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Why we don't have 128-bit CPUs
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
And as I said, it could still be enabled with a boot switch.
It's not like all distros in 1999 had PAE enabled by default. You had to find a pae enabled kernel.
And Linux PAE has been buggy off and on for 20 years:
"It worked for a while, but the problem came back in 2022. "
https://flaterco.com/kb/PAE_slowdown.html