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PCIe 3.0 x4 NVME Drive in PCIe 4.0x1 Slot

metaleggman
By metaleggman
in Storage Devices
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Go to solution Solved by Eigenvektor,

It would run at PCIe 3.0

 

The slowest link determines the speed. It doesn't matter if your motherboard supports PCIe 4.0, if the NVMe only supports PCIe 3.0. It'll not magically speak the newer protocol. So the motherboard will fall back to PCIe 3.0.

Posted

I'm trying to remember how the speed negotiation works for PCIe.  My motherboard has 3 PCIe 4.0 x1 slots.  If I adapted a PCIe 3.0 x4 NVME drive to one of these (say, if I replaced my second NVME drive, and wanted to reuse my old drive somehow), would it simply have the bandwidth of PCIe 4.0 x1, or would it negotiate it down to PCIe 3.0 x1?

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Posted
  • Solution

It would run at PCIe 3.0

 

The slowest link determines the speed. It doesn't matter if your motherboard supports PCIe 4.0, if the NVMe only supports PCIe 3.0. It'll not magically speak the newer protocol. So the motherboard will fall back to PCIe 3.0.

Remember to either quote or @mention others, so they are notified of your reply

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A NVMe on pcie3 x1 will have its bandwidth cut by 3/4 and will perform no better than a SATA SSD, it's not a sensible setup 

System : AMD R9 5900X / Gigabyte X570 AORUS PRO/ 2x16GB Corsair Vengeance 3600CL18 / ASUS TUF Gaming AMD Radeon RX 7900 XTX OC Edition GPU/ Phanteks P600S case /  Eisbaer 280mm AIO (with 2xArctic P14 fans) / 2TB Crucial T500  NVme + 2TB WD SN850 NVme + 4TB Toshiba X300 HDD drives/ Corsair RM850x PSU/  Alienware AW3420DW 34" 120Hz 3440x1440p monitor / Logitech G915TKL keyboard (wireless) / Logitech G PRO X Superlight mouse / Audeze Maxwell headphones

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