`Moving the incredible amount of #data generated by 528 threads around the die requires an optimized interconnect, so #Intel designed a 2D on-die mesh with 16 routers to shuffle data between the cores, memory controllers, and #silicon photonics #interconnects (eight routers are integrated into the #CPU cores, while six routers are dedicated entirely to just data movement). `

https://www.tomshardware.com/news/intel-demoes-8-core-528-thread-puma-chip-with-1-tbs-silicon-photonics

Intel Demos 8-Core, 528-Thread PUMA Chip with 1 TB/s Silicon Photonics

7nm chip has 66 threads per core and pushes 1 TB/s of optical I/O.

Tom's Hardware