While Simultaneous Multi-Threading (SMT) on Intel/AMD x86 64 processors is limited to providing one additional thread per core, SMT on IBM POWER hardware can provide 4-way and even 8-way SMT for some processor models
While the AMD EPYC 9754 'Bergamo' processor is impressive for having 128 physical Zen 4C cores, it also has Simultaneous Multi-Threading (SMT) to provide for 256 threads per socket.