I am no stranger to NUMA since SGI days, and AMD EPYC is a ccNUMA. If I read it correctly, 512- and 768-bit wide memory bus is available to access the socketed

I am no stranger to NUMA since SGI days, and AMD EPYC is a ccNUMA. If I read it correctly, 512- and 768-bit wide memory bus is available to access the socketed CPU's local memory only (which is relatively small), and access to the shared memory (which is large to very large) seems to be still via a switched Infinity Fabric memory controller. How wide is the Infinity Fabric nowadays? I can't easily find the conclusive evidence.