Take for example the D15. Noctua themselves mount the fan very low and close to the cpu, giving more air directed at the pipes. People who use two fans tend to mount the fans higher to get more RAM clearance and have the fans symmetrical. How much does this affect CPU temps? I would imagine it at least affect the motherboard temperatures.
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How much does fan height placement in a air cooler affect performance?
Znerk
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Take for example the D15. Noctua themselves mount the fan very low and close to the cpu, giving more air directed at the pipes. People who use two fans tend to mount the fans higher to get more RAM clearance and have the fans symmetrical. How much does this affect CPU temps? I would imagine it at least affect the motherboard temperatures.
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Almost zero effect if you already have good airflow from intake fans. If you mount them too low however, and they touch any metal part of the cooler, the vibrations will travel. I've done it myself. I was also under the impression that the lower part of the fan that blows air over VRM's helped cool them down, but to my surprise the temps are exactly the same using an NH-D14 and a be Quiet! Dark Rock Slim. I checked using software and the thermometer gun I used when my NH-D14 was installed. I use a Fractal Define C with 2 140mm NF-A14's PWM.
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According to noctua the difference is only 1-2 degrees between one and two fans.
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Sometimes mounting lower helps mobo component temps, especially if mobo components run hot.
1x in middle vs 2x fans on twin tower is same temp at same fan noise level. 2x fans are about 2db louder than 1 fan. Slow 2x fans down maybe 100rpm to same dB ans single fan and they move same mount of air.
1x in middle vs 2x fans on twin tower is same temp at same fan noise level. 2x fans are about 2db louder than 1 fan. Slow 2x fans down maybe 100rpm to same dB ans single fan and they move same mount of air.
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It was a lot more significant on a 12900K
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Do you mean that you got better results with one fan?It was a lot more significant on a 12900K
In the case of NH-D14 and NH-D15, the middle fan will actually be less noisy if you use both. The middle fan wont have to pull air in through additional fins, as it is provided with ample air via the first (unobstructed) fan. I also removed the first fan as it was touching my ram, but that made all kinds of noise. I just moved the first fan upwards and back to silent cpu cooling
Also you can replace the first 140mm with a 120mm no prob.
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No. I meant that removing one fan was significantly worse than 1-2C with a 12900K
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That's strange. I had the opposite experience. Only around 1-2 degrees difference. I tested on a test bench though, so fresh air was never a problem. Did you test in a case?No. I meant that removing one fan was significantly worse than 1-2C with a 12900K
Intel 4670k, 12 gb of ddr3. 3 ssd 500 mb/s. wx 4100 4gb radeon.
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My two cents: I use custom fans sometimes on cpu coolers. Not all case fans are built the same. Some cool better on the sides then directly through their fan chasis. You can also cool a very large cpu heatsink with a table top fan too.
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It was an open-air test bench with three additional desk fans blowing on the RAM xD
What CPU were you using?
A 12900K can easily saturate a D15 and the temperature delta between fan configs will naturally be higher as the amount of heat that needs to be removed goes up.
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It was actually a 12900k, but it is a terrible CPU to test this scenario with due to all the famous issues in regards to the contact between cooler and cpu, bending etc.
Stock ILM?
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Yes. It was just after launch.
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Sounds like a very unique cooling environment not even remotely like most of us run our systems. With that many desk fans blowing you had a veritable storm over your benchtop. Desk fans' airflow were quite likely disrupting cooler fan airflow.
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Perhaps, but it would make sense if it is. We are talking a lot more coverage of the pipes. Most people with dual setup wants a symmetrical setup and aim for the top rubber part to be level with the top fin. Noctua themselves have it mounted 7 fins down. That is a big difference in terms of coverage.
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