Dual Xeon Scalable Overclocking: ASUS WS C621E 'Sage' Workstation Motherboard Announced
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ASUS has quietly announced a new motherboard: the WS C621E SAGE (or just 'Sage' for short). This workstation class board offers users dual Intel LGA-3647 sockets with CPUs up to 205W each, which should support the full lineup of Intel Xeon Scalable processors using Skylake-SP cores. This should mean dual processor support for Bronze CPUs through Platinum CPUs, allowing up to 56 cores (112 threads) in a single system, but also with numerous extras in PCIe and storage. The Sage also supports up to 12 DDR4 RDIMM or LR-DIMM ECC modules with a capacity of 768GB per socket, 1.5TB total, and speeds supported to DDR4-2666.
Aside from drooling over such a system, one of the stand-out features listed for the Sage is its ability to overclock both CPUs. We have been told by Intel that none of the Xeons are overclockable, which usually means that the CPU multiplier is not adjustable. ASUS hasn't released any details on the overclocking capabilities, however there are two ICS chips on the board which are usually attached to motherboards that offer significant base clock frequency adjustment, so our current thoughts are it will be using BCLK adjustments for overclocks. BIOS redundancy did not make it on the Sage as there is only a single BIOS chip on the board.
There are seven total PCIe slots with three in x16 mode, two in single x16 or dual x8/x8, and two more at x8 mode (likely x16/x8/x16/x8/x16/x8/x16) from the processors. The dual socket system is able to use PCIe lanes from both CPUs, however only one can have a DMI to a chipset.
Partially hidden below the chipset heatsink is an interesting addition to a motherboard - an FPGA. This is a Lattice FPGA chip (LCMXO2-1200UHC-4FTG256C), which appare
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