So I just crammed an Arctic 420 Aio into my Fractal S2 / R6 case after some top radiator mount Dremel modifications to help clear the RAM! Love it so far! Much quieter (as in silent) and a bit cooler than the NH-u14s that I had on the current and lowly 1700x.
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I also have a NH-u14s tr4 or whatever on the 1950x next to it and I hear that cpu fan all the time.
On EPYC 7452, even when configured to its high-cTDP of 180 W, NH-U14S TR4-SP3 works very very quietly. The fan speed here is most certainly lower than 800 RPM. (Due to a quirk of Supermicro's BIOS, I have disconnected the RPM monitoring pin of the CPU coolers' fans.) The current all-core workload which I have on these CPUs drives them at their 180 W socket power limit with a median core clock of 2.6 GHz.
The NH-U14S keeps them at a median CCD temperature of 48 °C, with an intake air temperature of 26 °C.
That is, NH-U14S can cool 180 W away quietly — very quietly. But it cannot keep core temperatures down if too much voltage is pumped into the cores, or if the cores are configured to run at uselessly high clock speed.
Have a look into the BIOS or into Ryzen Master for an ECO mode option or for a PPT limit option. Using ECO mode, you get
- a marginal decrease in throughput of all-core workloads,
- no decrease in few-cores workloads,
- core clocks which cannot be used to brag about,
- core temperatures which can be used to brag about,
- a reduction of power usage in all-core workloads which is strikingly disproportionate to the reduction of throughput.