. Lanes are permanently assigned at each post.
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Dillon451
11-07-2021, 05:34 PM #4

The lane assignment isn't adjustable dynamically. The system can modify generation, but lane count remains fixed. Lanes are permanently assigned at each post.

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JoshiPlaysMC
Junior Member
18
11-07-2021, 07:25 PM
#5
If it's powering up in 1X only, pull the card back out and make sure that you plugged it into the x16 slot fully. To me this seems like a connection issue, either not fully seated in the slot, or insufficient power, so the card is just behaving as though it has a bad connection. Failing that, go into the BIOS and just force it to operate at Gen 3 instead of Auto. Maybe the GPU has the wrong firmware on it.
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JoshiPlaysMC
11-07-2021, 07:25 PM #5

If it's powering up in 1X only, pull the card back out and make sure that you plugged it into the x16 slot fully. To me this seems like a connection issue, either not fully seated in the slot, or insufficient power, so the card is just behaving as though it has a bad connection. Failing that, go into the BIOS and just force it to operate at Gen 3 instead of Auto. Maybe the GPU has the wrong firmware on it.

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gamerpgf
Member
175
11-18-2021, 10:45 AM
#6
Performance drops significantly in games at 1x scale. For instance, in BF6 the FPS ranges from 20 to 30, whereas in 8x it's about 140. The issue remains consistent across different settings, staying stuck in CPU Z during rendering tests. Very odd.
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gamerpgf
11-18-2021, 10:45 AM #6

Performance drops significantly in games at 1x scale. For instance, in BF6 the FPS ranges from 20 to 30, whereas in 8x it's about 140. The issue remains consistent across different settings, staying stuck in CPU Z during rendering tests. Very odd.

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Cookie0verDose
Member
163
11-18-2021, 12:35 PM
#7
It's odd that flashing the BIOS resets everything and shows 3.0 x 16, yet entering BIOS briefly lets you see 3.0 x1 before switching to Windows. Only by erasing the CMOS or updating the BIOS can you access higher modes like 3.0 x8.
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Cookie0verDose
11-18-2021, 12:35 PM #7

It's odd that flashing the BIOS resets everything and shows 3.0 x 16, yet entering BIOS briefly lets you see 3.0 x1 before switching to Windows. Only by erasing the CMOS or updating the BIOS can you access higher modes like 3.0 x8.

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BlackSlayer
Junior Member
25
11-18-2021, 04:24 PM
#8
Here’s a clearer version:
The BIOS flashing process for F7 doesn’t seem to restore settings properly. Clearing CMOS didn’t help much, and entering BIOS still forces it back to 1x 3.0. Switching to PCIE Gen 3 from Auto didn’t fix the issue either. I’m trying to use 16x but can’t get there. I’m considering removing or reinstalling the Mobo drivers.
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BlackSlayer
11-18-2021, 04:24 PM #8

Here’s a clearer version:
The BIOS flashing process for F7 doesn’t seem to restore settings properly. Clearing CMOS didn’t help much, and entering BIOS still forces it back to 1x 3.0. Switching to PCIE Gen 3 from Auto didn’t fix the issue either. I’m trying to use 16x but can’t get there. I’m considering removing or reinstalling the Mobo drivers.

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IgorGGT
Junior Member
33
11-19-2021, 05:10 PM
#9
Displaying a broken screenshot as requested. Here is the correct functionality.
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IgorGGT
11-19-2021, 05:10 PM #9

Displaying a broken screenshot as requested. Here is the correct functionality.

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Noobso
Member
52
11-19-2021, 09:56 PM
#10
It confirms the information in BIOS near the X16 slot details. The render test doesn’t alter it. I’m beginning to suspect a possible CPU damage, perhaps from voltage or power issues that affected the silicone. What I’m certain about is that updating the BIOS to version F7 will reset everything back to defaults and clear CMOS.
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Noobso
11-19-2021, 09:56 PM #10

It confirms the information in BIOS near the X16 slot details. The render test doesn’t alter it. I’m beginning to suspect a possible CPU damage, perhaps from voltage or power issues that affected the silicone. What I’m certain about is that updating the BIOS to version F7 will reset everything back to defaults and clear CMOS.

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