I would disable it. This also requires software support and, in fact, only some applications use it. System wide it's a hit or miss when it comes to improving performance. Besides, Windows 10 as moved on to TSC and TSC + LAPICs.
p.s.: just to add that invariant TSC is present since nehalem. So this xeons support it.
Last edited by croky; 09-19-2019 at 03:38 AM.