![]() ![]() As DDR5 continues to evolve rapidly, the 24GB and 48GB DIMM capacities will become more widespread. However, with Intel motherboards embracing the new memory modules, we expect AMD motherboards to catch up soon. Although Corsair and Crucial have unveiled their 24GB and 48GB DDR5 memory kits, only the former's offerings have arrived on the retail market, and they cost an arm and a leg. Presently, there aren't many 24GB and 48GB DDR5 options. Getting past the BIOS screen is progress, but it's evident that there's still a bit of room for optimization. If not, the memory training would fail, and the system will likely refuse to boot. The current AMD AGESA firmware may already support 24GB and 48GB DDR5 memory modules. However, the hardware enthusiast showed that while the system apparently posted OK, it was unable to enter the operating system due to a hardware error. Twitter user MEGAsizeGPU got Corsair's latest Vengeance DDR5-5600 48GB (2x24GB) memory to post on his system powered by a Ryzen 5 7600X and ROG Strix B650E-E Gaming WiFi motherboard. However, there's one thing in common they're all Intel platforms, and there's not even one peep from AMD. On the contrary, ASRock and Asus have released special firmware to usher in support of the new capacities. Whether pushing the speed envelope or capacity threshold, the motherboard plays a vital role.įor example, MSI and Gigabyte claim that their respective Intel 600-series and 700-series motherboards are compatible with 24GB and 48GB DDR5 DIMMs without a firmware update. Faster memory kits will work, but you're on your own, and your mileage will vary. AMD has confirmed that it will be hosting the unveiling of its Ryzen 7000 'Zen 4' CPUs, AM5 platform & DDR5 EXPO memory on the 29th of August. It's similar to the case of the official supported memory speed on processors and Intel XMP or AMD EXPO overclocking. So while higher capacity support (192GB) isn't entirely off the table, it depends on whether your chip can handle it. For example, Intel 12th Generation Alder Lake and 13th Generation Raptor Lake processors and AMD Ryzen 7000 (Raphael) Zen 4 processors officially support up to 128GB of DDR5 memory. EPYC Genoa can handle down to one memmory channel configurations while for this testing the focus was on 6 memory channels and above - simply for not being too memory constrained, reducing the testing burden with having a lot of different tests being limited by this lone EPYC Genoa server at the moment, and the low likelihood of users procuring a higher-tier EPYC 9004 series processor and running in such a RAM limited scenario.It's important to distinguish between what's officially supported and what works. All of the memory was 64 GB DDR5-4800MT/s Samsung M321R8GA0BB0-CQKEG memory modules, kindly supplied by AMD as part of the EPYC Genoa review kit. With the AMD Titanite reference server and dual EPYC 9654 64-core processors, I completed various (mostly real-world focused) benchmarks at 6, 8, 10, and 12 memory channels. So going for 12 DIMMs or even 24 DIMMs for a two socket AMD 4th Gen EPYC server can quickly add up. ![]() The 64GB DDR5-4800 server memory modules are retailing for around $350. Obviously though not all workloads are very memory intensive, so these benchmarks are intended both as a mix of benchmarks showing how the EPYC 9654 2P performance responded under a mix of workloads whether you are trying to gauge if it's worthwhile initially going for 12 (or 24) DIMMs or simply need some independent numbers to help justify the expenditure to your boss/management.įor those that haven't looked at DDR5 server memory pricing, as of writing the cheapest DIMMs I have seen are the Samsung DDR5-4800 16GB memory modules at around $100 USD or $183 USD for the 32GB version. Thus I set out to run some benchmarks over the holidays looking at the EPYC Genoa performance from 6 up through 12 memory channels with these Zen 4 server processors.įor memory intensive workloads the scaling up through 12 channels was there and the EPYC 9654 processors proved they could effectively make use of all twelve memory channels per socket. But the cost of populating all 12 memory channels - especially with initial DDR5 server memory pricing - may be too much to handle at once for some deployments and tougher to justify within organizations during these turbulent economic times. ![]() This is a big upgrade over prior generations of EPYC processors with eight channels of DDR4-3200 memory and what is found with current Xeon Scalable "Ice Lake" processors. In this article is a wide assortment of benchmarks looking at the AMD EPYC 9654 performance across varying numbers of populated DDR5 memory channels.ĪMD 4th Gen EPYC processors support twelve DDR5 memory channels at DDR5-4800 speeds and can handle up to 6TB of addressable memory per socket. In addition to the big performance uplift from AVX-512, up to 96 cores per socket, and other Zen 4 architectural improvements, also empowering the EPYC 9004 "Genoa" processors is the support for up to 12 channels of DDR5-4800 memory. ![]()
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