MPG z890 carbon WiFi PCIe lanes problem

jaku12a802aa

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Apr 9, 2025
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Hello everyone

Can someone pleas help, I can't figured out. Mb power saving thing, on full load rendering I mb use 15% bandwidth 8x5.0. I will test in game.

I deal with problem about PCIe lanes. I have GPU MSI Rtx 5080 gaming trio oc and it's run only on PCIe 8x 5.0 lanes. I can't figure it out how to enable PCIe 16x 5.0. On Board manual is writen, can support 2* 4 lanes NVMe PCIe 5.0 and PCIe 4.0 and GPU PCIe 16*5.0 simultaneously. 24 lanes total. My CPU intel ultra 7 265 k support 24 lanes too.

My System info is MB: MSI MPG z890 carbon WiFi CPU: Intel ultra 7 265k Ram: Kingston FURY 48GB KIT DDR5 8400MT/s CL40 CUDIMM Renegade Silver XMP GPU PCI_E1: MSI Rtx 5080 gaming trio oc SSD M.2_1: Samsung 990 pro 1T SSD M.2_2: Samsung 990 pro 2T SSD M.2_3: Samsung 990 pro 2T

Pls help what to do. I tried to remove GPU reinsert it few time, don't help. It's all new staff. First time run. If I change in bios PCI_E configuration on 16x nothing change. Still is showed in GPUZ or in Nvidia System info 8x PCIe lanes can't be ocupated with SSD becous there is enoght lanes on MB and CPU
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First remove the gpu from the motherboard then perform a CMOS reset and then install the GPU back in but make sure you are installing it in the correct PCI-E slot i.e. PCI_E1 which is the primary slot can use full x16*5.0 bandwidth but if you are installing it in lower slot PCI_E2 which is secondary slot that runs at x8*5.0 speed.

I think you have used secondary pci-e slot for installing a 5080 which explains why you are seeing only x8 link in software like GPU-Z or in Nvidia control panel. So, as per the block diagram you have posted it can be clearly seen that the primary slot has full x16 link which runs in x8 mode only if lower secondary slot is being used.
 
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