We were quite surprised and pleased when we opened up the packaging and realised that the Seidon 240M isn’t just another rebranded version of the same Asetek cooler. It seems that Cooler Master have designed it from the ground up, although it does appear to share some components with the 120M.
As its name suggests, the Seidon 240M features a 240 mm radiator which is 25 mm thick. This is the same thickness as the other 240 mm all-in-one liquid coolers on the market. Rather than using the rubber tubing that most manufacturers are opting for these days, Cooler Master has chosen to use FEP style tubing. This isn’t ideal as it is fairly rigid and less easy to bend during installation than the rubber tubing. Some claim the life span of this material is better however.
There are plenty of cases out there these days that support a 240 mm radiator in the roof. Compatibility of 240 mm radiators is much better than the more recent 280 mm radiators such as the Corsair H110.
When looking at the CPU block, there does appear to be similarities to the Asetek based coolers, however there are a few notable differences, especially in the mounting system The contact plate is made from brushed copper and is surrounded by triangular security screws and the top cover of the cooler has a rather unusual design.
There are two fans included with the cooler which are PWM controlled Cooler Master models which can spin up to a maximum of 2400 rpm. Cooler Master thoughtfully include enough screws to install two further fans in a push-pull configuration.