NH-D15 and clearance on motherboard for RAM - CPUs, Motherboards, and Memory - Linus Tech Tips
Noctua NH-D15S CPU Cooler Review: How The Best Got Better - Page 3 Of 5 - Modders Inc
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Noctua Shows Off Updated 'D Series' 140mm CPU Coolers: NH-D15 Gets A Successor
I am happy i went with the NHD15S. I bet if i got the NH-D15 i would have had GPU clearance problems. Temps are pretty good on my i9-9900k. Temps in the
Noctua DH-15 cooler and RAM compatibility - YouTube