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Since this exchange, a new SP3 EPYC heatsink contender has appeared: the Arctic Cooling SP3.
It's hench; much bigger than any other SP3 cooler, allowing the use of 120mm fans. It comes with integrated 120mm fans, which are dogshit (two of the four units I bought had faulty fans), so I replaced them with Noctua Industrial 3000rpm.
As you can see, the heatsink has the orthodox orientation for the SP3 EPYC socket. Temperatures are a full 15degC lower than with the previous best Noctua cooler.
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If it becomes a problem, I've found two other options mentioned in a thread here https://forums.servethehome.com/index.php?threads/anyone-confirm-getting-rev-2-epyc-7002-boards.26069/page-2#post-240903