What's the difference between NH-D15 and NH-D15S? : Noctua Knowledge Centre
Really need help with a rabbit hole: Noctua NH-D15 measurements in a 170mm cooler clearance case (fitting G. SKill Trident Z etc) : r/Noctua
NH-D15S Dual Radiator Quiet CPU Cooler
Noctua NH-D15S Heatsink Review - Overclockers
Oddly-Specific PSA: G.Skill's Trident Z memory fits under a Noctua NH-D14 just fine, even though it is not listed for compatibility due to it's 44mm height : r/pcmasterrace
Can Noctua NH-D15S at stock speed keep Intel I7 8700k cool enough | TechPowerUp Forums