ASUS has an in-depth writeup about its new X399 Threadripper motherboards. The ROG Zenith Extreme, ROG Strix X399-E, and Prime X399-A are outlined
Specs are as such:
Worth mentioning, we posted this MSI video last week, but gives you a peek about how robust the socket system is for Threadripper.
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Source: [H]ardOCP – ASUS Releases New Threadripper X399 Motherboards