RTX 3080 Ti supports PCIe x8 4.0 interface.
RTX 3080 Ti supports PCIe x8 4.0 interface.
Hi there. It seems your RTX 3080 Ti is only using PCIe x8 instead of x16. The motherboard is the Asus X670E ProArt-Creator, and the manual is available. The GPU is in the PCIEX16_1 slot, while PCIEX16_2 and PCIEX16_3 are empty. With a CPU of 7800X3D you should have 24 free PCIe lanes, but only two NVMe SSDs are installed. Consider checking for any driver updates or BIOS settings that might affect PCIe lane availability.
In the UEFI interface, you'll find options for PCIE16_1 bifurcation settings. It's often set to 'auto', but sometimes you can choose to disable or configure it at 16x. If forcing it doesn't work, the problem might lie with your card.
There seems to be no major problems beyond the reported speed. Often this happens when the motherboard uses the top PCIe lanes for M.2 slots, causing them to split. Review your manual to confirm. With a 3080Ti chipset, performance impact is minimal—so if things run smoothly, you probably don’t need to act. If it still feels slow, consider relocating the M.2 slot or adjusting the BIOS setting to auto. Make sure you verify which slot is shared before making changes.
I had already configured PCIEX16_1 Bandwidth Bifurcation to PCIE X16 Mode in the BIOS, yet nothing altered.
HwInfo displays 8GT/s for GT/s under GPU load via PCIe link speed.
Besides UEFI configurations, the CPU socket could also prevent the IOD from linking to all 16x lanes. Check the pins and underside of the CPU during installation.