Atmos Stealth 360 AIO Liquid CPU Cooler, Mobius Fans

Simply Amazing. I've never been one afraid to spend on my PC, but also valued reliability and above all, noise. As such, I've firmly been in the Noctua (with the occasional deviation) air-coolers, culminating most recently in the NH-D15 G2... an absolute beast of a cooler that overwhelmed everything in my case, made it hard to work on anything, and was way noisier than I expected. So after a TON of research, this replaced it. ...and man, is it quiet. Definitely nothing flashy about it if you're looking for RGB (there is zero), but I have RGB in the other elements of my case - I don't need it everywhere. What this DOES give me is the ability to keep both fans and pumps turned down to inaudible (on a 9800X3D), which I love. I can hear the pump if I put my ear next to it, but with the case on? Nada. All this, while dropping the ambient temps of my CPU by around 5C at idle, and way more at load (while being quieter at every level). Highly recommend if you value silence.

I'm using this to cool my 7950x3d. Granted, it doesn't need a 360mm AIO, but I care more about the noise the fans make. The Atmos Stealth is quiet as a mouse, I can barely hear it during day to day productivity tasks. It keeps temps. low in the 50s. The only time the fans become audible is during gaming sessions. Note, at full blast, these fans will be loud and sound like an industrial blower.

Ice cold. Quiet. Easy to install. Hadn't used liquid cooling before, but upgrading from an intel gen 7 to a Ryzen 9800 required new mounts. This works, keeps the new processor cooler than the old Cooler Master fan+radiator setup on the old processor and is quieter. Plus it's cheap.

Been great. Temps are stable at 37-42° F depending on what programs I run. It's worth looking in to.

This cooler has top tier performance for it's price point. My computer temps running a 9800x3d CPU and GTX 5080 for GPU has been under 60c even on the highest of loads. Mounting this cooler was standard as other coolers, yet the instructions are clear and easy to follow. This product doesn't have any RGB however that is what I prefer, since I dislike any RGB lighting nowadays and with the Stealth in this cooler's name, it has no RGB lighting which is perfect. Would recommend other Cooler Masters AIO for future pc builds as well.

Incredibly easy to install and so quiet! I accidentally had it running 100% and was still impressed on how quiet it was now with the proper fan curve I can barely hear it.

Really great cooler replaced my NZXT Kraken 360. The only negative is the software is kinda janky.

Finally received this AIO and installed. It is pretty simple and hard to not get right. The temps are superb. HWinfo registered a minimum of 29C on 1 CCD of my 9950x3d during day and typical temperatures while office work are 30-35C. The main event is AIO pump which is SILENT, you really need to put ear next to it almost in a couple inches to hear anything and the fans are really great to. You don't hear them most of the timet, but then you do - they work great.

Right, this Cooler Master AIO. It's not a toy, it's a thermo-nuclear chiller. It's doing a proper job of keeping my R7 7800X3d (or i9, whatever the bloody thing is) cooler than a vampire's chest. High performance, quiet fans that don't whine —that's five stars straight off the bat. The packaging was top-tier. Built like a brick privy, too. Radiator and fans are solid. They even packed a proper tube of thermal paste—the good stuff, not that cheap muck. And everything is lousy with labels, so even a muppet could figure out where the bits go. Top marks for that Now for the pain: the installation. This pump is a beast, looks like a small grenade, and shoving it into that Corsair 2000D case felt like trying to put a rhino in a handbag. The whole rigmarole with the Strix X870i was a headache, so clear some space and pour a stiff drink before you start. And the wiring? Diabolical. It's a rat's nest waiting to happen. They give you a Rolls-Royce of a cooler, then cheap out on the bloody cable management. Sort it out, Cooler Master. Practical Verdict: If you need serious cooling, this is the business. Just be prepared for a bit of a scrap getting it fitted. The performance is worth the struggle.

Super quiet and keeps my overclocked and undervolted 13700k super cool ! 😎

ere is my brand new computer in September 2025: It works perfectly! Make sure you update the BIOS with USB flashdrive first, otherwise you might get a black screen with the 5090. This is really important. Case : Corsair 5000D Cooler : Cooler Master Atmos 360 PSU : Corsair HX1200i CPU : AMD Ryzen 9 9950x3D Memory : Corsair Vengeance DDR5 2x48 6000mhz CL30 SSD : 9100 Pro (My mistake I wasn't aware of the included heatsink in the x870e-e) go for regular 9100 instead. MotherBoard : Asus Rog Strix x870E-E VideoCard: Asus Rog Astral Gforce RTX 5090 OC

Well made AIO with no unnecessary lighting.

Not as whisper quiet as they claim. Pump needs to be at 50% or below to be inaudible. Works great, but don’t buy into the marketing about how quiet it is.