He's not using it for gaming or oc'ing it. No way he needs liquid cooling. Actually the stock heatsink would work fine.
Conclusion: A VRM Heatsink That Isn’t Garbage
EVGA’s PCH fan placement, although limited in its impact to VRM thermals, is brilliant: The fan is able to provide some marginal amount of airflow to the secondary part of the VRM heatsink, ensuring that hot air doesn’t remain trapped under the IO shroud. Finning the VRM heatsink also means that the board is able to operate almost entirely without direct VRM cooling, which means no VRM throttling in our testing. We tested up to 4.5GHz at 1.24V in open air, and found that the heatsink alone was largely sufficient. Placing this into an enclosure would benefit from the VRM fans, but you could run them at lower (~4000) RPMs to help with noise management.
"EVGA has done well with the X299 DARK. The BIOS still needs work, and we’re actively analyzing the PCB and VRM, but the cooling is best-in-class. EVGA has no competition right now, at least for VRM heatsinking. We wish EVGA would consider transplanting this board design over to Threadripper, but in a world of aesthetics-first heatsinks, we’ll take what we can get. Job well done on the heatsink, certainly."
"This CPU Cooler is a 135mm air-cooled model. While liquid CPU coolers are more generally more effective, they are most often not necessary in environments using stock clockspeed and voltage settings.
"Air coolers however, provide an extremely reliable solution, while minimizing risk of failure. In the event that the CPU fan dies, the case cooling fans provide enough secondary airflow to keep the system running long enough to get a replacement fan. This is not possible with water cooling."