Home / Component / Cooling / Cooler Master Seidon 120M Liquid Cooler (inc. Dual Fan Performance 2x Noctua NF-F12)

Cooler Master Seidon 120M Liquid Cooler (inc. Dual Fan Performance 2x Noctua NF-F12)

The Seidon 120M consists of a 27mm-thick aluminium radiator, pump unit with integrated blue LED, a copper waterblock which is machined from a single piece of the metal, and plastic tubing hoses.

Cooler Master uses plastic tubing, rather than the cheaper rubber alternative, as it sacrifices flexibility in favour of lower coolant evaporation rates, in certain scenarios.

Slightly larger than a 120mm fan, the Seidon 120M’s aluminium fin array is manufactured to offer maximum surface area from its pre-defined form factor. This is achieved by aligning the aluminium heat-dissipation strips in a ‘rippled’ fashion.

According to Cooler Master, airflow restrictions inside the fin array have been minimised to reduce fan speed and noise. Nevertheless, the array’s high density will require the use of fans with a high static pressure which are able to force air through the structure.

Inadvertent leakages should be avoided by the tubes’ extremely tight connections to the Seidon 120M’s reservoir area. A filling point is located adjacent to the tubes, but removing this will void warranty; it’s for use by Cooler Master’s engineers only.

Cooler Master gives the pump’s upper surface an eye-catching ‘industrial’ style. A blue LED is located in the unit to confirm the pump’s operation. A 3-pin fan connector provides the 1.8W of power that the Seidon 120M’s pump will consume.

Machined from a single piece of copper, the Seidon 120M’s waterblock should efficiently and effectively transfer heat to the coolant. The copper block uses micro channels to increase its surface area, hence increasing the contact area between the coolant and conducting material. This should increase the rate at which heat is transferred away from the CPU.

Supposedly less flexible than its rubber counterpart, the Seidon 120M’s plastic tubing still offers a good degree of suppleness. Attaching the pump and waterblock unit, when the cooler is installed in a confined space, shouldn’t be an issue.

If the tubing reaches its limit of flexibility, additional freedom of movement can be obtained by rotating the pump unit’s entry connectors. Each connector can be rotated to place the tubes in orientations which are up to 180 degrees apart.

Powered by a 4-pin PWM connector, Cooler Master’s 120mm Blade Master fan provides the Seidon 120M’s airflow. It operates at frequencies of 600-2,400 RPM with a maximum rated noise output of 40dbA. A very high maximum airflow pressure of 4.16mm H2O should be perfectly adequate to pierce the radiator’s dense fin array.

Despite continuous criticism, Cooler Master still insists upon attaching annoying stickers to its fan cables. The hideous, bright yellow ‘do not bin’ sticker can be easily separated, but the pump cable’s white ‘warranty void if removed’ sticker is, due to its message, a permanent eyesore.

Unless Cooler Master is conforming to some type of law, why go to the extra effort of braiding the fan cable if the attractiveness is going to be ruined by needless stickers? We hope Cooler Master will take our advice and eradicate these stickers from future products.

As with many AIO liquid CPU coolers, the user-friendly design allows fans to be installed in a variety of configurations. Exhaust and intake both behind and in front of the radiator are all possible options.

With a fan attached, the Seidon 120M’s thickness increases to around 52mm in the radiator area. This could cause problems for X79 users with tall memory modules installed in the DIMM slots nearest to the IO panel.

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  • Tttt

    Super review Luke. I have to order one of these, what a great deal IMO

  • Eran

    This is an excellent cooler, the all in ones are hard to beat now. I had a D14 for a while and loved it, but it was so hard to get at anything inside the case it blocked half the motherboard !

  • Charles Etheridge

    I recentl got a Seidon 120M and it seems to work very nicely. I did add a C/M Turbo Master Mach 1.8 fan on the case side, which didn’t seem to add any perceptible noise. The one change that I would really like would be the ability to raise the water pump speed. With the two fans it seems that increasing the WP volume would be an excellent option. I’ve got a mildly overclocked i7 – 930 and when running a WSE scan, for instance, hte core temp can still rise to as high as 175 F, so a bit more water flow would be nice. I ahve it in a HAF 922 case and there is plenty of room. I’m about to add a 200mm side fan as well as the original rear case fan at the bottom of the case, and things still won’t be crowded

  • Don

    Did you happen to try installing the fan with an exhaust setup? How much difference would you think the performance/results change?

  • hooner

    I am thinking of buying a Seidon 240, which you can front mount in a N200 case (both products by Cooler Master). If I do front mount is the air being drawn into the case to cool radiator or am I venting air outwards through the front?

    It seems to me air in through the front would mean the heat from the radiator being directed into the case. But i have never thought of front fans becoming exhausts, so perhaps this is correct.

  • Peter

    Hi, I have got this cooling system, but it is incomplete. I would like to but an AMD socket. Has anyone got to sell?