VCZ article reposting a Geekerwan experiment where they machined the CPU heat spreader into a waterblock. In their test, the CPU remained at 52C at 1500W, however, they were using an industrial chiller and a 140L res.

videocardz.com

Threadripper PRO 9995WX $12,000 mod turns heat spreader into a water block, stays under 50°C at 1,550W - VideoCardz.com
Geekerwan machines custom IHS as a waterblock for Threadripper PRO 9995WX Geekerwan has published a new build video on AMD’s Ryzen Threadripper PRO