TechPowerUp published a review on the ASRock X399M Taichi
A quote from the article:
We begin our foray into the AMD Threadripper platform with a rather small board product, something one might not expect to be available for AMD's Threadripper platform. ASRock's X399M Taichi takes everything the platform natively offers and fits all that into the mATX platform, so you can get all those cores in a box working on your desk without giving up a good portion of your desk space.ASRock X399M Taichi Review
ASRock launched their Taichi series several iterations ago, releasing a highly refined and purposefully "mainstream" tuned series of boards that offer all the features a platform has to offer, along with robust power delivery and a simple aesthetic that is easy on the eye. As the name implies, the ASRock Taichi boards truly seek to make your computing experience a calming one by also bringing in a BIOS that is ready for most popular memory and drive options to ensure things like compatibility problems are almost completely relegated to the past.