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The short answer:
Almost every modern desktop motherboard supports PCIe 4.0 somewhere.
In 2026, the real question is whether your GPU and M.2 slots run at
PCIe 4.0 or PCIe 5.0—and whether the extra Gen5 bandwidth matters.
Last updated: September 2, 2026
PCIe 4.0 used to be a feature you specifically shopped for.
That is no longer the case.
On current AMD AM5 and Intel desktop platforms, PCI Express 4.0 is essentially a baseline connectivity standard. Some motherboard slots run at PCIe 4.0, others at PCIe 5.0, and lower-priority expansion slots can run at still slower generations.
That last point is important: a motherboard does not have one single PCIe version.
One board can simultaneously have:
- a PCIe 5.0 x16 graphics slot,
- a PCIe 5.0 x4 M.2 socket,
- two PCIe 4.0 x4 M.2 sockets,
- a physical x16 expansion slot wired at PCIe 4.0 x4,
- and smaller chipset-connected slots using another configuration.
So if you are checking whether a motherboard supports PCIe 4.0, the next question should always be: which slot?