https://wccftech.com/asrock-mini-itx-lga-3647-motherboard-intel-xeon-28-core-cpu-support/

ASRock has been offering some really good small form factor designs on each generation of HEDT processors from Intel and AMD. They have the smallest X299 motherboard (X299-E-ITX AC) around and also the smallest X399 (X399M Taichi) motherboard. Now, ASRock Rack has released the MITX EPC621D4I-2M motherboard which is the smallest C621 chipset based motherboard.

The motherboard “EPC621D4I-2M” which is part of the ASRock Rack Mini-ITX series is a marvel of engineering. It features the LGA 3647 socket which can support Intel’s Xeon Scalable processors. These include the Skylake-SP and Cascade Lake-SP parts. The socket is rated to support up to 205 Watt SKUs so we can exclude the HEDT Xeon W-3175X from the list, however, the rest of the 205W 28 core Xeons are fully compatible with the motherboard.