Hardware Intel Xeon Scalable Cascade Lake Next Up

eva2000 · Jul 10, 2018

Intel Xeon Scalable Skylake processors are the current flagship enterprise Intel processors. But next generation Intel Xeon Scalable Cascade Lake is next up with up to 28 cpu cores and will use the same Intel Purely platform as Intel Xeon Scalable Skylake cpus Next-Gen Intel Cascade Lake 28C Supporting 3.84TB Memory

Current Intel Xeon Scalable Skylake-SP CPUs are limited to 768GB of memory with 1.5TB of RAM being addressable by “M” series SKUs. These “M” SKUs are variants of standard chips which can support 12x 128GB per CPU for a total of 1.5TB of RAM. We covered in our Intel Xeon Scalable Processor Family SKUs and Value Analysis that Intel charges a $3000 premium for these high-memory parts.

The new Intel Xeon Scalable platform released in 2017 is called Purley. The Purley platform, like other previous generation platforms from Intel, is designed to support at least two generations of CPUs. Skylake is the first and current generation. Cascade Lake will be the next generation. The Purley platform features six-channel memory with up to two DIMMs per channel.

Originally, the Purley platform with the Skylake generation was slated to support Intel Optane Persistent Memory DIMMs in the higher-end SKUs (e.g. Xeon Platinum) but that support was punted to the Cascade Lake generation.
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Intel Optane Persistent Memory will be interesting though - imagine 3840-7680GB of memory access

Intel disclosed what we expect to be the most popular configuration, six standard DIMMs and six Optane Persistent Memory DIMMs per socket. This six and six configuration makes sense as we do not expect systems to run with only Optane DIMMs for write endurance purposes. Now that we have the Optane Persistent Memory DIMM capacities of up to 512GB, it is easy to extrapolate what this means for the high-end popular configuration.

With 6x 512GB DIMMs per socket, that means that systems will have up to 3TB of Optane per socket, or up to 6TB available in a standard dual socket server. With six sticks of 128GB RAM per socket, that is 768GB. Combined, we get 512GB * 6 + 128 * 6 = 3840GB of memory in DIMM slots per CPU or 7680GB in a dual socket server. That is a 2-4x capacity increase over current generation servers. This is still assuming 128GB DIMMs. We have heard of 256GB DDR4 DIMM development, but those are not generally available at this point.
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Hardware Intel Xeon Scalable Cascade Lake Next Up

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