Question The Z890 (e.g. Gigabyte Z890 UD) supports PCIe 5.0 for GPU _or_ M.2 but not both?

[timg11]

The Gigabyte Z890 UD manual says "1 x PCI Express x16 slot, supporting PCIe 5.0 and running at x16 (PCIEX16) * The PCIEX16 slot can only support a graphics card or an NVMe SSD. If only one graphics card is to be installed, be sure to install it in the PCIEX16 slot."

The M2A_CPU connector is the only one that supports PCIe 5.0: "1 x M.2 connector (Socket 3, M key, type 25110/22110/2580/2280 PCIe 5.0 x4/x2 SSD support)"

Does that mean that if a GPU is installed in the PCIEX16 slot (the typical configuration), the M.2 connector M2A_CPU would not be available for a PCIe 5.0 SSD?

 

[bill001g]

First it likely doesn't matter. The testing they did on 4090 can run on pcie3 x16 or pcie4 x8. I doubt a 5090 is going to be even twice the bandwidth which means it would run on pcie 5 x8.

Since it is a key selling feature of the z890 chipset and the new intel cpu to have 20 pcie 5 lanes from the cpu I bet you can run both. It is just a matter of using the correct combination.
It should have 16 for one pcie slot and 4 for a m.2 slot. Because of issue running this fast these tend to the the connections closest to the CPU. The largest issue I have seen people complain about is pcie5 m.2 device need cooling and if you try to run active cooling on the m.2 it many times is very tight next to large video cards.