Well, it's official: Processor Specifications | AMD
Ryzen 5 3600 6C/12T 3.6 / 4.2 GHz 65W 32MB L3 Cache
Ryzen 5 3600X 6C/12T 3.8 / 4.4 GHz 95W 32MB L3 Cache
Ryzen 7 3700X 8C/16T 3.6 / 4.4 GHz 65W 32MB L3 Cache
Ryzen 7 3800X 8C/16T 3.9 / 4.5 GHz 105W 32MB L3 Cache
Ryzen 9 3900X 12C/24T 3.8 / 4.6 GHz 105W 64MB L3 Cache
which means the rumors were off a bit on freq.