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Cooler Master Nepton 240M Review


Cooler Master Nepton 240M Closer Look:

Looking at the system, we see the typical AIO setup: a water block / pump with power lead, the ribbed tubing, and finally the radiator. The radiator feels solid and i,s of course filled, at the factory. The Neptons are known for the over-sized tubes. Thick, yet very flexible, and long, which should ease up on the usual twisting and pulling that you go through when getting the radiator into position in the case. There is only a single 4-pin power lead coming from the pump, so the fans are not controlled by the pump, which is not necessarily a bad thing. In fact, it helps to keep some of the cable clutter down.










The radiator is 240mm long, 27mm thick, and is constructed from aluminum. The inlet and outlet tubes are a hefty 13.7mm diameter and are firmly secured to the radiator. The larger diameter tubes will allow for a better, less restricted fluid flow rate. There is a sealed fill port off to one side and it is clearly labeled with "Do not tamper with or remove" and "Warranty void if removed."



Here you can get an idea of the tube size. Cooler Master follows through with the large diameter FEP tubes on the Nepton series. On both sides of the radiator frame there are tapped mounting holes for two 120mm cooling fans, so in a push / pull configuration you can add two more fans for a total of four. FEP tubing provides extremely low liquid evaporation rate and prevents structural kinks for higher waterflow when compared to rubber and PVC. Nepton AIO water coolers utilize robust FEP tubing to ensure maximum waterflow by preventing structural kinks that restrict throughput, which often happens with rubber tubing.



The pump cover has a thin hexagonal lens that surrounds the Cooler Master logo. When the pump is powered up, white LEDs make the hex shaped lens and Cooler Master logo glow. In the top picture, I already have the side mounting brackets installed. The 240M uses a different version of the mounting brackets than what is used on the Nepton 280L. The screws are retained to the brackets, which makes the installation a little more friendly. I always end up chasing at least one of the screws around when they are loose. The retained screws can slide in the bracket slots to adjust for different sockets. I have to wonder if they will eventually be carried over to the 280L? The pump also boasts a 14dBA noise output, a lower vibration rate of 10 mg rms and a 70,000 hour lifespan. That many hours equals 2,916 days or 8 years of non-stop running.



Underneath, you can see the four mounting holes along the sides of the grey colored flange for the two brackets that attach the water block / pump to the base. There are dedicated brackets for both AMD and Intel motherboards. Don't forget to remove the protective plastic cover that is stuck over the cold plate. The cold plate surface appears to have been ground rather than polished to a mirror finish. Here on the right I am of course using the Intel brackets for my Intel board and you can see the retained screws at the four corners.



The inlet and outlets can be rotated slightly to allow for the tubing to conform to the way you mount the radiator. On the right, you can see Cooler Master's new Skived Fin Microchannels, which per Cooler Master is "designed for the best water flow and draws the maximum amount of heat away from the cold plate and transfers it to the coolant". The skived fin surface area is a massive 31,808mm2 and for comparison the surface area of the copper base on the Corsair H80i / H100i is 6,869mm2. The larger surface area allows for improved heat transfer. Water flows into the main channel then laterally through skived fin microchannels. Cooler Master claims that the principles of jet impingement heat transfer enable effective cooling and reduction of hotspots. It worked well on the Nepton 280L, so I am sure we will see similar performance with the 240M.



And here we have one of the two included Silencio FP 120mm fans. This is a new fan series from Cooler Master that is currently exclusive to the Nepton 120XL and 240M coolers. These are 4-pin PWM fans that use a Loop Dynamic Bearing (LDB) and are rated at 16.5-76 CFM +/- 10%. The speed is variable from 800-2400 RPM (PWM) +/- 10%.  Other features include: High Air Pressure - 4.8 mm H2O, Low Noise Output - 27 dBA (max), and Low Power Consumption - 4.8 W (12 V, 0.4 A). Also included with the 240M is a rectangular rubber vibration isolation gasket that goes between the fans and the radiator to further dampen any vibrations.



The rubber gasket is very flexible and a little tricky to install. The best way I found is to lay the radiator flat, carefully place the gasket on the radiator face and then put the fans on top of the gasket and start the thumb screws on opposite corners of the fans. The tricky part, is getting all the holes in the gasket to line up with the holes in the radiator.



The base mounting bracket has a green insulating layer and short studs with adjustable plastic clips. You insert the studs through the appropriate holes in the base and then pop the clips on and slide them to lock the studs to the proper location depending on your socket type. The clips do a good job of holding the studs in place as you install the bracket to the rear of the motherboard. Flip the bracket over and you are ready for an AMD motherboard.



So now we go to the installation. It is an understatement to say that there is plenty of room in the Phanteks Enthoo Primo case. The long tubes give you some welcome flexibility when installing the radiator. Here is where the thumbscrews really shine and reveal the beauty and utility of Cooler Master's tool-free AIO watercooler. It can be a little bit of a challenge when trying to hold the radiator in position and get a fan in there, and then get a screw started. How many times do you drop a screw, then everything shifts out of place? Not with the thumbscrews. This is a really great idea. Need to clean the fan or radiator? No problem - in a few seconds you remove them without any tools, and have them back in action in a snap.

The 240M uses a little different approach to the final cooler mounting than the 280L. The Nepton 280L used longer studs and hollow plastic spacers and four thumbscrews that secured each of the four corners of the pump base mounting brackets to the studs, but the 240M uses short studs and the spacers are now threaded metal hex standoffs. These hex standoffs screw down over the studs and lock the base plate to the motherboard. The thumbscrews are replaced by retained screws that now secure the pump directly to the four hex standoffs. I don't know why Cooler Master changed the installation hardware for the 240M, particularly since the pumps and base plates appear to be identical. Regardless, both methods work well and I have no complaints.




The pump can move 120 liters per hour and is powered by the CPU fan header on your motherboard. 120 liters per hour is roughly 32 gallons per hour or just over 1/2 a gallon per minute (GPM). There are no fan controls (power leads) on the water block / pump. The power cable for the fans is actually a separate 4-pin splitter that plugs into the CPU optional fan header on your motherboard and allows you to power both of the 120mm fans. 

  1. Cooler Master Nepton 240M: Introduction & Closer Look
  2. Cooler Master Nepton 240M Closer Look: Continued
  3. Cooler Master Nepton 240M: Specifications & Features
  4. Cooler Master Nepton 240M Testing: Setup & Results
  5. Cooler Master Nepton 240M: Conclusion
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