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Researchers discover potentially catastrophic exploit present in AMD chips for decades
(www.engadget.com)
This is a most excellent place for technology news and articles.
You forget that the CPU has a nanny CPU built in these days.
Which, again, is an incredibly unlikely attack vector unless you have some government secrets on your computer. And chances are that any attack through the IME or PSP is trying to do an implant into the UEFI/BIOS and not the processor itself.