Intel plans to make an important disclosure about its client PC platform roadmap next week, but some parts of the presentation have already been leaked by HXL (@9550pro). In fact, for performance PC enthusiasts, Intel's Desktop and Workstation Platforms Roadmap that covers things like Raptor Lake-S Refresh processors for 2023 desktops as well as Sapphire Rapids-64L/112L CPUs set to address high-end desktops and workstations next quarter poses even more interest.
Raptor Lake-S Refresh: Coming in 2023
One of the biggest surprises revealed by the leaked document is that Intel plans to retain its Raptor Lake processors for desktops for another year. Set to arrive in Q3 2023, Raptor Lake-S Refresh CPUs will continue to serve entry-level workstations and desktops for enthusiasts, mainstream users, and commercial desktop PCs.
The leaked roadmap does not reveal any specifications or improvements of the Raptor Lake Refresh processors over existing products, but typically refreshes increased clocks and sometimes features some minor improvements like enhanced power delivery or different turbo boost algorithms. The excerpts from the document also do not disclose whether Intel's 34-core Raptor Lake-S (RPLS-34C) is a part of the RPL Refresh family, but something tells us that this piece of silicon is reserved for workstations.
What does strike the eye about Intel's plans for desktops in the second half of 2023 is the lack of its codenamed Meteor Lake processor that will rely on a multi-tile (multi-chiplet) design. Perhaps, this part is reserved for mobile platforms only or will arrive at desktops sometime in 2024.
Intel's Raptor Lake-S Refresh will continue to rely on Z790, W680, Q670, and various 700-series chipsets. However, we do not have information on whether these new parts will be drop-in compatible with existing motherboards (including those powered by 600-series chipsets).
Sapphire Rapids-64L and Sapphire Rapids-112L: Xeon W-2400 and Xeon W-3400
Intel has not updated its workstation and high-end desktop platforms for about three years now, and today its CPUs released in Q4 2019 – Q1 2020 (and based on the Skylake microarchitecture from 2015) look rather pale, to put it mildly. For those who want a high-end CPU from Intel, the new desktop platform roadmap brings good and bad news.
The good one is that the company plans to introduce its Xeon W-2400 (Sapphire Rapids-64L) and Xeon W-3400 (Sapphire Rapids-112L) offerings for desktop workstations in Q1 2023. The bad news is that Intel essentially abandons its HEDT product lineup and will address this market with Xeon-branded offerings and platforms.
As revealed a week ago, both Xeon W-2400 and Xeon W-3400-series processors will come in LGA4677 packaging and use motherboards based on the Intel W790 chipset.
As far as CPU features are concerned, Intel's Xeon W-2400 will offer up to 24 high-performance cores, 64 PCIe 5.0 lanes, a quad-channel DDR5 memory subsystem supporting up to 2TB of DDR5 memory with ECC, as well as processor base power (PBP) of up 225W. By contrast, Intel's Xeon W-3400 processors will come with up to 56 high-performance cores, 112 PCIe 5.0 lanes, an octa-channel DDR5 memory subsystem supporting up to 4TB of ECC memory, and a PBP of up to 350W.
As for frequencies, the base clocks of all Sapphire Rapids-WS CPUs are pretty low (from 1.90 GHz to 3.20 GHz, depending on the SKU), but Turbo frequencies exceed 4 GHz in most cases. Actual clocks will rely on cooling systems and power limits, so we will see how fast these CPUs are in real life. Many of the Xeon W-2400/W-3400 models will come with an unlocked multiplier and overclockable, so those who want to push these processors to their limits will have such an opportunity. Meanwhile, it does not look like memory will be overclockable (not that one needs it with a quad or eight-channel DDR5 memory subsystem).
Since we are talking about Xeons, these W-2400/W-3400 processors will support all the workstation-grade reliability, availability, and serviceability (RAS) features as well as capabilities like Virtual RAID on CPU (VROC) 8.0 and Intel Volume Management Device (VMD) 3.04.
In addition to increased core count, all-new CPU microarchitecture, PCIe Gen5, and DDR5 support, the new workstation platform from Intel will feature relatively comprehensive and up-to-date I/O capabilities courtesy of the W790 chipset. The new W790 core logic will provide up to 16 PCle 4.0 lanes, up to 12 PCle 3.0 lanes, up eight SATA ports, up to five USB 3.2 Gen2x2 connections, and up to 10 USB 3.2 Gen2 ports. The chip will also integrate Wi-Fi 6E capabilities and support two 2.5GbE PHY controllers. Furthermore, as the W790 is designed for desktop PCs, it will come with HD Audio, MIPI SoundWare, and other features for client PCs.
The W790 chipset does not support PCIe 5.0, Thunderbolt 3/4, or USB 4/4.1, which is a pity. But keeping in mind that it connects to its host CPU with eight DMI Gen4 lanes, this might be a logical move to ensure maximum I/O performance as the chipset already packs quite a bit of bandwidth-hungry interfaces.
Sapphire Rapids-SP: Xeon Scalable on C741
For those who need unbeatable performance, Intel will offer to use its Eagle Stream platform, supporting up to two server-grade 4th Generation Xeon Scalable Platinum, Gold, Silver, or Bronze (Sapphire Rapids-SP) processors. When equipped with two CPUs, the platform will provide up to 112 high-performance cores with Hyper-Threading, 160 PCIe Gen5 lanes, and up to 8TB of 16-channel DDR5 memory per box. In addition, of course, this platform will offer all the RAS and remote management capabilities in the Sapphire Rapids-WS but will naturally not offer any overclocking features.
While Eagle Stream workstations will offer unbeatable number-crunching capabilities, they will rely on the server-grade C741 chipset that does not support modern I/O capabilities. Workstation makers like Dell and Lenovo will equip Sapphire Rapids-SP-based machines with a bunch of extra controllers to make up for a modest chipsets, of course, so this might not be a problem for those who get complete boxes.
More Details About Client PC Platforms to Come
While the desktop part of Intel's plans for 2023 is more or less clear, there are several things that the company will address at its upcoming event for investors. In addition to Meteor Lake, Arrow Lake, and Lunar Lake CPUs coming in the next few years, Intel will likely talk about its plans for discrete graphics, next-generation Thunderbolt based on USB 4.1, Wi-Fi 7, and a bunch of other things that are set to make its platforms more appealing than those of its rivals. So, stay tuned.