I expected something like this. A not "fully tested on AMD CPUs" patch put out by Microsoft to fix an Intel CPU hardware problem.

They indicate they will not automatically update AMD PCs with the patch -- until they can provide a patch that doesn't break things on AMD machines. But, it may still slow down AMD unnecessarily, I imagine.

Quote
Microsoft withdraws Spectre and Meltdown patch that's borking AMD machines

"Microsoft has reports of customers with some AMD devices getting into an unbootable state after installing recent Windows operating system security updates," the company claimed.

"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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