Unboxing And Review Of Noctua NH-P1 Passive CPU Cooler

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  • Review
  • Cooling
  • Unboxing

Noctua NH-P1 Passive CPU Cooler

First teased in Computex 2019 as an early prototype, Noctua finally began shipping of their much anticipated NH-P1 fully-passive, fanless CPU cooler after almost 2 years. We are excited to test the cooler to see if it matches Noctua’s track record of excellent cooling performance.

Unboxing

Noctua NH-P1 Passive CPU Cooler

The NH-P1 is shipped in a familiar white and brown cardboard box. A series of features are highlighted on the back, like 100% RAM clearance and PCIe slot compatibility.

Noctua NH-P1 Passive CPU Cooler

Apart from the short descriptions translated into 9 languages, there are a few lists on the side of the box about the specifications and package content.

Noctua NH-P1 Passive CPU Cooler

The CPU cooler and accessories are packaged in separate cardboard boxes.

Noctua NH-P1 Passive CPU Cooler

Different from most Noctua coolers, the NH-P1 includes a pack of NA-CW1 cleaning wipe, a tube of NT-H2 thermal compound (instead of NT-H1), an upgraded SecuFirm2+ mounting system and a high-quality long Torx screwdriver (NM-SD1). You will also get the usual installation manuals, a set of fan clips and a metal case badge.

The new SecuFirm2+ system supports modern CPU sockets, such as Intel LGA1200, LGA115x, LGA20xx and AMD AM4. We have no idea about why Noctua decided to slightly modified the design of the mounting hardware and switch from standard Phillips screw head to Torx. It may be related to the additional weight from the NH-P1’s larger heatsink. The model names and revision numbers of the baseplate (NM-IBP2 Rev. 2) and brackets (NM-IMB2) are identical to those found on the NH-D15.

Noctua NH-P1 Passive CPU Cooler

Noctua NH-P1 Passive CPU Cooler

Being a completely-fanless cooler, the NH-P1’s heatsink serves as the only component to dissipate the heat from the processor through the convection of air around it (hot air rises). This also means the design of the heatsink is drastically different and has to be purposely-built.

The heatsink on the NH-P1 has about 74% less number of fins (13 vs 50) than a normal single-tower Noctua NH-U12A or NH-U12S. The aluminium fins are also bigger and thicker at around 1.5 mm to compensate the loss of heat capacity from the lower fin count. They are rotated 90 degrees and aligned to be paralleled with the natural convention airflow. The fins are spaced out much wider to let the hot air to travel through the fin stack with less resistance, while there are holes on the fins to allow trapped air to escape.

The whole cooler weighs in at about 1.18 kg. It has a height of 158 mm, a width of 154 mm and a depth of 152 mm. Compatibility with RAM and PCIe slots should still be good, because of the asymmetric heatsink design.

Noctua NH-P1 Passive CPU Cooler

Some of the heatsink fins extend further towards the CPU contact base for additional surface area. The six 6 mm nickel-plated copper heatpipes are connected to the base (38 mm x 40 mm), which are responsible for carrying the heat away from the processor.

Noctua NF-A12x25 LS-PWM Fan

Noctua NH-P1 Passive CPU Cooler

Although the NH-P1 is a 100% passive CPU cooler, you have the option to install a 120 mm fan on the top of the heatsink, if you need some extra cooling performance. Noctua suggests to have the special low-speed version of the NF-A12x25 fan to keep the noise in an acceptable level.

The NF-A12x25 LS-PWM spins from 450 RPM to 1200 RPM, controlled via the 4-pin PWM connector. It is capable of generating about 32.78 CFM of airflow. It has a rated MTBF of over 150,000 hours and a 6-year warranty.

Noctua NH-P1 Passive CPU Cooler

The fan can be mounted on the heatsink’s top and sides, depending on the orientations of your motherboard and PC case, using the included fan clips.

Review

Noctua NH-P1 Passive CPU Cooler

We have updated our CPU cooler tests to more reflect real-world cooling performance of coolers.

Testing Methodology

To find out how the cooler performs, a total of three benchmarks are included. AIDA64 is used to run a CPU stress test. CPU, FPU and system cache are all stressed to create as much heat output as possible. Also, Cinebench R15 and Cinebench R20 are used to simulate real-world CPU load (like video-editing or rendering). It will be run continuously for three times. Ambient temperature is around 21°C.

Results will be taken at a 50% and 100% fan speed, controlled via the motherboard CPU PWM header. Stress test will run for at least 15 minutes. Once the CPU has reached the equilibrium temperature, we will record both the average and highest temperatures of the CPU package/hottest core with HWiNFO in the next 5 minutes.

  • CPU: Intel Core i7-9700K @ 4.80 GHz @ 1.30 V (~150W TDP)
  • Motherboard: ASRock Z370 Killer SLI
  • Thermal Compound: Noctua NT-H1
Performance

Noctua NH-P1 Passive CPU Cooler

The NH-P1 was tested with its default no-fan configuration, as well as adding a NF-A12x25 LS-PWM fan. We swapped the included NT-H2 thermal compound with the NT-H1 for benchmark consistency. The CPU idled at around 32°C to 35°C.

In AIDA64, the cooler was not able to handle the excess heat from our overclocked Intel Core i7-9700K processor (~150-watt of TDP). Temperatures of the CPU package and cores reached 99°C and the CPU started thermal throttling, after the stress test was running for about 7 minutes. To clarify, this result is expected, since the NH-P1 is not rated for the continuous load from high-end CPUs, especially overclocked ones. You can check Noctua’s website for CPU compatibility. The NH-P1 would also return to its idle temperature slower than conventional air coolers after load, as there is no fan to quickly cool down the heatsink.

Putting a fan on top to assist the airflow helped keep the temperatures under control, at 96°C, which further dropped to 86°C and 87°C, when the fan was spinning at 100% speed (~1200 RPM).

Noctua NH-P1 Passive CPU Cooler

Being a shorter benchmark, the NH-P1 was able to hold the temperatures at 86°C passively in Cinebench R15. The additional fan reduced the CPU to 81°C and 82°C.

Noctua NH-P1 Passive CPU Cooler

Results in Cinebench R20 were very similar to those in AIDA64, possibly because of the longer run time. Although the CPU temperatures raised to 99°C and 96°C in the fanless configuration, no thermal throttling was recorded in the process. With the cooling fan at half PWM speed (~650 RPM), the temperatures decreased by 8°C and 7°C respectively. Another 7°C and 4°C improvements can be seen by ramping up to fan to the max.

Comparison

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In this chart, we only include the default configuration of all coolers. Due to the fanless design, the NH-P1 has roughly the same cooling performance as a compact/low-profile air coolers, like the NH-L9x65. It is trading higher CPU temperature for completely silent operation.

Conclusion

Unboxing Treatment Recommendation

The Noctua NH-P1 is a capable cooler, designed for those who are willing to sacrifice a bit of CPU performance to remove the loudest component of a computer. According to our benchmark results, it could handle short and bursty loads from the CPU pretty well. However, the CPU had to thermal throttle to keep the temperature down, if the test ran for more than 5 to 10 minutes. The cooling performance of the NH-P1 will greatly depend on your PC case’s ventilation, because the heat is carried away from the heatsink only by the natural convection of air. Users can opt to purchase the NF-A12x25 LS-PWM fan to increase cooling headroom, by setting a PWM fan curve that ramps up the fan, once the CPU reaches a certain temperature threshold.

Without an included cooling fan, the NH-P1 does not have any moving part and will not actively suck air from the outside. This makes it perfectly suitable in dusty environments, such as a workshop, which can reduce the need for regular maintenance.

The NH-P1 is priced at $109.90 USD (MSRP) with a 6-year warranty. This is a undoubtedly an expensive CPU cooler, considering the NH-D15 and NH-U12A are now on sale for approximately the same prices. More niche products with smaller target audience tend to cost more, because of increased manufacturing costs. The NH-P1 is in a unique position in the market, where it is one of the few passive coolers that is possible to use on a relatively demanding CPU. It is easy to install and does not require a specialized PC case, like those offered by Streacom.

You can purchase the cooler from your local/online retailers or the links below from Amazon and Newegg.

  • Amazon US: Noctua NH-P1 CPU Cooler
  • Amazon US: Noctua NF-A12x25 LS-PWM Fan
  • Newegg US: Noctua NH-P1 CPU Cooler
  • Newegg US: Noctua NF-A12x25 LS-PWM Fan

Thanks Noctua for providing the cooler for review. (Review Sample)

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