My current work-in-progress build, with dual Xeon E5-2658 V3's (24 cores/48 threads @ 2.3ghz), 64gb of DDR4 ECC ram, and (temporary) dual R9 390x's. No over the top RGB, no mini-itx minimalism,
Amazon.com: Intel Processor Xeon LGA2011-3 2.30G 25M Proc E5-2650V3 10C DDR4 Up to 2133MHZ BX80644E52650V3 : Electronics
Amazon.com: MACHINIST X99 Dual CPU Socket Motherboard, LGA 2011-V3 Desktop Server Motherboard (Intel i7 5th/6th Gen, PCIe 3.0, DDR4, Dual LAN, Dual M.2, SATA 6Gb/s, E-ATX) for Intel XEON E5 V3/V4 Series
Intel Xeon E5-2670 2.6GHz 8-Core Technology (SR0KX) for sale online | eBay
Amazon.com: MACHINIST X99 Dual CPU Socket Motherboard, LGA 2011-V3 Desktop Server Motherboard (Intel i7 5th/6th Gen, PCIe 3.0, DDR4, Dual LAN, Dual M.2, SATA 6Gb/s, E-ATX) for Intel XEON E5 V3/V4 Series
The Beast - Dual 12 core Xeon w/Titan Xp by remiscs - 2 x Intel Xeon E5-2687W V4, Corsair Obsidian Series 750D ATX Full Tower - PCPartPicker
Titan X499 - Dual CPUs Intel Xeon E5-2600 v4 Broadwell-EP Series 3D / CAD Workstation PC up to 44 cores – Best workstation for 3D Modeling and Rendering