I am presuming that Microsoft will limit CPU versions via the microcode they and intel bodged, http://www.theregister.co.uk/2015/08/11/memory_hole_roots_intel_processors/
"Old" hardware won't get an fixed MS microcode on newers OS and they prevent the hardware vendors releasing their own version. You can bet some of the microcode contains MS validation methods that produce spurious errors under windows and optimisations that are not enabled by default in the hardware vendors microcode, so yes it will continue to effect "other OS" in terms of only hardware vendors optimisations for old and non-microsoft. The solution is ofc to run the old windows in a VM and if AMD and Intel are stupid enough to allow themselves to be limited on non-MS OS then they deserve go under.
Seriously time for these fools to loose all their patents so someone with integrity can make their unhampered replacement
Biting the hand that feeds IT
