Asus might have just accidentally leaked Intel's upcoming Cascade Lake-X (CSL-X) processors' branding on one of the company's brand-new X299 motherbooard product pages.
The expectations for Cascade Lake-X aren't set very high. The microarchitecture is still trapped on the 14nm process node, and it's the optimization phase of Intel's Process-Architecture-Optimization model. Therefore, Cascade Lake-X will most likely not usher in groundbreaking performance. Early leaks of the 10-core and 18-core models suggest that Cascade Lake-X's improvement over Skylake-X Refresh (SKL-XR) could be less than 10%. However, we can't really confirm that until the final products are out.
According to the listing for Asus' Prime X299 Edition 30, Intel could market Cascade Lake-X under the 10000-series branding, much like its mainstream Comet Lake (CML) chips. It shouldn't come as a complete surprise considering the chipmaker was already at the 9000-series for its Skylake-X Refresh processors. Logically, the next step would be the 10000-series, and the recent Asus listing seems to confirm this.
| Microarchitecture | Branding | Max Cores / Threads | Lithography | PCIe 3.0 | Max Memory | Memory Support | Launch Date |
| Cascade Lake-X* | 10000-series | 18 / 36 | 14nm | 48 | 256GB | ? | 2019 |
| Skylake-X Refresh | 9000-series | 18 / 36 | 14nm | 44 | 128GB | Quad DDR4-2666 | 2018 |
| Skylake-X | 7000-series | 18 / 36 | 14nm | 44 | 128GB | Quad DDR4-2666 | 2017 |
| Broadwell-E | 6000-series | 10 / 20 | 14nm | 40 | 128GB | Quad DDR4-2400 | 2016 |
| Haswell-E | 5000-series | 8 / 16 | 22nm | 40 | 64GB | Quad DDR4-2133 | 2014 |
| Ivy Bridge-E | 4000-series | 6 / 12 | 22nm | 40 | 64GB | Quad DDR3-1866 | 2013 |
| Sandy Bridge-E | 3000-series | 6 / 12 | 32nm | 40 (2.0) | 64GB | Quad DDR3-1600 | 2011 |
*Specifications in the table are unconfirmed
Although many have dubbed Cascade Lake-X as the refresh of the Skylake-X Refresh, the new chips do seem to have some interesting advancements. The Prime X299 Edition 30 seemingly supports up to 256GB of memory, double of what previous X299-based motherboards support. It's safe to assume that Cascade Lake-X will play nice with 256GB of memory, which is a pretty significant upgrade since the last three generations of Intel HEDT (High-End Desktop) chips are only compatible with 128GB of memory. In terms of official memory speeds, we're uncertain at this point if Cascade Lake-X will maintain official support that stops at DDR4-2666.
The other big takeway from the Prime X299 Edition 30's specification table is a hint that Cascade Lake-X may arrive with more PCIe connectivity directly from the processor. Apparently, Cascade Lake features up to 48 PCIe 3.0 lanes, four more than both iterations of Skylake-X. The PCIe lane upgrade will certainly benefit multi-GPU systems and opens the door to massive NVMe SSD arrays as well.
