> From what I gathered on IRC #talos-workstation, the quad-core has a TDP
> of 90W, the octa-core 190W TDP. Both of them can clock up to about 4 GHz

Now official:

4-core POWER9: 3.2 GHz base, 3.8 GHz turbo, 90W TDP
8-core POWER9: 3.45 GHz base, 3.8 GHz turbo, 160W TDP