You gots to be kidding me right? How much?
ASUS formally launched its Republic of Gamers (ROG) Dominus, the sole available motherboard option for Intel Xeon W-3175X unlocked quasi-HEDT processor. Cowcotland scored its price in the old continent to be a whopping 1,550€, making it the most expensive client-segment motherboard (at least in the past 20 years of PC history).
Built in the SSI-EEB form-factor, this board is designed for overclocking the 28-core/56-thread Xeon chip, which is capable of pulling over 1000W of power (just the CPU) under extreme overclocking. The processor itself is priced around 3,100€ including VAT. Add a matching hexa-channel DDR4 memory kit such as these Trident Z Royal ones, and your platform cost could easily touch 5,500€.