[nextpage title=”Introduction”]

The Cooler Master Nepton 140XL is a high-end liquid cooling system for processors. It has a big 140 mm radiator with two 140 mm fans in push-pull configuration.

As with any sealed liquid cooling system, the Nepton 140XL comes with the coolant liquid pre-filled inside the loop (block, radiator, pump, and hoses).

Figure 1 shows the box of the Cooler Master Nepton 140XL.

Cooler Master Nepton 140XLFigure 1: Package

Figure 2 shows the contents of the box: the radiator-block set, two fans, a Y-harness, a small syringe of thermal compound, a manual, and the installation hardware.

Cooler Master Nepton 140XLFigure 2: Accessories

This water cooler is discussed in detail in the following pages.

[nextpage title=”The Nepton 140XL”]

The sealed radiator-block system is shown in Figure 3. At the left is the radiator that transfers the heat from the circulating liquid to the air and at the right is the block that transfers the heat from the CPU to the coolant liquid. The hoses are 13.4” (340 mm) long and, according to the manufacturer, are 66% thicker than usual hoses.

Cooler Master Nepton 140XLFigure 3: Sealed system

Figures 4 and 5 reveal the radiator of the Cooler Master Nepton 140XL. It supports one 140 mm fan at each side and it is 1.5” (38 mm) thick. Even though it is a 140 mm radiator, both sides also have threaded holes for installing 120 mm fans, which makes it compatible with most computer cases.

Cooler Master Nepton 140XLFigure 4: Radiator

Cooler Master Nepton 140XLFigure 5: Radiator

[nextpage title=”The Nepton 140XL (Cont’d)”]

Figure 6 shows the top of the block, where the pump that makes the liquid flow is integrated. The cable has a three-pin connector, which draws power for the integrated pump. The clear area around the manufacturer logo glows in white when the product is working.

Cooler Master Nepton 140XLFigure 6: Block

The base of the block, which is made of copper, is revealed in Figure 7.

Cooler Master Nepton 140XLFigure 7: Base

Figure 8 illustrates the 140 mm PWM fans that come with the Cooler Master Nepton 140XL (model DF1402512RFUN-1, 140 mm, 2,000 rpm, 3.6 W, 122.5 cfm, 39 dBA).

Cooler Master Nepton 140XLFigure 8: Fans

[nextpage title=”Installation”]

In Figure 9, you can see the backplate for installing the Nepton 140XL on Intel LGA775, LGA1150, LGA1155, LGA1156, and LGA1366 sockets, and all AMD systems. Socket LGA2011 CPUs use the stock backplate.

Cooler Master Nepton 140XLFigure 9: Backplate

You also have to attach the two clips to the block. Figure 10 shows the Intel clips installed; there is also a pair of clips for use with AMD processors.

Cooler Master Nepton 140XLFigure 10: Clips installed

Place the backplate on the solder side of the motherboard and place the four spacers shown in Figure 11 on the component side.

Cooler Master Nepton 140XLFigure 11: Spacers

The last step is to install the system inside the computer, attaching the block on the CPU using four nuts and the radiator on the top panel. We installed both the fans outside blowing outwards.

One interesting thing is that the screws that hold the fans (and also hold the radiator at the case) are all thumbscrews, which we never saw before.

Cooler Master Nepton 140XLFigure 12: Installation finished

[nextpage title=”How We Tested”]

We tested the cooler with a Core i5-2500K CPU (quad-core, 3.3 GHz), which is a socket LGA1155 processor with a 95 W TDP (Thermal Design Power). In order to get higher thermal dissipation, we overclocked it to 4.0 GHz (100 MHz base clock and x40 multiplier), with 1.3 V core voltage (Vcore). This CPU was able to reach 4.8 GHz with its default core voltage, but at this setting, the processor enters thermal throttling when using mainstream coolers, reducing the clock and thus the thermal dissipation. This could interfere with the temperature readings, so we chose to maintain a moderate overclocking.

We measured noise and temperature with the CPU under full load. In order to get 100% CPU usage in all cores, we ran Prime 95 25.11 with the “In-place Large FFTs” option. (In this version, the software uses all available threads.)

We compared the tested cooler to other coolers we already tested, and to the stock cooler that comes with the Core i5-2500K CPU. Every cooler was tested with the thermal compound that comes with it.

Room temperature measurements were taken with a digital thermometer. The core temperature was read with the SpeedFan program (available from the CPU thermal sensors), using an arithmetic average of the core temperature readings.

During the tests, the panels of the computer case were closed. The front and rear case fans were spinning at minimum speed in order to simulate the “normal” cooler use on a well-ventilated case. We assume that is the common setup used by a cooling enthusiast or overclocker.

The sound pressure level (SPL) was measured with a digital noise meter, with its sensor placed near the top opening of the case. This measurement is only for comparison 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

Operating System Configuration

  • Windows 7 Home Premium 64 bit SP1

Software Used

Error Margin

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

[nextpage title=”Our Tests”]

The table below presents the results of our measurements. We repeated the same test on all coolers listed below. Each measurement was taken with the CPU at full load. In the models with a fan supporting PWM, the motherboard controlled the fan speed according to core load and temperature. On coolers with an integrated fan controller, the fan was set at the full speed.

Cooler Room Temp. Noise Speed Core Temp. Temp. Diff.
Intel stock cooler 18 °C 41 dBA 2000 rpm 97 °C 79 °C
Cooler Master Hyper TX3 18 °C 50 dBA 2850 rpm 69 ºC 51 °C
Corsair A70 23 °C 51 dBA 2000 rpm 66 ºC 43 °C
Corsair H100 26 °C 62 dBA 2000 rpm 64 ºC 38 °C
EVGA Superclock 26 °C 57 dBA 2550 rpm 67 ºC 41 °C
NZXT HAVIK 140 20 °C 46 dBA 1250 rpm 65 ºC 45 °C
Thermalright True Spirit 120 26 °C 42 dBA 1500 rpm 82 °C 56 °C
Zalman CNPS12X 26 °C 43 dBA 1200 rpm 71 °C 45 °C
Zalman CNPS9900 Max 20 °C 51 dBA 1700 rpm 62 °C 42 °C
Titan Fenrir Siberia Edition 22 °C 50 dBA 2400 rpm 65 °C 43 °C
SilenX EFZ-120HA5 18 °C 44 dBA 1500 rpm 70 °C 52 °C
Noctua NH-L12 20 °C 44 dBA 1450 rpm 70 °C 50 °C
Zalman CNPS8900 Extreme 21 °C 53 dBA 2550 rpm 71 °C 50 °C
Gamer Storm Assassin 15 °C 48 dBA 1450 rpm 58 °C 43 °C
Deepcool Gammaxx 400 15 °C 44 dBA 1500 rpm 60 °C 45 °C
Cooler Master TPC 812 23 °C 51 dBA 2350 rpm 66 °C 43 °C
Deepcool Gammaxx 300 18 °C 43 dBA 1650 rpm 74 °C 56 °C
Intel stock cooler 18 °C 41 dBA 2000 rpm 97 °C 79 °C
Xigmatek Praeton 19 °C 52 dBA 2900 rpm 83 °C 64 °C
Noctua NH-U12P SE2 18 °C 42 dBA 1300 rpm 69 °C 51 °C
Deepcool Frostwin 24 °C 46 dBA 1650 rpm 78 °C 54 °C
Thermaltake Frio Advanced 13 °C 56 dBA 2000 rpm 62 °C 49 °C
Xigmatek Dark Knight Night Hawk Edition 9 °C 48 dBA 2100 rpm 53 °C 44 °C
Thermaltake Frio Extreme 21 °C 53 dBA 1750 rpm 59 °C 38 °C
Noctua NH-U9B SE2 12 °C 44 dBA 1700 rpm 64 °C 52 °C
Thermaltake WATER2.0 Pro 15 °C 54 dBA 2000 rpm 52 °C 37 °C
Deepcool Fiend Shark 18 °C 45 dBA 1500 rpm 74 °C 56 °C
Arctic Freezer i30 13 °C 42 dBA 1350 rpm 63 °C 50 °C
Spire TME III 8 °C 46 dBA 1700 rpm 70 °C 62 °C
Thermaltake WATER2.0 Performer 11 °C 54 dBA 2000 rpm 49 °C 38 °C
Arctic Alpine 11 PLUS 11 °C 45 dBA 2000 rpm 82 °C 71 °C
be quiet! Dark Rock 2 10 °C 41 dBA 1300 rpm 58 °C 48 °C
Phanteks PH-TC14CS 16 °C 47 dBA 1300 rpm 58 °C 42 °C
Phanteks PH-TC14PE 16 °C 48 dBA 1300 rpm 57 °C 41 °C
SilverStone HE01 (Q) 19 °C 44 dBA 1150 rpm 63 °C 44 °C
SilverStone HE01 (P) 20 °C 57 dBA 2050 rpm 62 °C 42 °C
Thermaltake WATER2.0 Extreme (S) 17 °C 44 dBA 1250 rpm 52 °C 35 °C
Thermaltake WATER2.0 Extreme (E) 17 °C 53 dBA 1900 rpm 50 °C 33 °C
Deepcool Neptwin 11 °C 46 dBA 1500 rpm 56 °C 45 °C
SilverStone HE02 19 °C 49 dBA 2000 rpm 64 °C 45 °C
Zalman CNPS9900DF 23 °C 45 dBA 1400 rpm 68 °C 45 °C
Deepcool ICE BLADE PRO V2.0 22 °C 43 dBA 1500 rpm 67 °C 45 °C
Phanteks PH-TC90LS 24 °C 47 dBA 2600 rpm 95 °C 71 °C
Rosewill AIOLOS 20 °C 40 dBA 1600 rpm 94 °C 74 °C
Corsair H60 20 °C 49 dBA 2000 rpm 64 °C 44 °C
Zalman LQ310 27 °C 51 dBA 2050 rpm 65 °C 38 °C
Noctua NH-L9i 24 °C 44 dBA 2500 rpm 95 °C 71 °C
NZXT Respire T40 20 °C 45 dBA 1850 rpm 76 °C 56 °C
NZXT Respire T20 21 °C 45 dBA 1900 rpm 77 °C 56 °C
Zalman LQ315 20 °C 52 dBA 1950 rpm 57 °C 37 °C
Corsair H80i (Quiet) 19 °C 44 dBA 1100 rpm 61 °C 42 °C
Corsair H80i (Maximum) 19 °C 57 dBA 2500 rpm 55 °C 36 °C
NZXT Kraken X40 (Silent) 25 °C 44 dBA 1050 rpm 66 °C 41 °C
NZXT Kraken X40 (Extreme) 25 °C 53 dBA 1650 rpm 62 °C 37 °C
Zalman LQ320 20 °C 52 dBA 2100 rpm 57 °C 37 °C
Corsair H100i (Quiet) 22 °C 45 dBA 1150 rpm 58 °C 36 °C
Corsair H100i (Maximum) 22 °C 61 dBA 2500 rpm 54 °C 32 °C
NZXT Kraken X60 (Silent) 26 °C 46 dBA 1000 rpm 62 °C 36 °C
NZXT Kraken X60 (Extreme) 26 °C 60 dBA 1650 rpm 60 °C 34 °C
Prolimatech Genesis Black Series 25 °C 46 dBA 1150 rpm 69 °C 44 °C
Phanteks PH-TC12DX 25 °C 51 dBA 1850 rpm 74 °C 49 °C
Corsair H90 23 °C 51 dBA 1550 rpm 61 °C 38 °C
Corsair H110 27 °C 58 dBA 1500 rpm 60 °C 33 °C
Evercool Venti 23 °C 49 dBA 2250 rpm 72 °C 49 °C
Thermalright Archon SB-E X2 22 °C 45 dBA 1400 rpm 68 °C 46 °C
Scythe Kabuto II 20 °C 41 dBA 1450 rpm 67 °C 47 °C
Prolimatech Megahalems Red Series 20 °C 51 dBA 1500 rpm 63 °C 43 °C
Zalman FX100 (fanless) 18 °C NA NA 98 °C 80 °C
Zalman FX100 (92 mm fan) 18 °C 50 dBA 2850 rpm 69 °C 51 °C
Gelid The Black Edition 21 °C 45 dBA 1650 rpm 66 °C 45 °C
Thermalright AXP-100 22 °C 42 dBA 2400 rpm 76 °C 54 °C
SilverStone NT06-PRO 19 °C 50 dBA 2400 rpm 72 °C 53 °C
SilverStone AR01 11 °C 46 dBA 2150 rpm 53 °C 42 °C
Cooler Master Seidon 120M 16 °C 52 dBA 2300 rpm 58 °C 42 °C
Enermax ETS-T40-White Cluster 16 °C 50 dBA 2200 rpm 63 °C 47 °C
Cooler Master Seidon 120XL 17 °C 54 dBA 2250 rpm 55 °C 38 °C
Cooler Master Seidon 240M 13 °C 59 dBA 2200 rpm 49 °C 36 °C
SilverStone AR02 9 °C 46 dBA 2800 rpm 60 °C 51 °C
Cooler Master V8 GTS 10 °C 51 dBA 1650 rpm 54 °C 44 °C
SilverStone TD03 16 °C 57 dBA 2350 rpm 54 °C 38 °C
SilverStone TD02 17 °C 57 dBA 2350 rpm 50 °C 33 °C
Corsair H75 29 °C 51 dBA 2000 rpm 71 °C 42 °C
Cooler Master Nepton 140XL 25 °C 60 dBA 2150 rpm 58 °C 32 °C

In the graph below, you can see how many degrees Celsius hotter the CPU core is than the air outside the case. The lower this difference, the better is the performance of the cooler.

 Cooler Master Nepton 140XL

In the graph below, you can see how many decibels of noise each cooler makes.

Cooler Master Nepton 140XL

[nextpage title=”Main Specifications”]

The main specifications for the Cooler Master Nepton 140XL CPU cooler include:

  • Application: Sockets AM2(+), AM3(+), FM1, FM2, LGA775, LGA 1150, LGA1155, LGA1156, LGA1366, and LGA2011
  • Radiator dimensions: 5.5 x 6.7 x 1.5 inches (139 x 171 x 38 mm) (W x L x H)
  • Block height: 1.8 inches (45 mm)
  • Fins: Aluminum
  • Base: Copper
  • Heat-pipes: None
  • Fans: Two, 140 mm
  • Nominal fan speed: 2,000 rpm
  • Fan air flow: 122.5 cfm
  • Power consumption: 2 x 3.6 W
  • Nominal noise level: 39 dBA
  • More information: https://www.coolermaster.com
  • Average price in the U.S.*: USD 100.00

* Researched at Newegg.com on the day we published this review.

[nextpage title=”Conclusions”]

The Cooler Master Nepton 140XL is a real high-end liquid cooling system, beating systems with 240 mm radiators. It is also very easy to install and very flexible, thanks to the holes that allow to install it with 120 mm fans. It means you can install it in a case with no support for 140 mm fans.

The only drawback is the high noise level when the fans are at full speed.

The Cooler Master Nepton 140XL is a great choice if you are looking for a compact, high-performance liquid cooling system.