AMD processors aren’t affected by the devastating Meltdown CPU flaw, but the emergency fix for Meltdown and Spectre can apparently bring certain AMD CPUs to their knees. Microsoft has stopped offering the Windows security patch to some AMD systems after reports of PCs not booting.

“After investigating, Microsoft has determined that some AMD chipsets do not conform to the documentation previously provided to Microsoft to develop the Windows operating system mitigations to protect against the chipset vulnerabilities known as Spectre and Meltdown,” Microsoft’s security advisory reads. “To prevent AMD customers from getting into an unbootable state, Microsoft will temporarily pause sending the following Windows operating system updates to devices with impacted AMD processors at this time.”

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