The evolution of single-core bandwidth in multicore systems

In April 2023 I posted some results and comments The evolution of single-core bandwidth in multicore processors illustrating the (slow) growth in single-core memory bandwidth over time in Intel and AMD multicore processors.

Here is an update to the summary chart, adding the AMD EPYC 4 (“Genoa”) processors. Genoa delivers about 40% higher single-core read bandwidth than the EPYC 3 “Milan” processors, giving AMD about a 2x advantage over the Intel “Sapphire Rapids” processors. (Note that the Intel “Sapphire Rapids” processors deliver about the same single-core bandwidth whether equipped with DDR5 memory (4th generation Xeon Scalable Processors) or with HBM memory (Xeon CPU MAX Processors).)

Evolution of single-core memory bandwidth in Intel and AMD multicore processors. Intel performance improved very slowly from 2010 to 2020, then had modest boosts in 2021 and 2023. AMD performance has increased much more consistently, with EPYC 4 ("Genoa") delivering about twice the performance of the Intel "Sapphire Rapids" processors (with or without HBM memory). — Measurements of single-core bandwidth for a read-only test case on Intel and AMD multi-core processors. Updated to 2023-12-20.