Cooler Master

Cooler Master is a company with a tradition of cooling-related products and thus it is no wonder that they jumped into the AIO liquid coolers wagon almost instantly. They have a healthy selection of products and decided to ship us their two Nepton series coolers, their most popular series at this point in time, along with the Seidon 120V, a very low cost, entry level solution.

Cooler Master Seidon 120V

The Cooler Master Seidon 120V is the smallest, simplest and least expensive AIO cooler of this review. The packaging reflects that, being a relatively simple brown cardboard box, unlike any other in this particular roundup. Looks aside, the packaging is well designed, full of information on the cooler, and the cooler is very well protected inside the cardboard packaging.

Inside the box, the user will find a leaflet with installation instructions, the necessary mounting hardware, and a syringe with thermal compound. Also included is a single 120mm fan with a wide speed range of 600 to 2400 RPM; it is an all-black model with wavy blades.

Both technically and aesthetically, the Cooler Master Seidon 120V is a rather simple design. The 27mm thick, 120mm wide radiator is the smallest and least expensive design available today. Wavy aluminum fins are formed between the liquid pass-through channels, which are not dense but not sparse either. There are imperfections in the fins but these are to be expected with a low-cost radiator.

The square block-pump assembly is entirely made out of plastic, which is not bad in terms of durability but gives a feeling of cheapness. The company logo is etched on the top of the block and a bright blue LED turns on when the pump is powered on. Only the base of the block is made out of copper, which is expected given the price. This copper base has been attached to the rest of the assembly with the aid of ten triangular screws and has a smooth, well-machined surface, although it has not been machined down to a mirror finish. The tubing is corrugated and a little hard to bend but at least the fixing points on the CPU block assembly are rotatable sideways.

Cooler Master Nepton 140XL

Unlike the basic 120V, the Nepton 140XL is a significantly more sophisticated, detailed product. It does however cost twice as much as the 120V. It comes supplied in a carefully designed black-purple cardboard box, well protected inside cardboard packaging.

The bundle is not much different than above, limited to the necessary mounting hardware, a leaflet with installation instructions, and a syringe of thermal compound; a Y-splitter for the attachment of two fans onto one header is also included. Two powerful 140mm fans come with the cooler, with a speed range of 800 to 2000 RPM. These "Jetflo" fans are supposed to have high static pressure and the rubber pads absorb vibrations, reducing noise.

Visually, the Nepton 140XL is not much different from the Seidon 120V. Technically, the two coolers are nothing alike. The 140mm radiator of the Nepton 140XL is not only wider but is also 38mm deep, increasing the effective heat dissipation surface by well over 50%. Size aside, the design of the radiator is similar, with wavy aluminum fins between the heat exchanging channels and with a frame offering the ability to mount either 120mm or 140mm fans on it. However, it would seem that manufacturing imperfections are still present, with several of the fins significantly deformed. It appears as if the radiator was struck with something, deforming half a channel of fins, yet we received the packaging in excellent condition and this side of the radiator was facing inwards, towards the center of the packaging. Quality control issues in Cooler Master's manufacturing paradise are the only reasonable guess we can make -- that or the cooler was previously tested and repackaged for our review, though that seems unlikely.

The square block-pump assembly is once again entirely made out of plastic. Even though it looks much better and of higher quality than that of the 120V, plastic rarely is the way to go when you want a worthwhile aesthetic outcome. The company logo is etched on the top of the block and is surrounded by a frame with a white LED, which turns on when the pump is powered up. A plastic frame is sandwiched between the cap and the base of the assembly, with holes for the mounting of the installation brackets. The copper base of the assembly is smooth but not machined perfectly; although they cannot be felt by touch, the sandpaper grooves are clearly visible with a naked eye.

Cooler Master Nepton 280L

The Nepton 280L is Cooler Master's heavy artillery. We received it supplied inside a well-designed cardboard packaging with a black/purple color theme, visually very similar to that of the 140XL. The main attraction of the kit, the large 280mm radiator, dominates the theme of the box. Inside the box, with the exception of a slightly different installation instructions leaflet, we found the exact same bundle as that of the 140XL, including two of the same 140mm "Jetflo" fans.

The Cooler Master Nepton 280L might appear like an oversized version of the 140XL but it really is not. They do share many similarities but the main part of the kit, the radiator, is very different. The radiator of the 280L, as the name suggests, is 140mm wide and 280mm long, with room for up to four 140mm fans. The frame also offers support for 120mm fans, if the user would like to use 120mm fans instead for whatever reason. However, the radiator of the 280L is only 30mm thick, which is about 25% less than that of the 140XL. Therefore, although the heat dissipation surface is greater, it is not actually double that of the 140XL. Once again, minor deformations of the aluminum fins can be seen, although not nearly as many or as serious as those we encountered on the 140XL.

The square block-pump assembly is entirely identical to that used by the 140XL as well. It features the exact same size, mounting mechanism, pump, core and everything else. The same white LED lighting frame at the top of the block has also been installed. Unfortunately, the same mediocre copper base is also present, which could use a little bit better polishing for a product of this league and price range.

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View All Comments

  • The PC Apologist - Thursday, February 13, 2014 - link

    Would have been great if you read through the comments section...
    Just saying.
  • Daeros - Thursday, February 13, 2014 - link

    This is really bothering me; this article strongly implies that sound pressure equates linearly to to loudness. The decibel scale is logarithmic, true, but while 3db is roughly a doubling in sound energy, it is the smallest difference reliably discernible as louder by people. It takes roughly a 10db increase in sound pressure to have a doubling in perceived loudness. In the example, the 30db difference would be perceived as (roughly) 8 times louder (3 doublings), not 1000 times louder (even though it may be 1000x as much energy). Reply
  • cactusdog - Friday, February 14, 2014 - link

    I don't understand why cooler reviews are done with different speed fans, it makes no sense for comparison. Reply
  • BlakKW - Friday, February 14, 2014 - link

    Nice round-up E.Fyll...congrats on your new spot. Its a fine line between answering questions in the Comments section, and getting sucked into cautious :) Reply
  • MushroomBomb - Friday, February 14, 2014 - link

    Disappointed not seeing any Thermaltake Water, especially with their 3.0 offering, pretty sure they would be able to compete here. Reply
  • Bap2703 - Tuesday, February 18, 2014 - link

    One should take care that the testing setup is in no way providing a "core" temperature despite being written on every graph :/ Reply
  • aggiechase37 - Friday, February 21, 2014 - link

    I've had the stock Intel fan on a 4770, and was getting temperatures in the 90's while rendering video. Thanks to this article, I've got the Corsair h90 on the way. Thanks guys! Reply
  • Valentini - Saturday, December 20, 2014 - link

    Finally a truly meaningful test (the best test I have ever seen). In particular, indication of the thermal resistance is really great. The whole thing would be a little bit more accurate, if the indication of differences in temperature would be written in Kelvin instead of Celsius. Reply
  • pikunsia - Wednesday, August 5, 2015 - link

    The difference in Kelvin (absolute) and Celsius (relative), as well as in Rankine (absolute) and Fahrenheit (relative) are the same! my friend. Please, let me show you, taking for example Celsius-Kelvin. Let T_C, T_K be temperatures in Celsius and Kelvin respectively. Thus,
    T_K1 = T_C1 + 273.15,
    T_K2 = T_C2 + 273.15.
    DT_K = (T_C2 + 273.15) - (T_C1 + 273.15) = DT_C.
    Now, if you're using thermodynamics Relations, for instance (in differential form),
    Tds = dh - vdP,
    where s, h, v, are the specific entropy, the specific enthalpy and the specific volume resp., the temperature T and the pressure P must be necessarily absolute, according to the Second Law of Thermodynamics.
  • ppsu - Friday, August 28, 2015 - link

    It seems there is a new king in town and one of the only 360mm AIO liquid coolers on the market. Fractal Design's Kelvin S36 is an absolute stomper of a unit.

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