[TeMPOraL]

Correction: it's on the chipset, not CPU itself:

https://en.wikipedia.org/wiki/Intel_Active_Management_Techno...

Still, it runs out-of-band, it can be accessed even if your computer is turned off, as long as it's plugged in to a power source.

[ionised]

I'm guessing this is something that cannot be disabled in the BIOS/UEFI?

* EDIT * Actually, it looks like you can.