CoolerMaster Atmos 240 Review

The MasterLiquid Atmos 240 is 240mm class AIO liquid cooler, designed to be eco-friendly and customisable. It uses Cooler Masters signature dual chamber pump design and represents the best of modern AIO liquid cooling. Cooler Master’s Atmos 240 is priced at $134.99 in the US and £129.99 in the UK.


Product NumberMLX-D24M-A25PZ-R1
Exterior ColorBlack
CPU SocketLGA1700, LGA1200, LGA1151, LGA1150, LGA1155, LGA1156, AM5, AM4
Radiator MaterialAluminium
Radiator Dimensions277 x 119.6 x 27.2mm
Pump Dimensions84.9 x 81 x 53.15mm
Pump MTTF>210,000 Hours
Pump Noise Level12 dBA (max)
Pump Connector4pin (PWM)
Pump Rated Voltage12 VDC
Pump Power Consumption3.84W
Fan Dimensions (L x W x H)120 x 120 x 25 mm / 4.7 x 4.7 x 1 inch
Fan Quantity2 PCS
Fan Speed690-2500 RPM ± 10%
Fan Airflow70.7 CFM (max)
Fan Noise Level27.2 dBA (max)
Fan Pressure3.61 mmH₂O (max)
Fan Bearing TypeLoop Dynamic Bearing
Fan MTTF>160,000 Hours
Fan Power Connector4pin (PWM)
Fan Rated Voltage12 VDC
Fan Rated Current0.2A
Fan Safety Current0.3A
RAM ClearanceN/A
Warranty5 years
Cooler TypeLiquid Cooler
Radiator Size240



The includes fans are on quieter side of AIOs we’ve tested. This allows the fans to operate at higher RPM, while maintaining the same noise levels.


The CPU pump block measures 53mm in height and around 43mm with cap removed, making it a very solid choice for ITX cases. The pump top cover is customisable with your own 3D-printed creations. This is very cool feature, but we feel few will take advantage, due to no / limited access to 3D printing.


While we tried to explore Cooler Master’s MasterCTRL software. Sadly, the v1.0 public software release wouldn’t launch on either of our AM5 systems.


Testing is carried out on BC1 (open testbench), using the following hardware, in 20°C ambient room temperature. We noise normalised the fan speeds to 35dB(A) at distance of 50cm. This helps eliminate brute force cooling from higher RPM fans.

CASEBC1 (Open Testbench)
MOTHERBOARDMSI B650M Mortar WiFi (paid link)
CPUR9 7900X (paid link)
CPU COOLERMasterLiquid Atmos 240
GPUGigabyte RX 6900XT Gaming OC (paid link)
RAM32GB TeamGroup Vulcan DDR5, 6000MHz, CL38 (paid link)
PSU SilverStone SX1000R (paid link)


We use Cinebench R23 multicore (stability test), for period of 30 minutes. This provides worse case scenario for a given CPU. CPU coolers are tested across range of CPU’s for data validation and to reduce risk of errors. This also helps account for variables between CPU platforms.


The MasterLiquid Atmos 240 is one of the best 240 AIOs currently available, both in terms of thermal performance and noise levels.

Performance Unnecessary extras that increase AIO pricing, including customisable pump block, ARGB & MasterCTRL hub.
Pump height (53mm), roughly 43mm with cap removed.Only available with RGB.
4pin PWM controlled pump.Fan splitter is low quality and very stiff. It feels out of place vs. other cables.
Quiet pump, even at full speed.
Textured radiator surface finish.