B350M Bazooka with Ryzen 5 1600 gives poor USB write speeds and crazy CDM benchmarks - CPUs, Motherboards, and Memory - Linus Tech Tips
System Performance - The GIGABYTE X399 DESIGNARE EX Motherboard Review
System Performance - The GIGABYTE X399 DESIGNARE EX Motherboard Review
Amazon.com: ASUS PRIME X399-A AMD Threadripper TR4 DDR4 M.2 U.2 X 399 EATX HEDT Motherboard with USB 3.1 Gen2, AURA Sync RGB Lighting and 3D Printing Mounts : Everything Else
Amazon.com: Asus Rog Zenith Extreme Alpha X399 HEDT Gaming Motherboard AMD Threadripper 2 (TR4) EATX DDR4 M.2 10G LAN USB 3.1 Gen2 : Electronics