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(2018)

And "x86" sort of gives the wrong impression -- this isn't an AMD or Intel chip; it's a 2001-era VIA chip.

Intel chips also have a hardware backdoor in the form of a separate core that the neither the user nor the installed operating system control.

Intel Management Engine:

As do AMD chips:

AMD Platform Security Processor:

Irrelevant. The IME/PSP are not described in this article and function differently.