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Comparison Noctua NH-D15S vs Noctua NH-U14S

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Noctua NH-D15S
Noctua NH-U14S
Noctua NH-D15SNoctua NH-U14S
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Main
Quality proven by 400 awards. Quiet even under full load. Ease of installation. 6 heat pipes. Automatic regulation of rotation speed.
Main specs
Featuresfor CPUfor CPU
Product typeair coolerair cooler
Air flow directionsideways (dispersion)sideways (dispersion)
Max. TDP220 W220 W
Fan
Number of fans11
Fan size140 mm140 mm
Bearing
magnetic centring /SSO2/
magnetic centring /SSO2/
Min. RPM300 rpm
Max. RPM1500 rpm
1500 rpm /1200 when using an adapter/
Speed controllerauto (PWM)
auto (PWM) /+ adapter - resistor/
Max. air flow82.5 CFM83 CFM
MTBF150 K hours150 K hours
replaceable
Noise level25 dB25 dB
Power source4-pin4-pin
Radiator
Heat pipes66
Heatpipe contactindirectindirect
Heatsink materialaluminium / copperaluminium / copper
Plate materialnickel-plated coppernickel-plated copper
RAM space65 mm32 mm
Socket
AMD AM2/AM3/FM1/FM2
Intel 1150
Intel 1155/1156
Intel 2011 / 2011 v3
Intel 2066
Intel 1151 / 1151 v2
Intel 1200
AMD AM2/AM3/FM1/FM2
Intel 1150
Intel 1155/1156
Intel 2011 / 2011 v3
Intel 2066
Intel 1151 / 1151 v2
Intel 1200
General
Mount typebilateral (backplate)bilateral (backplate)
Dimensions165х150х135 mm165х150х78 mm
Height165 mm165 mm
Weight1150 g935 g
Added to E-Catalogmay 2015september 2013

Min. RPM

The lowest speed at which the cooling fan is capable of operating. Specified only for models with speed control (see below).

The lower the minimum speed (with the same maximum) — the wider the speed control range and the more you can slow down the fan when high performance is not needed (such a slowdown allows you to reduce energy consumption and noise level). On the other hand, an extensive range affects the cost accordingly.

Max. air flow

The maximum airflow that a cooling fan can create; measured in CFM — cubic feet per minute.

The higher the CFM number, the more efficient the fan. On the other hand, high performance requires either a large diameter (which affects the size and cost) or high speed (which increases the noise and vibration levels). Therefore, when choosing, it makes sense not to chase the maximum air flow, but to use special formulas that allow you to calculate the required number of CFM depending on the type and power of the cooled component and other parameters. Such formulas can be found in special sources. As for specific numbers, in the most modest systems, the performance does not exceed 30 CFM, and in the most powerful systems it can be up to 80 CFM and even more.

It is also worth considering that the actual value of the air flow at the highest speed is usually lower than the claimed maximum; see Static Pressure for details.

RAM space

The height of the space for RAM (random access memory) provided by the design of the cooling system.

Such a space is found predominantly in processor systems (see "Purpose"). Modern CPU coolers can be very large, and when installed, they often cover the RAM slots closest to the processor. This can be avoided by making the design narrow enough — however, this, in turn, negatively affects efficiency. That's why many manufacturers use another option — they don't limit the width of the cooler, but place its components at a high height, allowing you to place RAM bars of a certain height under them. Sometimes a special cutout is even made at the bottom of the radiator, which further increases the available space. And in this paragraph, the maximum height of the bar that can be placed under the cooling system is indicated.

Dimensions

General dimensions of the cooling system. For water systems (see "Type"), this paragraph indicates the size of the external radiator (the dimensions of the water block in such devices are small, and there is no need to specify them in particular).

In general, this is a fairly obvious parameter. We only note that for case fans (see ibid.), the thickness is of particular importance — it directly depends on how much space the device will take up inside the system unit. At the same time, it is customary to refer to fans with a thin case for models in which this size does not exceed 20 mm.
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