GPU stuck at PCIe x8 instead of x16

[rylo123]

I just wanted to share what I ran into recently in case it helps anyone else pulling their hair out over PCIe link speeds.

• Motherboard: ASUS PRIME B760-PLUS D4
• CPU: Intel i7-14700F
• GPU: (installed in the top PCIEX16 slot, labelled G5 in BIOS) 4090
• SSD: M.2 NVMe in the top M.2_1 slot (above the GPU)

I noticed in GPU-Z and HWiNFO that my GPU was only running at PCIe 4.0 x8, not x16. This was the case even when the GPU was under load.

So I:

• Updated BIOS and drivers.
• Checked the BIOS — PCIEX16 (G5) was on Auto so I changed it to Gen 4.
• Still stuck at x8.
• M.2_1 was showing x4.
• Reseated the GPU multiple times
• Moved the SSD to a different M.2 slot
• Tried running with no SSD at all
• Checked the slot and GPU for dust or damage

How can I fix this.

This is the link to the manual of the motherboard: https://www.asus.com/uk/motherboard...helpdesk_manual?model2Name=PRIME-B760-PLUS-D4

My Bios:

https://imgur.com/a/thTCMvp

 

[maxmax123]

Yeah I have the same issue with. Im 99% sure my problem is bad CPU contact pins. I would try that if it bothers you.