Best 240mm AIO liquid coolers in 2021

240mm AIO liquid coolers present an excellent middle ground for users who want an AIO cooling solution. While not as performant as 360mm solutions they are quite close in performance. And they can handle almost every CPU out there. Unless you don’t need a cooler for an overclocked 10900K you’ll most likely be fine with a 240mm AIO. On the flipside, 240mm coolers can fit into a much larger assortment of cases compared to the aforementioned 360mm coolers. 240mm AIO coolers can also be interesting to SFF builders since they can get almost the same performance as with a 280mm cooler while actually being able to fit a 240mm radiator inside most Mini-ITX cases.

Due to the factors listed above, the 240mm AIO cooler market is teeming with a ton of different models. Finding the best 240mm AIO liquid cooler can be a pain since so many models perform very similarly. The common thing is for the more affordable options to offer approximately the same or even better thermal performance than high-end AIO cooling systems. So, if your mission is to discover the best 240mm AIO CPU coolers on the market in the shortest time possible, scroll below and check out our list. It includes the best overall performers, the best bang for the buck picks, excellent RGB options, as well as a couple of silent coolers. Let’s begin with the best 240mm AIO cooler you can get right now.

1. Arctic Liquid Freezer II 240: Best overall 240mm AIO liquid cooler

DIMENSIONS
240mm (98 × 78 × 53)
FANS
2
NOISE
22.5 dB(A)
SPEED
1800 RPM

Arctic sure knocked it out of the park with their Liquid Freezer II lineup. The company managed to achieve impressive performance along with excellent noise levels and to combine it all into a solid-looking package that won’t break the bank.

The Liquid Freezer II 240 is, at the moment, the best bang for the buck 240mm AIO liquid cooler you can get. And, unless you’re looking for the absolute top performance or inaudible noise levels, this is the best AIO CPU cooler you can get right now. It’s perfectly suitable for virtually every CPU you can throw at it.

And unless you have a 10900K, the 240mm version of the Liquid Freezer II is perfect for an optimal balance between thermal performance and noise levels. In other words, get this cooler if you want a no-frills solution that can handle most CPUs at base or OC frequencies and that’s pretty silent while doing that.

The downsides include poor availability and inflated price, mostly thanks to the excellent price to performance ratio. Also lack of RGB LEDs, which turns into a plus for many users. If you want an AIO that performs similarly and isn’t much pricier check out the EVGA CLC 240NZXT Kraken X53, or the Corsair iCUE H100i RGB Pro XT. All of these options also include a touch of RGB on the CPU block.

2. Fractal Design Celsius S24: Best budget 240mm AIO liquid cooler

DIMENSIONS
240mm (284 × 122 × 31)
FANS
2
NOISE
32.2 dB(A)
SPEED
2000 RPM

The Arctic Liquid Freezer II 240 can be considered a budget AIO cooler, but the current price situation puts it clearly above the budget ceiling. If you want a cheap AIO cooler that performs above its price point get the Fractal Design Celsius S24. While it has been outmatched by the super popular Arctic solution the Celsius S24 still is an excellent AIO cooler. You can pair it with most modern CPUs and you’ll get excellent base and OC thermal performance.

If you want something even cheaper that can handle six-core and eight-core CPUs you could get the Cooler Master MasterLiquid 240. It’s a bit old design that has solid performance and costs as much as mid-range air coolers. Pretty good buy if you just plan on running the CPU at stock clocks or applying slight OC. Finally, if you want something pretty but affordable check out the Cooler Master MasterLiquid ML240 Mirror. The ARGB mirror effect on the CPU block looks attractive without being in-your-face. And the cooler is a solid performer, good enough for most CPUs, overclocked or not.

3. Corsair iCUE H100i Elite Capellix: Best RGB 240mm AIO liquid cooler

DIMENSIONS
240mm (277 × 120 × 27)
FANS
2
NOISE
37 dB(A)
SPEED
2400 RPM

Okay, now that we’ve listed the best AIO coolers that come without (or with a slight) lightshow, let’s move on to the best RGB 240mm AIO coolers. Here, we’re looking at both design and performance and the current champion of the 240mm AIO market is the Corsair iCUE H100i Elite Capellix. This is one slick looking cooler equipped with richly lit RGB fans that also has pretty solid performance.

The iCUE H100i Elite Capellix is in the middle of the pack regarding thermals but noise results make it one of the quietest 240mm AIO coolers on the market. Combine the two and you get a capable cooler that can handle pretty much any current CPU, at base or OC frequencies, is extremely quiet, and looks amazing. The price is a bit high but considering the quality of the light show provided, perfectly understandable.

Now, if we look at similarly priced alternatives we have the impressive-looking Thermaltake Floe Dual Ring RGB 240 that costs more and isn’t as quiet. Next up is the good old Corsair H100i RGB Platinum. Very similar in design to the new Capellix but also a bit better in thermal performance while having similar noise levels. If you want an exceptionally quiet (for a 240mm) AIO cooler that also has lots of RGB, the Cooler Master MasterLiquid ML240R ARGB is an excellent buy. Last but not least we have the Id-Cooling Pinkflow 240 for everyone looking for lots of pink along with RGB hearts on the CPU block. And if you want a white AIO cooler, check out the DEEPCOOL Castle 240EX White.

4. Cooler Master MasterLiquid ML240L V2: Best budget RGB 240mm AIO liquid cooler

DIMENSIONS
240mm (277 × 120 × 27)
FANS
2
NOISE
27 dB(A)
SPEED
1800 RPM

The best budget 240mm RGB cooler is arguably the Cooler Master MasterLiquid ML240L. It’s cheaper than our budget non-RGB pick while offering decent performance for the price. It’s nowhere close to the Celsius S24 is both thermals and acoustics but with the S24 you don’t get pretty lights. Overall, for the price, this is an excellent RGB AIO cooler. You can also get the original version of the cooler that costs about the same.

If you’re ready to pay more take a look at the MSI MAG Coreliquid 240R. You’re getting much better thermals and much lower noise in a package that looks very similar to the ML240L. Next, we have the ID-Cooling Auraflow X 240, another cheap RGB cooler that can handle most CPUs at the cost of increased noise. Finally, the ID-COOLING Zoomflow 240X Snow is the prettiest white RGB cooler we’ve found. It’s in the middle of the pack performance-wise and can be quite loud when under heavy load. But if you’re into white color, that design can be a perfect match alongside a white board and a white case.

5. Cooler Master MasterLiquid ML240R ARGB: Best quiet 240mm AIO liquid cooler

DIMENSIONS
240mm (275 × 119 × 27)
FANS
2
NOISE
SPEED
2000 RPM

And for the end of this list, we’re left with the best quiet 240mm AIO cooler. Before we continue, a word of advice. If you want absolute silence even under heavy loads and you happen to have a high-end, overclocked, CPU, get a 360mm AIO. 240mm radiator is just too small to handle high-end overclocked CPUs quietly. But if you own something like the Ryzen 5 5600X, last-gen CPUs such as the Ryzen 5 3600 or Ryzen 7 3700X, or non-K Intel CPUs, the Cooler Master MasterLiquid ML240R is one of the quietest AIO coolers on the market. As you can see here, it matches the latest and greatest Corsair H100i Elite Capellix, which is one of the quietest 240mm AIO coolers around, while costing about 15 percent less.

On top of that, it has a pretty respectable cooling performance and it is one of the prettiest RGB AIO coolers out there. The price is also perfectly acceptable. A bit high but not as high as on premium 240mm RGB AIOs. All that with a performance in line with most high-end RGB coolers. If you don’t care about RGB the Liquid Freezer II 240 is an excellent choice for quiet performance. There’s also our budget pick, the Celsius S24, which is also very quiet in most use cases. Finally, the Corsair iCUE H100i Elite Capellix offers a bit better combination of thermal performance and noise levels, but it also costs more.