https://wccftech.com/intel-disabling-tsx-on-certain-cpus-skylake-and-coffee-lake-affected/

Intel recently introduced a microcode update to their CPUs earlier this month included in a recent update to it's developer guide. Interestingly, Intel has begun to disable the Transactional Synchronization Extensions (TSX) with this new microcode on certain processor families (on both Windows and Linux) such as Skylake and Coffee Lake CPUs.

Intel Adds High-Bandwidth Memory Support To Xeon ‘Sapphire Rapids’ Server Processors