Cooler Master MasterLiquid 240 Atmos デュアルチャンバーポンプ高風量・長寿命ファン搭載 240mmラジエーターサイズ簡易水冷 CPUクーラー MLX-D24M-A25PZ-R1

This article takes a detailed look at the Cooler Master MasterLiquid 240 Atmos デュアルチャンバーポンプ 高風量・長寿命ファン搭載 240mmラジエーターサイズ 簡易水冷 CPUクーラー MLX-D24M-A25PZ-R1, covering specs, compatibility, and the mistakes builders actually make with it.

Overview

The Cooler Master MasterLiquid 240 Atmos (model MLX-D24M-A25PZ-R1) is a 240mm all-in-one liquid CPU cooler built around a dual-chamber pump. The short verdict: it suits Core i7 / Ryzen 7 class builds in cases that cannot physically accept a 360mm radiator.

If you plan to run a Core i9 or Ryzen 9 at full power with an overclock, a 240mm radiator is the wrong starting point regardless of pump design.

A dual-chamber pump splits the pump head into two sections, keeping the cool liquid heading toward the CPU separate from the warm liquid returning from the radiator. In a conventional single-chamber design the returning coolant mixes directly above the die, nudging up the temperature of the water that reaches the cold plate.

This is a real but incremental improvement, not a way to make a 240mm behave like a 360mm.

The cooler ships with two SickleFlow Edge 120mm fans rated up to 2500 RPM, a quoted noise level of 27.2 dBA, and a 160,000-hour MTTF.

ARGB Gen2 LEDs in the pump head sync through a 5V ARGB header. The pump top cover is removable, so owners with a 3D printer can print a custom lid.

On Amazon.co.jp the product held a 4.6 out of 5 rating across 319 reviews (92% positive) as captured on 3 June 2026.

Compatibility Guide

Supported sockets are Intel LGA1700, LGA1200, LGA1151, LGA1150, LGA1155, plus AMD AM5 and AM4. That covers current Intel 12th-14th generation and Ryzen 7000/9000 parts as well as older builds, so the cooler is likely to survive a CPU upgrade.

Sockets not on that list - Intel LGA1851 or HEDT platforms, for example - are not listed as supported, so check the manufacturer's current compatibility table before buying.

Wiring splits three ways: a 3-pin connector for the pump, 4-pin PWM for the fans, and a 3-pin 5V ARGB lead for lighting. The most common mistake here is the ARGB connection.

Boards that only have a 4-pin 12V RGB header will sometimes physically accept a 3-pin 5V plug, and powering that on destroys the LEDs. Confirm the 5V / D / blank / G pin layout first.

Without a 5V ARGB header you either use a separate controller or simply run the default lighting.

Physical clearance is the other trap. The radiator measures 277 x 120 x 27 mm, and that 27mm is the radiator alone - add roughly 25mm of fan thickness, so plan for about 52mm of depth.

Top-mounted installs tend to collide with VRM heatsinks and tall memory; front-mounted installs collide with drive cages and front-panel cabling. Do not rely on a case spec sheet that only says "supports 240mm radiators" - look for the stated radiator-plus-fan thickness.

The listed 24 W pump power draw is high for an AIO pump on its own and may cover the whole unit including fans. Either way it can exceed what a single motherboard header supplies (often around 1A / 12W), so connect the pump to the AIO_PUMP header and route the fans separately through fan headers or a splitter.

Product Info

rmation

The Amazon.co.jp price was ¥16,500 as captured on 12 June 2026.

That is normal to slightly above average for a 240mm ARGB AIO, and reasonable given the five-year warranty. AIO pricing swings by thousands of yen during sales, so check the product page for the current figure.

The listed eBay US price is an order of magnitude out of line for this product class. Overseas marketplace listings often reflect resale pricing or a different bundle, so this article does not treat that figure as reliable.

User ratings stood at 4.6 out of 5 from 319 reviews (92% positive) as of 3 June 2026.

A product holding 4.6 across 300-plus reviews is unlikely to have severe defect or installation problems.

How It Compares

In the same 240mm bracket, models like the NZXT Kraken Elite 240 offer an LCD pump head that this cooler cannot match for on-screen flair. The MasterLiquid 240 Atmos answers with a swappable pump top you can 3D print yourself - building your own look rather than buying a screen.

That is purely a matter of taste.

If raw thermals are the priority, the same money buys a 360mm AIO or a dual-tower air cooler such as the Thermalright Peerless Assassin series. Radiator area dominates, so a 360mm will usually win outright when your case allows it.

The 240mm makes sense when 360mm does not fit, or when a tall air cooler would foul memory or the side panel.

Recommended Users

This is the right cooler for someone running a Core i7 or Ryzen 7 under sustained gaming or video-editing loads in a case limited to 240mm. It also suits builders who care about interior aesthetics through ARGB, and it is genuinely unique for anyone with a 3D printer who wants a custom pump lid.

Mid-tower builds with front 240mm mounting, and tempered-glass or low-clearance cases where air cooler height is a problem, are the natural fit. The five-year warranty is reassuring for anyone keeping the same build for years.

Before You Buy

The core compromise is the 240mm size. For a Core i9 or Ryzen 9 pushed hard, clever pump architecture does not replace radiator surface area.

If your case takes a 360mm, take the 360mm. Expecting "360mm performance because it's dual-chamber" leads to disappointment.

Noise deserves a warning too. The quoted 27.2 dBA is a specific-condition figure; fans that reach 2500 RPM are clearly audible at full tilt.

Plan on setting a fan curve in BIOS or software and living around 1200-1500 RPM. Pump hum never goes fully away on any AIO - if near-silence is the goal, a large air cooler will satisfy more.

Longevity works differently from air cooling. The 160,000-hour MTTF applies to the fans, not the pump or coolant.

AIOs are maintenance-free but consumable: coolant slowly permeates out and pumps wear. The five-year warranty helps, but this is not a ten-year fit-and-forget part.

Mounting orientation matters as well - front intake favors CPU temperatures, top exhaust favors everything else.

One last note on the retail listing. Amazon's registered product metadata (manufacturer, brand, model number, ASIN) occasionally carries data from a different item.

Before ordering, confirm from the images and title that you are getting MLX-D24M-A25PZ-R1 and the 240mm version, since the series also includes a 360mm model. Prices shown on the page take precedence over the captured figures quoted here.

FAQ

Q. Can it handle a Core i9 or Ryzen 9? A.

It will run, but it is not recommended. A 240mm radiator can hit thermal throttling under sustained all-core load.

With a power limit applied it becomes practical.

Q. What if my motherboard has no ARGB header? A.

Cooling works normally; you just lose lighting sync. Never plug it into a 4-pin 12V RGB header - that will destroy the LEDs.

Q. Where do the pump and fans connect? A.

Pump to AIO_PUMP (or CPU_FAN at a fixed 100% if unavailable), fans to separate headers. Keep the pump at full speed and tune the fan curve instead.

Q. Front or top mounting? A.

Front intake gives lower CPU temperatures but dumps radiator heat into the case, raising GPU temperatures. Top exhaust runs slightly warmer on the CPU but keeps the case cooler.

Avoid routing the tubes above the radiator.

Q. Is thermal paste included?
A. Yes - paste, mounting hardware, and screws are in the box. Buy fresh paste if you ever remount it.

Q. 240mm or 360mm? A.

Take the 360mm if your case supports it with at least 30mm of clearance. If it does not, or cabling and drive bays get in the way, the MasterLiquid 240 Atmos is a sensible landing point.