MSI has a fix for AM5 PCIe GPU throttling issue

MSI has started rolling out a new AM5 BIOS that appears to address the long-running PCIe GPU throttling bug reported by some users on its Ryzen motherboards. The first public fix is BIOS version 7E51v1A81 for the MAG X870 Tomahawk WiFi, and MSI’s own changelog explicitly lists “Fixed PCIe graphics card throttling issue” alongside an AGESA PI pre-1.3.0.0 update.

The issue has been discussed for months across MSI’s forum, subreddit, and community posts, usually as a cold-boot or restart problem where the main PCIe slot would not initialize correctly. Users described cases where the GPU link dropped below the expected mode, while other PCIe devices such as NVMe drives also came up at much lower link speeds than they should have.

Source: MSI

The new BIOS does not confirm the root cause in technical detail, but community posts tied to the update point to a compatibility problem involving the board, BIOS, AGESA branch, CPU, and GPU combination. Early reactions suggest this is the fix many affected users were waiting for, although public testing is still limited and MSI has only posted this exact fix note on the MAG X870 Tomahawk WiFi support page so far.

MSI forum and Reddit threads point to similar behavior on X870E and B850 models, including cases where the primary slot failed to initialize a graphics card properly until the card was moved to another slot or BIOS settings were changed as a workaround.

If you are running a MAG X870 Tomahawk WiFi and have seen random PCIe link drops, failed cold boots, or a GPU stuck below its expected mode, this is the BIOS update to watch. Owners of other AM5 MSI boards will likely need to wait for matching BIOS releases to know whether the fix is rolling out across the rest of the stack.

Source: MSI support changelog , MSI (Reddit) via UNIKO’s Hardware , Wccftech

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