I’m not 100% sure why the D15 score slightly better - it could just be down to slightly better thermal transfer, run to run variance, or maybe the iCue service sucking up CPU time. It also performed a bit better at 50% fan, which makes sense since it has additional radiator area. One performance advantage the H150i has is that the initial boost clocks and power draw last several seconds longer, probably due to the extra thermal capacity of the water. Power draw was from 194W (D15 50% fan) to 215W. Average steady state clocks ranged from around 4915 MHZ (D15 50% fan) to around 5070 MHZ. Steady state temperatures were all at the 95C boost target. The D15 was configured with the included NF-A15 and a NH-A12x25 front fan (for RAM/case clearance) and tested at 50% fan and 100% fan. The H150i was configured as an intake with 3 NH-A12x25 fans and tested at 50% fan, 100% fan, and 100% fan with max pump speed. You can set the curve in your motherboard bios, so long as its pwm (you know this if the connector cable for the fab has 4 connector points.) Otherwise, there could be some 3rd party programs out there that allow you to set your pwm curve on the fly, don't know for sure.
The simple summary is that the D15 is fine for cooling a 7950X. Whereas you need to control the fan through a pwm connector.
Open Hardware Monitor is open-source software that monitors the fan speeds, load. Surprisingly, the D15 performed as well or slightly better than the H150i. Ryzen controller might be giving incompatibility issues with Armoury. I was wondering about air cooling as well, so I ran some tests of a NH-D15 vs a Corsair H150i RGB Pro XT with the CINEBENCH R23 10-minute throttling test.
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