Intel’s upcoming Core Ultra “Arrow Lake-S” desktop processor introduces a new socket, the LGA1851, alongside the new Intel 800-series desktop chipset. We now have some idea what the 151 additional pins on the new socket are used for, thanks to a leaked platform map on the ChipHell forums, discovered by HXL. Intel is expanding the number of PCIe lanes from the processor. It now puts out a total of 32 PCIe lanes.
From the 32 PCIe lanes put out by the “Arrow Lake-S” processor’s system agent, 16 are meant for the PCI-Express 5.0 x16 PEG slot to be used for discrete graphics. Eight are used as chipset bus, technically DMI 4.0 x8 (these are eight lanes that operate at Gen 4 speed for 128 Gbps per direction of bandwidth). There are now not one, but two CPU-attached M.2 NVMe slots possible, just like on the AMD “Raphael” and “Granite Ridge” processors. What’s interesting, though, is that not both are Gen 5. One of these is Gen 5 x4, while the other is Gen 4 x4.