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We found the Missing Performance: Zen 5 Tested with SMT Disabled
(www.techpowerup.com)
This is a most excellent place for technology news and articles.
For values of "new chips" that include 20 year old ones. Foster was released 2001, the chips were single-core but you could have up to eight on a board so it's still multi-core SMT. First on-die multi-core SMT seemed to have been Paxville, 2005.
Or maybe Windows server has a proper scheduler and they never bothered bringing it to desktops?