Cooler Master Hyper N620 CPU Cooler Review
By Rafael Coelho on December 3, 2009


Hardware Secrets Golden Award

This time we tested Cooler Master Hyper N620 CPU cooler. This model has a tower design, six heatpipes and it is one of the few coolers on market that comes already with two fans. But does it have a good performance? Let's see.

Hyper N620 box isn't facy, with a sober looks.

Cooler Master Hyper N620
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Figure 1: Box.

Inside the box we found the cooler, user manual, installation hardware and a small tube of gray thermal compound.

Cooler Master Hyper N620
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Figure 2: Box contents.

In Figure 3 you can take a look at Hyper N620. In the next pages we will see the cooler in detail.

Cooler Master Hyper N620
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Figure 3: Hyper N620.

Cooler Master Hyper N620

Hyper N620 would be a conventional tower cooler, if it wasn't for some details. The first one is the fact that it comes with two fans installed. In Figure 4 we have a front view of N620 and where you can see the first fan, which pushes air into the heatsink.

Cooler Master Hyper N620
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Figure 4: Front view.

In Figure 5 we see the second fan, which helps to remove hot air from the heatsink. If you pay close attention you will see that the fan connector has four pins and thus the cooler features automatic speed control (PWM).

Cooler Master Hyper N620
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Figure 5: Rear view.

In Figure 6 we have a side view of the cooler. It is not too deep since with two fans it would take a lot of room on the motherboard. Fan attachment is made using screws on the top and with rubber holders on the bottom.

Cooler Master Hyper N620
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Figure 6: Side view.

Cooler Master Hyper N620 (Cont’d)

In Figure 7 we can see N620 from above, where you can better understand the positioning of the fans. Note how they are not exactly in front of each other, so this cooler is wider than other tower coolers with 120 mm fans.

Cooler Master Hyper N620
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Figure 7: Top view.
In Figure 8 we can see the base of the cooler, with a near-mirrored finishing. We also can see the small thermal compound syringe that comes with the cooler.

Cooler Master Hyper N620
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Figure 8: Cooler base.
In Figure 9 we see the cooler heatpipes. Four of them are "U" shaped, with both sides connected to the heatsink. Two heatpipes (located on the extremities of the base), however, have only one of their sides connected to the heatsink.

Cooler Master Hyper N620
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Figure 9: Heatpipes.


In Figure 10 we can see the installation hardware for AMD socket AM3, AM2+, AM2, 939 and 754 CPUs. The rectangular plate goes on the solder side of the motherboard, while the frame is attached to the base of the cooler.

Cooler Master Hyper N620
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Figure 10: Installation hardware for AMD CPUs.

In Figure 11 we can see the clip for use with socket LGA1366. In the sample we received there was no support for socket LGA1156, but probably this clip will be included in the next revision from this cooler, since socket LGA1156 seems to be here to stay.

Cooler Master Hyper N620
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Figure 11: Socket LGA1366 clip.

In Figure 12, you can see the socket LGA775 clip. You can install Hyper N620 on this socket with or without the backplate, but it is recommended to install it, since it prevents the motherboard from bending.

Cooler Master Hyper N620
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Figure 12: Clips for socket LGA775.

In Figure 13 we can see the socket LGA775 clips installed on the base of the cooler.

Cooler Master Hyper N620
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Figure 13: Socket LGA775 clips installed.

Installation (Cont'd)

In Figure 14 we see Cooler Master Hyper N620 installed on our motherboard.

Cooler Master Hyper N620
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Figure 14: Installed on the motherboard.

Inside our case it fit tightly. Its wide heatsink did not interfered with any motherboard component and although it was very close to the power supply it didn't touch it.

Cooler Master Hyper N620
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Figure 15: Installed in the case.

In Figure 16 we can see the fans glowing, both of them with blue LEDs.

Cooler Master Hyper N620
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Figure 16: Fans glowing.

How We Tested

We are adopting the following methodology for our CPU cooler reviews.

First, we chose the CPU with the highest TDP (Thermal Design Power) we had available, a Core 2 Extreme QX6850, which has a 130 W TDP. The choice for a CPU with a high TDP is obvious. To measure the efficiency of the tested cooler, we need a processor that gets very hot. This CPU works by default at 3.0 GHz, but we overclocked it to 3.33 GHz, in order to heat it as much as possible.

We took noise and temperature measurements with the CPU idle and under full load. In order to achieve 100% CPU load on the four processing cores we ran Prime95 with the "In-place Large FFTs" option, and three instances of the StressCPU program, all at the same time.

We also compared the reviewed cooler to the Intel stock cooler (with copper base), which comes with the processor we used, and also with some other coolers we have tested using the same methodology.

Temperature measurements were taken with a digital thermometer, with the sensor touching the base of the cooler, and also with the core temperature reading (given by the CPU thermal sensor) from the from the SpeedFan program, using an arithmetic average of the four core temperature readings.

The sound pressure level (SPL) was measured with a digital noise meter, with its sensor placed 4" (10 cm) from the fan. We turned off the video board cooler so it wouldn't interfere with the results, but this measurement is only for comparative purposes, because a precise SPL measurement needs to be made inside an acoustically insulated room with no other noise sources, which is not the case here.

Hardware Configuration

Software Configuration

Software Used

Error Margin

We adopted a 2 °C error margin, i.e., temperature differences below 2 °C are considered irrelevant.

Our Tests

On the tables below you can see our results. We ran the same tests with the coolers shown on below tables. Each test ran with the CPU idle and the with the CPU fully loaded. On BigTyp 14Pro, TMG IA1, NH-U12P and ISGC-300 the tests were done with the fan at full speed and at minimum speed. The other coolers were connected directly to the motherboard and it controls the fan speed based on CPU load level and temperature on PWM models. ISGC-400, iCEAGE Prima Boss and Megahalems Rev. B were tested at minimum speed on idle test and at maximum speed on full load test.

CPU Idle

CoolerRoom Temp.NoiseFan SpeedBase Temp.Core Temp.
Intel stock14 °C44 dBA1000 rpm31 °C42 °C
BigTyp 14Pro (min)17 °C47 dBA880 rpm29 °C36 °C
BigTyp 14Pro (max)17 °C59 dBA1500 rpm26 °C34 °C
Akasa Nero18 °C41 dBA500 rpm26 °C35 °C
Cooler Master V1014 °C44 dBA1200 rpm21 °C26 °C
TMG IA1 (max)16 °C47 dBA1500 rpm22 °C30 °C
TMG IA1 (min)16 °C57 dBA2250 rpm21 °C30 °C
Zalman CNPS10X Extreme16 °C44 dBA1200 rpm21 °C29 °C
Thermaltake ISGC-10018 °C44 dBA1450 rpm35 °C49 °C
Noctua NH-U12P (low)15 °C42 dBA1000 rpm20 °C30 °C
Noctua NH-U12P15 °C46 dBA1400 rpm20 °C28 °C
Noctua NH-C12P17 °C46 dBA1400 rpm23 °C28 °C
Thermaltake ISGC-20021 °C43 dBA1100 rpm31 °C35 °C
Schythe Kabuto22 °C42 dBA800 rpm29 °C34 °C
Arctic Cooling Alpine 11 Pro20 °C43 dBA1500 rpm32 °C39 °C
ISGC-300 (min)18 °C42 dBA800 rpm26 °C30 °C
ISGC-300 (max)18 °C46 dBA1400 rpm24 °C26 °C
SilverStone NT06-E21 °C66 dBA2600 rpm30 °C41 °C
Zalman CNPS9700 NT22 °C48 dBA1700 rpm28 °C35 °C
Scythe Mugen-2 17 °C41 dBA 700 rpm25 °C30 °C
ISGC-400 (min)17 °C44 dBA850 rpm24 °C30 °C
Cooler Master Vortex 75220 °C48 dBA1700 rpm32 °C44 °C
iCEAGE Prima Boss (min)22 °C42 dBA1000 rpm29 °C36 °C
Evercool Buffalo17 °C51 dBA1850 rpm22 °C29 °C
Scythe Big Shuriken20 °C42 dBA900 rpm31 °C39 °C
Cooler Master Hyper TX321 °C44 dBA1700 rpm30 °C39 °C
Titan Skalli20 °C43 dBA1200 rpm27 °C34 °C
Prolimatech Megahalems Rev. B21 °C40 dBA800 rpm28 °C32 °C
Zalman CNPS9900 NT23 °C45 dBA900 rpm30 °C34 °C
Cooler Master Hyper N62021 °C44 dBA1200 rpm28 °C34 °C

CPU Fully Loaded

CoolerRoom Temp.NoiseFan SpeedBase Temp.Core Temp.
Intel stock14 °C48 dBA1740 rpm42 °C100 °C
BigTyp 14Pro (min)17 °C47 dBA880 rpm43 °C77 °C
BigTyp 14Pro (max)17 °C59 dBA1500 rpm35 °C70 °C
Akasa Nero18 °C48 dBA1500 rpm34 °C68 °C
Cooler Master V1014 °C54 dBA1900 rpm24 °C52 °C
TMG IA1 (max)16 °C47 dBA1500 rpm27 °C63 °C
TMG IA1 (min)16 °C57 dBA2250 rpm25 °C60 °C
Zalman CNPS10X Extreme16 °C51 dBA1900 rpm24 °C50 °C
Thermaltake ISG-10018 °C50 dBA1800 rpm58 °C93 °C
Noctua NH-U12P (low)15 °C42 dBA1000 rpm28 °C59 °C
Noctua NH-U12P15 °C46 dBA1400 rpm25 °C54 °C
Noctua NH-C12P17 °C46 dBA1400 rpm37 °C76 °C
Thermaltake ISGC-20021 °C48 dBA1900 rpm42 °C68 °C
Scythe Kabuto22 °C47 dBA1200 rpm38 °C63 °C
Arctic Cooling Alpine 11 Pro20 °C51 dBA2300 rpm49 °C85 °C
ISGC-300 (min)18 °C42 dBA800 rpm36 °C64 °C
ISGC-300 (max)18 °C46 dBA1400 rpm31 °C56 °C
SilverStone NT06-E21 °C66 dBA2600 rpm39 °C96 °C
Zalman CNPS9700 NT22 °C56 dBA2600 rpm34 °C63 °C
Scythe Mugen-2 17 °C46 dBA 1300 rpm 28 °C54 °C
ISGC-400 (max)17 °C47 dBA1400 rpm36 °C69 °C
Cooler Master Vortex 75220 °C55 dBA2300 rpm48 °C92 °C
iCEAGE Prima Boss (max)22 °C53 dBA2000 rpm35 °C59 °C
Evercool Buffalo17 °C51 dBA1850 rpm32 °C67 °C
Scythe Big Shuriken20 °C50 dBA1500 rpm51 °C85 °C
Cooler Master Hyper TX321 °C53 dBA2700 rpm39 °C66 °C
Titan Skalli20 °C47 dBA1550 rpm37 °C69 °C
Prolimatech Megahalems Rev. B21 °C61 dBA2600 rpm30 °C51 °C
Zalman CNPS9900 NT23 °C56 dBA2000 rpm34 °C54 °C
Cooler Master Hyper N62021 °C50 dBA1650 rpm32 °C56 °C

The next graph shows how many degrees Celsius the CPU core was hotter than room temperature during our idle tests.

Cooler Master Hyper N620 

The next graph gives you an idea on how many degrees Celsius the CPU core was hotter than room temperature during our full load tests.

 Cooler Master Hyper N620

Main Specifications

Cooler Master Hyper N620 main features are:

* Researched on on the day this review was published.


Cooler Master Hyper N620 is a unique cooler, mostly by the fact that it comes with two fans already installed. We were afraid it could be very noisy because of this feature, but it showed to be comparable to its competitors in this aspect.

It achieved a performance similar to the best coolers we've already tested, performing better than some really good coolers. Probably this is due to its design, with two unaligned fans, which helps to achieve a good airflow.

Regarding its looks, Cooler Master did also a good job, with both the fans glowing in blue. You can say it is a good performance cooler by just looking at it.

It is a beautiful high-performance cooler reasonably priced, so it deserves the Hardware Secrets Golden Award seal.

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