Closed-loop (All-in-One) CPU water coolers seem to be a dime a dozen these days, but they're far from identical to each other. Each cooler will serve its purpose, whether you're cooling an HTPC or your monster gaming rig. AIO coolers become the ultimate cooling solution to those who want to toy with their system, or just cool it more efficiently than what air can, but don't really want to mess around with building a custom water cooling loop. Cooler Master is a well-known player in the cooling market, and today we're going to take a look at their 280mm Nepton 280L AIO cooler, which was released earlier this year.