Asus Prime X299 Edition 30 product page points to Cascade Lake-X branding and support for 256GB of memory and 48 PCIe 3.0 lanes.
Intel's Cascade Lake-X CPUs Might Use 10000-Series Branding, Support More RAM and PCIe 3.0 Lanes : Read more
Intel's Cascade Lake-X CPUs Might Use 10000-Series Branding, Support More RAM and PCIe 3.0 Lanes : Read more