> ...The core-to-core latency within a quadrant this generation has improved from a worst-case 112ns to 99ns, about a 10ns improvement. Access to remote quadrants has been reduced from up to 142ns to up to 114ns, which is actually a 24% improvement, which is considerable.
> What’s really interesting is that inter-socket latencies have also seen very notable reductions. Whereas the Rome part these went up to 272ns, the new Milan part reduces this down to 202ns, again a large 25% improvement between generations.
Good I/O is going to have a cost in terms of die area and power. Granted what Anandtech observed is interesting for 2P systems. Maybe there's a NPS4 vs NPS1 difference at work here, or AMD just isn't doing as much power gating on the IOD as it could in one or either case.
> What’s really interesting is that inter-socket latencies have also seen very notable reductions. Whereas the Rome part these went up to 272ns, the new Milan part reduces this down to 202ns, again a large 25% improvement between generations.
Good I/O is going to have a cost in terms of die area and power. Granted what Anandtech observed is interesting for 2P systems. Maybe there's a NPS4 vs NPS1 difference at work here, or AMD just isn't doing as much power gating on the IOD as it could in one or either case.