Fun fact, one of the effects of the memory shortage is that even SMT2 is now being widely disabled.
When running typical server loads, each instance you run requires the same amount of working memory regardless of how fast it is running. If you have SMT, the throughput per core is higher, but the throughput per gigabyte of memory is lower, because tasks take longer to complete. So by turning SMT off you slightly reduce the efficiency of cpu use, but improve the efficiency of ram use. And guess which one is more expensive right now.