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That means that their platform, known as WRX80, includes a chipset that expands system I/O (where EPYC typically doesn't use a chipset.) The specific platform on which these Threadripper PRO chips were tested is apparently known as Boulder Gulch.
Source: https://hothardware.com/news/threadripper-pro-7985wx-benchmark-leak
With Siena, AMD says it has "put a bow on its EPYC portfolio."