Alpenfohn Mount Doom K2 - Was used for an i5 4670K (7 years) and a 5800X (a few months, with an AM4 mounting kit for the Matterhorn...) Miraculously, the Meshify 2 allows for sliding fans up or down as you please, so down they went. The rear fan needed to go particularly low, such that the bottom to screws wouldn't line up with their holes. I believe I can find rubber screw replacements that can stretch through the partially showing holes if there is any vibrational noise. The VRM fan clearly does something, and temperature improvements will follow the more even FPM on either side of the VRM heatsink, but we also want to be clear that a top-mounted radiator would also benefit the VRM. This is something we simulate in our test setup. VRM Thermals

A selection of motherboards interferes with the cooler. Below is a list of motherboards which have been confirmed to have this problem. The next test will be for the VRM fan. For this, we’re going to start with an overlay demonstrating the linear feet per minute flow, often called FPM or LPM, as measured with a hotwire anemometer at the edge of the chassis for the cooler. The measurement is taken at an angle toward the VRM heatsink. We measured at a few points and under a few conditions. The nature of a review cycle (while a product is relevant) typically dictates that there’s no means to realistically test for endurance or age. We can revisit in the future if needed, but that’s the only question mark left after the review process: Arctic’s pump design is new, something we’ll look at in our tear-down video coming up shortly, and a new design means we have no reference point for endurance and reliability. In general, liquid coolers outlive the usable life of the system, and potentially two systems, but those that fail do so in a much more visible or catastrophic fashion. Failures are overall rare, however, and that’s always important to note. We’ll send you to our Air vs. Liquid cooler content for more of an explanation on this front.

Typical Apple Innovation…

AIO : Arctic Liquid Freezer II 420 A-RGB. (offset -A, Top mount, Fan Set to exhaust, AIO came with the fans mounted as advertised). Small fans have the reputation of being particularly loud and not very durable; that’s why we set out to develop a quiet, sturdy diagonal fan, especially for the Liquid Freezer II. We’re 100% convinced that this 40 mm fan is just as durable as our other case fans. If the fan doesn’t live up to our claims, our customer service team will send you a replacement free of charge (without you having to replace the entire unit). Plus, our sophisticated cable management hides the PWM cables of your radiator fans in the sleeving.

Arctic doesn't state how much heat wattage are they suitable for, but surprisingly they provide some comparison data. Have you noticed that both coolers achieve the same CPU temp on the graphs Small fans have the reputation of being particularly loud and not very durable; that’s why we set out to develop a quiet, sturdy diagonal fan especially for the Liquid Freezer II. We’re 100% convinced that this 40 mm fan is just as durable as our other case fans. If the fan doesn’t live up to our claims, our customer service team will send you a replacement free of charge (without you having to replace the entire unit).

The manual for the case has a good set of example configurations and dimension considerations included. that is, both keep the CPU temp at 50 degrees in the same hardware setup. There's only a visual manipulation to deceive you that the 420 performs better (the axis starts at 45 degrees).