There has been a lot of confusion regarding PCIe 4 compatibility on the older 2nd Gen Ryzen motherboards. AMD made it clear that it wouldn’t support the new standard on X470 and B450 boards, but Biostar has taken matters into its own hands and enabled it on older Ryzen motherboards anyway.

Biostar isn’t the first OEM to go against AMD’s announcement. Earlier Asus also rolled out BIOS patches to enable the functionality. However, both the vendors will be supporting the newer PCIe standard on the x16 and M.2 slots. Earlier, some boards were having an issue which would cause the x16 slots to run at x8 mode with PCIe 4 enabled. It’s not certain whether the same will be the case for the Biostar motherboards.

However, don’t get too excited. AMD will probably disable PCIe 4 support on all the older boards via an AGESA update. You’ll either have the option to stick with PCIe 4 but older BIOS versions or migrate to newer firmware and get potential performance boosts and bug fixes but lose the PCIe 4 support. In our opinion, it’s better to go with the latter as right now even it’s hard to saturate even the PCIe 3 standard, so the newer iteration doesn’t really provide any notable improvement.

Model
BIOS Revision
X470GT8
X47AG718.BST
X470GTN
X47AK718.BSS
B450MH
B45CS718.BSS
B45M2B35GS718.BSS

The four Biostar motherboards to support the newer standard include the X470GT8, X470GTN, and two B450 boards namely the B450MH and the B45M2. Other than these four, the vendor has a bunch of other Zen+ boards but it seems like they weren’t deemed fit for the update.

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