Cooler Master USA Liquid 240L Core 240mm Close-Loop AIO Liquid Cooler, ARGB Sync, Gen S Coldplate Pump, 120mm PWM, CryoFuze 14W/mK, AMD Ryzen AM5/AM4, Intel LGA 1700/1200 (MLW-D24M-A18PZ-R1), Black

Pick the wrong cooler for your CPU and you'll spend the next few years watching your processor throttle under load, wondering why your render times are longer than they should be or why your gaming PC sounds like a jet engine at full tilt. It's not a dramatic problem. It's just a constant, low-level annoyance that costs you performance you've already paid for. The Cooler Master MasterLiquid 240L Core sits in the entry-level AIO bracket, priced to appeal to anyone stepping up from a stock cooler or a basic air tower. But does it actually deliver, or is it just a pretty set of fans bolted to a thin radiator?

I've been running this unit for three weeks across a couple of different test platforms, including an AMD Ryzen 7 7700X on AM5 and an Intel Core i5-13600K on LGA1700. Both are chips that can genuinely stress a budget cooler, and that's exactly the point. If the 240L Core can keep either of those under control at stock settings, it earns its place. If it can't, you need to know before you buy. The market at this price point is competitive. DeepCool, Arctic, and ID-Cooling all have 240mm AIOs fighting for the same wallet, so context matters here.

This review is comparison-led because that's how you should be thinking about it. The 240L Core doesn't exist in a vacuum. It exists alongside the Arctic Liquid Freezer II 240 and the DeepCool AK620 air cooler, both of which are serious alternatives at similar or lower price points. I'll get to those comparisons properly, but keep that competitive landscape in mind as we go through the numbers.

The fans are 120mm PWM units running up to 2000 RPM, which is fairly standard for this class. The ARGB lighting is synced via a 3-pin ARGB header, compatible with most major motherboard RGB ecosystems including ASUS Aura Sync, MSI Mystic Light, and Gigabyte RGB Fusion. Cooler Master also supports their own MasterPlus+ software if you want more granular control. The CryoFuze thermal paste is pre-applied to the coldplate, rated at 14W/mK, which is a genuinely decent thermal conductivity figure for included paste. Most budget AIOs ship with generic paste that's considerably worse.

Compatibility is broad. AM5 and AM4 are both supported natively, as are Intel LGA1700 and LGA1200. The mounting hardware is all in the box, and Cooler Master's installation process is reasonably straightforward, though I'll note the AM5 bracket requires a bit more patience than the Intel side. The tubing is sleeved and has enough length to reach most standard ATX cases without feeling stretched. It's not the most premium-feeling build quality you'll find, but nothing about it feels like it'll fail on you either.

In practice, what this means for users is a slightly lower profile pump head, which can help clearance in tighter cases, and a pump that runs noticeably quietly at idle. I measured pump noise at around 25 dBA in a quiet room at idle, which is genuinely unobtrusive. Under load, the fans become the dominant noise source anyway, so the pump design matters more for idle and light-load scenarios. For anyone building a quiet PC for office work or light gaming, that's actually a meaningful benefit.

The coldplate itself uses a micro-channel copper construction, which is standard for this class. The contact surface is machined flat and the pre-applied CryoFuze paste covers the die area properly. I didn't need to add additional paste on either test platform, which is one less thing to worry about during installation. Some budget AIOs ship with paste that's either too thick or applied in a pattern that doesn't spread well under mounting pressure. The 240L Core's application looked correct after I removed it for inspection mid-testing.

On the Ryzen 7 7700X at stock settings with PBO disabled, the 240L Core held the CPU to 78 degrees Celsius under a sustained Cinebench R23 multi-core run. That's a solid result. With PBO enabled and the CPU pulling closer to 130W, temperatures climbed to 88-91 degrees, which is within AMD's safe operating range but getting warm. Fan speeds at that point were around 1600-1700 RPM, audible but not loud. For gaming workloads, where the 7700X typically sits in the 65-80W range, temperatures stayed comfortably below 75 degrees with fans barely spinning above 1200 RPM.

The Core i5-13600K was the harder test. Intel's 13th-gen chips are notorious for their power consumption under multi-core load, and the 13600K can pull well over 150W in Cinebench. The 240L Core managed 91 degrees at peak during a 10-minute Cinebench R23 run, with fans hitting 1800 RPM. That's not throttling territory, but it's close to the edge of what a 240mm AIO should be asked to do with a chip like this. For gaming, where the 13600K's power draw is much more modest, temperatures were fine, sitting in the low-to-mid 70s. If you're pairing this cooler with a high-TDP Intel chip and plan to run sustained productivity workloads, a 280mm or 360mm AIO would give you more headroom.

Installation on AM5 requires using the included backplate and standoffs, replacing the stock AMD backplate. It's a bit fiddly compared to the Intel side, where the LGA1700 mounting system is more straightforward. I'd recommend having a second pair of hands for AM5 installation, or at least a way to prop the motherboard up while you tighten the screws. The instructions in the box are clear enough, but the AM5 bracket has a specific orientation that isn't immediately obvious. Once it's on, it's solid.

LGA1200 support means older 10th and 11th-gen Intel builds can use this cooler too, which is useful if you're upgrading a cooler on an existing system rather than doing a full platform build. The mounting hardware for all four sockets is included in the box, clearly labelled, and nothing feels cheap. Cooler Master has been making cooler mounting kits for long enough that this part of the product is genuinely well-sorted. One thing to check before buying: your case needs to support a 240mm top or front radiator mount. Most mid-tower ATX cases do, but compact mATX cases can be trickier.

Motherboard sync works well with ASUS Aura Sync and MSI Mystic Light in my testing. Gigabyte RGB Fusion was slightly less reliable, occasionally reverting to a default rainbow cycle after a system restart, but this is a known quirk with Fusion rather than a specific 240L Core problem. If you're not fussed about RGB sync and just want a static colour or off, you can set that via the 3-pin ARGB header without needing any software at all.

Cooler Master's MasterPlus+ software gives you fan curve control, RGB customisation, and pump speed monitoring. It's not the most polished software in the world, but it works. Fan curves can be set to temperature-based profiles, and the default profile is sensible enough that most users won't need to touch it. I ran the default profile for the majority of my three weeks of testing and only adjusted it when I specifically wanted to test noise levels at different fan speeds. For a budget AIO, having working software at all is a bonus rather than a given.

Noise is more interesting. At 1200 RPM, the fans are genuinely quiet, around 28-30 dBA measured at one metre. That's a level where you'd need a quiet room to hear them over typical ambient noise. At 1600 RPM, they're audible but not intrusive, around 35 dBA. At full 2000 RPM, they're clearly noticeable at 42-44 dBA. The fan noise character is fairly neutral, no obvious tonal whine or bearing rattle, which is good. Some budget fans have an unpleasant high-frequency hiss at speed that the 240L Core's fans avoid.

For a typical gaming or productivity build where the CPU isn't constantly at 100% load, you'll rarely hear these fans. The default fan curve keeps them below 1400 RPM for most workloads, and at that speed they're effectively inaudible in a closed case. If you're running sustained rendering jobs or compilation tasks that push the CPU hard for extended periods, the fans will ramp up, but they do so gradually rather than jumping suddenly, which is less jarring. Overall, the noise profile is one of the better aspects of this cooler at this price point.

For the sweet spot of AM5 Ryzen 5 and Ryzen 7 builds, the 240L Core is genuinely well-matched. The Ryzen 5 7600X and Ryzen 7 7700X both run comfortably under this cooler at stock settings, and with modest PBO tuning you still have thermal headroom. On the Intel side, the Core i5-13400F and i5-13600K are good pairings. The i7-13700K is pushing it at stock, and with any power limit removal it's too much for a 240mm AIO.

Case compatibility is the other consideration. You need a case that can mount a 240mm radiator, either at the top or front. Most mid-tower cases handle this fine. Check your case specifications before buying, particularly if you're using a compact mATX case or a smaller form factor. The radiator is 277mm x 120mm x 27mm, which is standard 240mm sizing, so any case listed as supporting a 240mm AIO should work. Tubing length at 400mm is sufficient for top-mount configurations in standard ATX cases without any tension on the fittings.

On the Core i5-13600K at stock with Intel's default power limits, Cinebench R23 multi-core showed peak temperatures of 91 degrees and sustained temperatures averaging 87 degrees over a 10-minute run. That's warmer than I'd like, but the chip wasn't throttling and the fans were managing it. With the power limit manually reduced to 125W (the chip's rated TDP rather than the boosted limit motherboards often apply), temperatures dropped to a much more comfortable 79 degrees peak. This is actually a useful finding: if you're using a 240mm AIO with a 13600K, consider setting a manual power limit in your BIOS rather than letting the motherboard run unlimited power.

I also ran a stress test using Prime95 small FFTs, which is more aggressive than any real-world workload but useful for finding thermal limits. The 7700X hit 95 degrees and triggered AMD's thermal protection briefly before stabilising at 92 degrees with fans at full speed. The 13600K hit 100 degrees and throttled. Neither result is surprising for a 240mm AIO under Prime95, and neither represents real-world usage. For actual workloads, both chips stayed well within safe operating temperatures.

Video encoding is where the cooler gets a proper workout. A 10-minute 4K timeline export in DaVinci Resolve pushed the 7700X to around 85 degrees with fans at 1500 RPM. That's audible but not loud, and the export completed without any throttling. On the 13600K, the same export pushed temperatures to 88 degrees with fans at 1700 RPM. Again, no throttling, but you're aware the cooler is working. For occasional rendering tasks, this is fine. For a machine that's encoding video for hours every day, you'd want more cooling headroom.

Day-to-day desktop use is where the 240L Core genuinely impresses for the money. Idle temperatures in the low-to-mid 30s, fans barely audible, and the system stays cool even during light multitasking. The pump noise is low enough that it doesn't register in normal use. If you're building a PC that spends most of its time on general tasks with occasional gaming sessions, this cooler keeps things quiet and cool without asking much of you. That's exactly what the entry-level AIO bracket should deliver, and the 240L Core does it.

On the Ryzen 7 7700X, gaming temperatures peaked at 72 degrees in CPU-intensive titles like Cyberpunk 2077 and Total War: Warhammer III. Boost clocks were sustained throughout, with the chip hitting its maximum boost frequency consistently. In less demanding titles, temperatures dropped to the mid-60s. Fan speeds during gaming sat around 1200-1400 RPM, which is effectively silent in a closed case. The 7700X is a strong gaming CPU and the 240L Core lets it perform to its potential without thermal compromise.

The Core i5-13600K showed similar results in gaming. Peak gaming temperatures of 74 degrees, sustained boost clocks, and fan speeds that stayed below 1500 RPM in most titles. The 13600K's gaming performance is excellent, and again the cooler wasn't the limiting factor. Where things get more interesting is in streaming scenarios, where the CPU is handling both game logic and encoding simultaneously. Under that combined load, temperatures on the 13600K climbed to 82-85 degrees and fans ran at 1600-1700 RPM. Still within safe limits, still not throttling, but noticeably warmer. If you're a streamer running software encoding, factor that in.

The tubing on the 240L Core is 400mm long and has a good range of motion without kinking. I mounted the radiator at the top of an ATX mid-tower case and had no tension issues. The tubing exits from the pump head at a fixed angle, so you'll want to think about orientation before tightening everything down. Cooler Master's instructions show the recommended orientations, and following them avoids any potential air bubble issues in the loop. The pump head can be rotated after mounting to adjust the logo orientation, which is a small but appreciated detail.

RAM clearance is a non-issue with this design. Because the pump head is compact and sits directly on the CPU socket, there's no overhang onto the RAM slots, unlike some large air coolers. Tall RAM heatspreaders won't cause any problems. GPU clearance is similarly unaffected. The only physical constraint is radiator placement in your case, and as long as your case supports 240mm, you're sorted. Fan orientation matters: mount the fans to push air through the radiator and out of the case for best results in a top-mount configuration.

On the Core i5-13600K, manual overclocking to 5.2GHz all-core pushed temperatures to 95 degrees under Cinebench, with fans at full speed. That's the ceiling. The overclock was stable, but there's no thermal headroom left for anything more aggressive. If overclocking is a priority for you, a 280mm or 360mm AIO gives you the headroom to actually explore what your chip can do. The 240L Core is better suited to stock or lightly tuned operation.

For AMD Ryzen 5 chips like the 7600X, overclocking headroom is better because the baseline power draw is lower. With PBO and a curve optimiser applied, the 7600X stays well under 80 degrees on the 240L Core, leaving room for meaningful frequency gains. If you're pairing this cooler with a Ryzen 5 chip and want to do some PBO tuning, it's a reasonable combination. The cooler won't be the bottleneck. For Ryzen 7 and above, manage your expectations accordingly.

The DeepCool AK620 is a different type of competition: a dual-tower air cooler that often costs less than a 240mm AIO and performs comparably or better in many scenarios. It's bulkier, has no RGB (in the standard version), and can cause RAM clearance issues, but its thermal performance is genuinely impressive. If you don't care about liquid cooling aesthetics and want the best thermal performance per pound, the AK620 is worth serious consideration.

Where the 240L Core wins is on the combination of aesthetics, noise profile, and broad socket compatibility. The ARGB implementation is better than the Arctic's (which has no RGB), and the installation is less physically imposing than a dual-tower air cooler. For a windowed case build where looks matter, the 240L Core makes sense. For pure thermal performance without caring about aesthetics, the Arctic or DeepCool options are stronger. That's an honest assessment of where this cooler sits.

One thing that stands out in that comparison is Arctic's 6-year warranty on the Liquid Freezer II. That's a significant advantage for a liquid cooler, where pump longevity is always a background concern. Cooler Master's 3-year warranty is standard for the category, but if long-term peace of mind matters to you, the Arctic's warranty is hard to ignore. The Cooler Master product page has full warranty terms if you want to check the specifics.

The criticisms that come up repeatedly are worth paying attention to. A handful of reviewers mention pump noise being higher than expected, though this appears to be a minority experience rather than a widespread issue. A few buyers note that the AM5 installation instructions could be clearer, which matches my own experience. There are also a small number of reviews mentioning RGB sync issues with specific motherboards, particularly older Gigabyte boards, which again aligns with what I found in testing.

The more serious complaints are rare but present: a few reviews mention pump failure within the first year, which is a risk with any AIO cooler. This is where the 3-year warranty matters. Cooler Master's customer service response to warranty claims gets mixed reviews, with some buyers reporting smooth replacements and others finding the process slow. That's not unusual for the category, but it's worth knowing. Overall, the buyer sentiment is genuinely positive, and the rating reflects a product that delivers on its promises for most users.

• AM5 installation requires more patience than the Intel side
• Thermal limits with high-TDP Intel chips under sustained load
• 3-year warranty versus Arctic's 6-year cover on a comparable product
• Software (MasterPlus+) works but isn't polished

The main reason to look elsewhere is if you're pairing it with a high-TDP chip and plan to run sustained heavy workloads. The Arctic Liquid Freezer II 240 has better thermal performance and a longer warranty. The DeepCool AK620 has better thermal performance at potentially lower cost if you don't need liquid cooling aesthetics. But for a mainstream gaming or productivity build where the CPU is in the 65-125W range, the 240L Core is a solid, sensible choice that won't let you down.

The honest limitations are real but not dealbreakers for the right buyer. High-TDP Intel chips under sustained load push this cooler to its thermal limits. The 3-year warranty is shorter than Arctic's 6-year cover on a comparable product. And if pure thermal performance is your only metric, the Arctic Liquid Freezer II 240 or a DeepCool AK620 air cooler will edge it out. But for a Ryzen 5 or Ryzen 7 AM5 build, or a Core i5 LGA1700 system, the 240L Core is a well-rounded choice that balances performance, noise, and aesthetics sensibly. It earns a 7.5 out of 10.

The 4.6-star rating from over 300 buyers on Amazon reflects a product that delivers on its promises for the majority of use cases. If your build fits the profile this cooler is designed for, you won't be disappointed. Check current pricing at £13.05 and compare against the Arctic before you commit, but don't overthink it. For most mainstream builds, this is a proper solid choice.