Intel's next-generation Xeon Scalable processors (codenamed: Emerald Rapids) and their successors will cease support of the company's Optane Persistent Memory (PMem) modules, according to the company's own PerfMon tool, as discovered by InstLatX64. Apparently, Intel is now betting on CXL 2.0 memory expansion modules.
Intel's Emerald Rapids heavily relies on technologies developed for Sapphire Rapids, as it uses the same high-performance microarchitecture and shares the platform. That said, removing Optane Persistent Memory support looks to be a business, rather than a technological, decision. Keeping in mind that Intel will stop officially supplying Optane Persistent Memory modules on Dec. 29, 2023, it is logical not to support it on products that ramp in 2024.
The decision to drop support for Optane Persistent Memory modules from the 5th Generation Xeon Scalable processors is not unexpected — in fact, it makes perfect sense. Intel's Emerald Rapids processor is set to support CXL 2.0 type 1, type 2, and type 3 devices — including CXL Attached Memory, which is the direct successor of Intel's Optane Persistent Memory modules. Furthermore, EMR CPUs support the same CXL Attached Memory modes as do SPR processors with Optane PMems, probably because Intel uses the same controller IP. Yet, it hardly wants to validate its outgoing product line with all-new CPUs and hopes to sell its written off Optane inventory in the coming quarters.
Formally, Intel's Emerald Rapids and subsequent generations of Xeon processors will continue to support Optane solid-state drives as they use industry-standard interfaces and can be plugged into new machines seamlessly. That said, we are not sure how many vendors will validate their work with newer datacenter/workstation platforms, so we have little chances to see many future Xeon-based machines outfitted with Optane SSDs.
Anyway, with Intel axing support for Optane Persistent Memory products in its 5th Generation Xeon Emerald Rapids processors, we can once again bid adieu to the technology and welcome upcoming products with CXL support.
