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).)
