Uploaded July 2025 | Updated September 2026, 3 weeks ago

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The Cooler Master Atmos II is finally arriving. This AIO liquid cooler will come in 240 and 360mm models, and a variety of pump top options. In this review I'll cover the performance of the 240 and discuss why this new cooler is fun, perfomance, and compatibility- all in one.

Atmos II 240
Atmos II 360

Test Specs
Case amzn.to/42wWe7R
Board amzn.to/3FXnrYv
285K amzn.to/3RBfo64
DDR5 amzn.to/3IOJXnD
Also tested with: amzn.to/44Ol0A7

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0:00 Intro
1:22 Overview
5:00 Mounting Hardware and new 1851 Offset
6:42 Performance Testing
8:42 VRM Fan Cover?
9:19 Fan Sound Samples
10:21 Wide appeal
11:00 Hiccups
11:52 Retail Versions and pricing
13:25 In short