AMD EPYC 9005 Series Memory Scaling Performance From 4 To 24 DDR5 RDIMMs
With today's memory prices, a frequent question at Phoronix and throughout many organizations is about reducing cost by not necessarily populating all memory channels. Especially with modern servers going up to 12 memory channels per socket or even 16 memory channels with upcoming EPYC Venice, you may be curious about the performance impact of populating less memory channels to see if the…
AMD's EPYC 9005 series offers memory scaling performance from 4 to 24 DDR5 RDIMMs. With DDR5-6400 RDIMM prices, many seek to reduce costs by not populating all memory channels. Using a Dell PowerEdge R7725 server, benchmarks were conducted to test the performance impact of populating between 4 and 24 DDR5-6400 RDIMMs. The server was equipped with two AMD EPYC 9655 2P processors and Hynix HMCG94AHBRA480N 64GB DDR5-6400 RDIMM memory modules.
The memory modules, priced at $8,260.92 USD each, would cost around $198,240 USD for a full load-out of 24 modules. The benchmarks, carried out on Ubuntu 26.04 LTS with the Linux 7.0 kernel, aimed to provide reference numbers across various workloads for assessing the performance impact of 4, 8, 10, 12, 16, 20, and 24 memory channels without software/hardware changes. Dell provided free remote access for these tests.
Written by urgent.news from Phoronix's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
