Z890 Chipset and PCI-E 5.0 NVMe Drives

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   Hi all new to the forum and figured this is probably the easiest way of getting my question answered.

So I am looking at building a DIY gaming rig and was originally looking at a Z790 i9-14900 solution but then delved further into the limitations of the PCI-E 5.0 support on that chipset with regard that running a PCI-E 5 NVMe SSD would mean that the graphics card in the X16 PCI slot would be restricted to X8 bandwidth.

After doing some background reading on socket LGA1851 it appeared that this restriction has been removed with the NVME having a dedicated x4 lane to the CPU.

However looking at the specs from motherboard manufactures i am seeing comments along the lines of "The PCIEX16 slot can only support a graphics card or an NVMe SSD" whcih suggests otherwise.

Can someone give me a definitive answer to the question of if I install a Gen 5 NVMe will my graphics card run at the full x16 bandwidth or not.

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Elvorfin Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Oct 2024 Location: UK Status: Offline Points: 20	Post Options Post Reply Quote Elvorfin Report Post Thanks(0) Quote Reply Topic: Z890 Chipset and PCI-E 5.0 NVMe Drives Posted: 23 Oct 2024 at 9:45pm
	Hi all new to the forum and figured this is probably the easiest way of getting my question answered. So I am looking at building a DIY gaming rig and was originally looking at a Z790 i9-14900 solution but then delved further into the limitations of the PCI-E 5.0 support on that chipset with regard that running a PCI-E 5 NVMe SSD would mean that the graphics card in the X16 PCI slot would be restricted to X8 bandwidth. After doing some background reading on socket LGA1851 it appeared that this restriction has been removed with the NVME having a dedicated x4 lane to the CPU. However looking at the specs from motherboard manufactures i am seeing comments along the lines of "The PCIEX16 slot can only support a graphics card or an NVMe SSD" whcih suggests otherwise. Can someone give me a definitive answer to the question of if I install a Gen 5 NVMe will my graphics card run at the full x16 bandwidth or not.

Darkje Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 30 Dec 2022 Status: Offline Points: 1610	Post Options Post Reply Quote Darkje Report Post Thanks(0) Quote Reply Posted: 24 Oct 2024 at 5:12am
	There are 20 pci-e 5.0 lanes in arrow lake, so it should support a 16x and a 4x 5.0 at the same time.