Cooler Master Seidon 240M CPU Cooler Review

Author: AkG
Date: February 26, 2013
Product Name: Seidon 240M
Part Number: RL-S24M-24PK-R1
Warranty: 2 Years
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Closer look at the Seidon 240M

Much like any All In Once cooling device meant for the retail channel, the Seidon 240M’s shipping container is eye catching while still being very informative.

The exterior may be large and distinctive, but the internal protection scheme is very similar to that of the competition. A sturdy cardboard tray with foam topper is the de-facto standard for AIO’s and it is not surprising to see Cooler Master opt for this form of internal protection.

Cooler Master has a reputation for complete well thought out, high quality accessories and the Seidon does not disappoint in this area. It includes a well-documented installation pamphlet, a large bag containing mounting equipment for all current Intel and AMD systems, a small tube of TIM and even a rubber vibration dampening sheath to help reduce fan / radiator mount vibrations. The latter is something not usually found in AIO accessory lists but it still quite welcome.

Currently, most All In One water coolers use either CoolIT or Asetek as their OEMs, with very few external details to differentiate them from one another. That hasn’t happened here since Cooler Master decided to take the road less travelled and ended up designing their own custom solution. It is both unique and a departure from most other units we’ve looked at in the past.

Radiator designs have somewhat homogenized over the past few generations of AIO units and while the one on Cooler Master’s Seidon 240M uses a standard dual 120mm layout which is 27mm thick and uses 12 channels, this is where the similarity ends radiator’s ends. Unlike any AIO we have seen in a long time there is the standard inlet and outlet port but there is also a third ‘fill’ port.

The third port of is sealed and has a “warranty void” if broken sticker applied to it, but if in a few years –after the warranty expires – refilling or simply ‘burping’ it will be relatively easy. This certainly does give the Seidon an added level of flexibility, but we are not entirely sure of its merits on a Sealed unit. Future refilling ideas or not, this third empty port is simply going to be another point of failure for most consumers.

The most obvious difference between the Seidon 240M and its immediate competition is the integrated waterblock and pump combination. Cooler Master states this is a completely in-house design. It also borrows heavily from the air cooling marketplace by using a tried and true mounting design with dual arms that mount directly on to the waterblock. This modular approach should make for a simple installation process and one that will be very reassuring to first time AIO users.

The block itself uses a distinct circular design which is extremely compact, possibly leading to some flow restrictions but that shouldn’t be an issue for a number of reasons. Cooler Master states the integrated pump is able to provide excellent flow values but is so quiet that an LED was added to reassure users it is indeed running. In testing the 240M’s pump easily puts CoolIT and Asetek designs to shame in the acoustics department but doesn’t incorporate an built-in fan controller. While fan controllers are still not the de-facto standard on these sealed water coolers, the lack of any hardware or software customization for the fans’ speed is rather unfortunate.

One of the reasons Cooler Master was able to opt for such a low noise pump is because of their proprietary UltraFine Micro-Channel design found inside the waterblock. It allows more copper to come into contact with the water flow and leads to a more efficient transfer of heat to the coolant. Unfortunately, one downside to using such a low noise pump is it can’t sustain sufficient water flow speed through larger diameter openings, hence the strict adherence to 3/8” OD tubing.

Connecting the block to the radiator is a pair of water lines which are attached to 90° connectors and are fabricated using rigid style tubing instead of the newer more malleable rubber compound used on some other units. The 90° connectors do however provide enough swiveling capability so the rigid tubing becomes a non-issue during installation.

The water block’s base finish is easily the best we have encountered to date on a sealed water cooling unit. It is simply in a different league than even Asetek units and this should help boost performance slightly. Interestingly, Cooler Master has not opted for pre-applied thermal compound, opting to include a small tube of TIM instead. While certainly a boon to enthusiasts, this does make the Seidon slightly less user-friendly for novices who may not be comfortable applying their own compound.

The Seidon 240M’s fans are very similar in appearance and design to Cooler Master’s ‘BladeMaster’ line. However, in this case they are rated for 600 – 2400 rpm with a maximum static pressure of a whopping 4.16mm. In other words, these 86.15 CFM fans will use high static pressure to power airflow through the radiator but won’t do so at low volumes. In addition, a Rifle Bearing design puts them at a distinct disadvantage against the Fluid Dynamic bearing fans used in Corsair, NZXT and numerous other competitors’ offerings. We are unsure why Cooler Master spent so much time and effort making the pump so quiet just too have it be easily overwhelmed by rather loud fans.

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