ASUS Rog Strix Z490-E PCIEX16_1 remains stuck on x2 instead of x16
ASUS Rog Strix Z490-E PCIEX16_1 remains stuck on x2 instead of x16
Hello everyone, My PCIEX16_1 port remains stuck at x2 instead of x16. See screenshot: https://imgur.com/a/y1h9Dd5 Hardware details: ASUS ROG Strix Z490-E (LGA 1200, Intel Z490, ATX) Intel Core i9-10900K (LGA 1200, 3.70GHz, 10-core) Thermaltake Water 3.0 360 ARGB Sync (5.20cm) 4x Corsair Vengeance RGB Pro (16GB, DDR4-3600, DIMM 288) Samsung 970 EVO Plus (1000GB, M.2 2280) on M.2_1 Socket Gigabyte GeForce RTX 3080 GAMING OC (10GB) Samsung 860 QVO (2000GB, 2.5") on SATA6G_1 Samsung 850 EVO Basic (500GB, 2.5") on SATA6G_2 I've tested various solutions online but haven't found a fix. Attempted: Update BIOS Reset default settings (no proper BIOS hard reset) Unplugged and reconnected the RTX3080 Checked PCIEX16_1 slot – appears clean and undamaged, though visibility is tough. Placed RTX3080 in PCIEX16_2 and it works at x8 Removed all SSDs including the M2 Tried with my old GTX1080 on PCIEX16_1 – still stuck at x2 Reinstalled RTX3080 in my original PC, now runs correctly at x16. Swapped CPU onto its slot. SATA Mode is set to RAID instead of AHCI; I need to reinstall the OS to switch, but changing back to AHCI didn't help and I'm unsure why. GPU-Z shows x2 (confirmed initially), rendering test unchanged, Power Saver settings remain enabled. The card is in the second PCIEX16 slot, but GPU-Z displays x8. 3.0. I’m not sure if the memory is faulty. Thanks for your assistance ahead.
It seems your setup might involve some PCI lanes shared between your X16_1 and NVMe drives. This could be influencing performance rather than a simple drop to x2. In your BIOS, there’s likely a menu for PCIe configurations, and your NVMe might have prompted the system to adjust related settings. Since you don’t have GPU options that fully leverage high-end hardware yet, keeping your card in the second slot could be the most practical choice.
Thank you for your message. I’ve considered your points. I tried to remove the M2 and start the system without any SSD or M2, but nothing changed. According to the Asus BIOS/User Manual, the PCIe 16 lane should only be affected when using the Hyper M.2X16 card. On your setup, is the M2 connected to the M2_1 socket? I’m also sure your 2080Ti is running at x16, and I don’t mind a slight difference between x8 and x16. However, placing the card near the PSU could affect airflow, which is important. If there’s any damage to the board, I’d like Asus to handle it.
Yupp, I just added GPU-Z to check and it's showing x16 3.0. That matches what I mentioned—it’s doable and you’ll need to verify your X16 lane is set correctly. Just keep in mind, if you return a warranty claim, it might take a long time to fix the issue. Was that the link you were following? lol, I didn’t notice it. It seems you were in the right section. After going through the other discussions, I’ll check my BIOS to help you further.
Aight, well though I'm sure you've seen the same thread. On top I ran into all your threads on other sites lol. It really does see that the culprit is going to be a CPU issue. I'm not going to say that you got nail polish on it but maybe there's a bent pin or even just very lightly wipe your cpu down with alcohol. I went into the BIOS and couldn't find anything that I was think would be there. Then i found the menu you were in and mine was at x16 and set to auto. Other than that I got nothing.
Thanks for the help. I plan to verify my CPU and socket again, though I wouldn’t expect any damage to cause the PCIe performance issues to persist.