Cooler Master has managed to get a lot right with the Seidon 120XL. First up, its size is big enough to offer good cooling without requiring a large case or lots of room for the install—unlike bigger AIO liquid coolers such as the Corsair H110. The mounting hardware is superb, being one of the easiest coolers to install to date on the LGA2011 platform. The big difference here is that uninstalling the cooler is also a breeze, which is where competing Asetek manufactured units tend to be at a disadvantage, and the Y-cable for the fans and the rubber gaskets to lessen vibration from the fans both make great additions. Cooler Master even went so far as to sleeve the wires on the fans and pump to create a nice and clean appearance. The fact that users can also install memory modules with tall heatsinks without worry, much like with other AIO liquid coolers, is a plus. The Cooler Master Seidon 120XL really does have a lot going for it with all of the above taken into account, and its performance under load, where it comes in third on the Prime 95 test, also makes the cooler a winner for enthusiasts and gamers. This is especially true at its price tag of $89.99, as it is only 5°C behind the Corsair H110 that is far more expensive. The Seidon 120XL even manages to beat its closest competitor, the Corsair H90, in my tests.

That said, Cooler Master did miss the mark on a few things. The fans are loud and make use of rifle bearings—bearings that are only a little better than sleeve bearings. The use of fans with ball bearings or hydro dynamic bearings would have been nice considering the extra effort Cooler Master has already put in by sleeving the cables for a nice and clean look. The corrugated tubing is a bit of a pain as well, and the use of the more flexible rubber tubing would definitely be a welcome improvement as it sports better and cleaner looks, but the noise under full load still has got to be the biggest drawback when looking at the Seidon 120XL.

The Cooler Master Seidon 120XL is, in the end, a solid option if users are looking for a CPU cooler that gets the job done. It offers great cooling at a good price, with lots of extras that really sweeten the deal.