There once was a time when the idea of water-cooling was seen as about as outlandish as the way we currently look at people jamming liquid nitrogen into their systems for overclocking challenges. Water-cooling also used to be rather tricksy and damned expensive to boot, but not so any more. Adding to the glut of closed-loop liquid CPU coolers is Cooler Master's latest series, the Seidon. This Seidon 120M version is the single-fan setup using one 120mm fan with a radiator of the same size, much like the pricier Thermaltake Water 2.0 Performer. At less than £50 this water cooler is piling into serious air-cooling territory, and with the impressive thermal performance of even these budget liquid chillers it's getting harder and harder to recommend active air-coolers. There's another string to the Seidon 120M's bow and that's its small footprint in your PC. A £50 air-cooler is likely to have a hefty heatsink setup even before you start adding in the primary or secondary fans, and if you're not sporting some low-profile RAM, things can get tricky. With the Seidon's tiny waterblock there's no such worry, and the radiator is only around double the depth of the 120mm fan you've likely already got exhausting hot air out of the back. It also means the Seidon 120M is perfect for the burgeoning small-form factor performance PC market. With the rise in quality mini-ITX boards and chassis you also need coolers that aren't going to take up half the case. So, in practical terms, Cooler Mas
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