We have been waiting for AMD Threadripper CPU custom cooling parts to make their way to us. We have our first two purpose-built Threadripper waterblocks from XSPC and Bykski. We put both these coolers to the test with our 4GHz overclocked Threadripper in hour long stress tests to see how our temperatures fare.

Source: [H]ardOCP – AMD Ryzen Threadripper Waterblock Comparison #1