5 Best 420mm AIO CPU Coolers 2023

Finding the best 420mm AIO CPU coolers are essential when buying the best CPU cooler for your gaming rig. You need to ensure that the cooler has a strong airflow design to ensure that the heat generated by your computes CPU is effectively transferred to the fan.

If you want to get the best cooling performance from your computer’s CPU, then it is recommended that you go for a bigger and stronger CPU cooler. However, if you want to save money and don’t mind compromising on the size, you can still get great results from a smaller CPU cooler.

A larger CPU cooler can be more effective than a smaller cooler if you want to keep your computer CPU under a certain temperature. So, in this guide, I have reviewed the best 420mm AIO CPU coolers that will satisfy your needs.

At a Glance:

Best 420mm AIO CPU Coolers

DesignCPU CoolerRetailer
Best Pick1. Thermaltake Pacific DIY Liquid Cooling System RL420
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2. Alphacool Full Copper X-Flow 420mm Radiator Water Cooling Radiators
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Staff Pick3. CORSAIR iCUE H170i Elite Liquid CPU Cooler
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4. Alphacool Eisbaer 420mm Water-Cooling Kits
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Budget Pick5. ARCTIC Liquid Freezer II 420mm All-in-One CPU Water Cooler
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1. Thermaltake Pacific DIY Liquid Cooling System RL420

Best Pick
Feature/SpecificationDescription
Type Liquid Cooling System
Compatibility High-end graphics cards
Design Dual-row flat tube design
MaterialHigh-quality brazing
Durability2-year warranty
PerformanceIdeal for overclocking and faster speeds
Included ComponentsThermal paste

When I first thought about buying a liquid cooling system, I preferred a DIY system as I’d get a better experience.

But I soon realized that the DIY systems were just a marketing gimmick, as they cost hundreds of dollars more than the ready-made liquid cooling systems. So when I saw the Thermaltake Pacific liquid cooling system for $70, I knew I had to try it.

This system has a dual-row flat tube design that is perfect for high-end graphics cards, which are often huge and require a lot of space.

It’s also made of high-quality brazing to prevent any damage from occurring, so it won’t break down when exposed to extreme temperatures.

The Thermaltake Pacific liquid cooling system is so durable that it has a 2-year warranty! It’s perfect for overclocking as it’ll help you get faster speeds, and you can always use the included thermal paste to increase its efficiency.

I’ve used liquid cooling before, which helps control the temperatures. So if you’re looking for a high-quality liquid cooling solution.

Pros

  • Easy to install; screw it in
  • Large radiator size
  • Flexible; can be installed in most cases
  • Easy to clean
  • Affordable; suitable for almost all CPUs

Cons

  • Not suitable for overclocking

2. Alphacool Full Copper X-Flow 420mm Radiator Water Cooling Radiators

If you’re looking for an efficient, quiet radiator that doesn’t take up a lot of space, this is the right choice. I wanted a compact and small radiator to fit in a small room but powerful enough to handle the heat load my computer generates.

This Alphacool Full Copper is ideal for me because of its size, and it’s a perfect fit in the small space where I keep my PC. It’s made of metal, so it’s extremely strong and will last a long time. Its compact design and efficient design make it perfect for any home.

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The copper fins are extremely thin, and they’re spaced very closely. This means that the copper fins are more effective at transferring heat, and fewer are needed.

This makes the NexXxos ST30 ideal for cooling computers because the less copper used, the less noise and vibration.

Its copper chambers are also larger than the ones on other radiators, which means more air is allowed to pass through them. This removes more heat, which is why it’s so efficient.

It’s also incredibly quiet, with only a gentle hum coming from the fan. I recommend this for a small space because it’s quiet and unobtrusive.

With the NexXxos ST30, I get the best of both worlds an efficient, quiet, and compact radiator. It’s a great product for anyone looking for a radiator that won’t take up a lot of space, is silent, and is very efficient.

Pros

  • Very small and compact; perfect for smaller cases
  • Triple fan design; highly efficient
  • Heat pipe; very effective cooling
  • Good performance; quiet operation
  • Stable performance

Cons

  • Small in size; not ideal for a bigger case
  • Not much clearance in the back of the case
  • Hard to install

3. CORSAIR iCUE H170i Elite Liquid CPU Cooler

Staff Pick

One of the best-known names in PC gaming, Corsair, has a solid reputation for making excellent cooling hardware, and its flagship cooling product is the CORSAIR iCUE.

The CORSAIR iCUE H170i Elite is one of the highest-performing liquid CPU coolers I’ve tested, and it has the largest radiator I’ve seen. With 420mm of cooling surface area, it is the perfect cooler for overclocking and high-powered gaming.

The large radiator isn’t just for cooling; it is also the perfect place to put your power supply. This is the cooler to go for if you’re building a new system, then this is the cooler to go for.

The radiator is made from nickel-plated copper, the best material for radiators, as it doesn’t warp or deform.

The radiator is also reinforced with stainless steel, which adds strength and durability. On the front of the cooler is a large LED strip lit by the 33 RGB LEDs on the pump head.

The LED strip can light up your system at night or during dark gaming sessions. The LED strip is controlled by the CORSAIR iCUE Smart RGB Lighting Controller, which is connected to the pump head via USB.

This controller allows you to set the LED strip’s colors, brightness, and modes. There are three lighting modes:

Dynamic RGB

In this mode, the LED strip changes color dynamically to match whatever your mouse is doing.

This is the best mode for casual use.

Static RGB

In this mode, the LED strip stays the same color throughout the entire session. This mode is ideal for when you’re playing a game or working.

Static

In this mode, the LED strip stays the same color throughout the whole session. This is the best mode for hardcore gaming. The CORSAIR iCUE also features an RGB-backlit CMOS camera on the pump head.

This allows you to control the lights remotely and check what your system looks like while running. The remote camera is a small, wireless unit plugging into the pump head’s USB port.

It has an inbuilt microphone, so you can talk to it and adjust settings while you are using it. The camera has a resolution of 640 x 480 and works with Windows, macOS, Linux, and Android.

The CORSAIR iCUE also comes with a CORSAIR iCUE Software Compatible COM Port Adapter, so you can connect it to your motherboard and control the pump head and LED strip via the iCUE software.

This software is compatible with the CORSAIR iCUE Smart RGB Lighting Controller. You can download the free iCUE software here.

This software is compatible with Windows, macOS, and Linux and allows you to control the pump head and LED strip through the included USB cable. The iCUE software is a simple interface, and there are plenty of options to adjust the LED strip.

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For example, you can change the color, brightness, mode, and animation speed. You can also turn off the LED strip if you don’t want it to be lit during the night.

To connect the CORSAIR iCUE to your system, you’ll need to plug the included USB cable into the back of the pump head. This is a 5V 1A power supply, and the iCUE requires 5V 2A or higher.

If you have an older system, the CORSAIR iCUE will work with any 5V power supply, but the power supply will have to be rated for at least 2A to get the best performance. The issue comes with two 140mm fans designed to provide maximum airflow to cool the CPU.

These fans are also PWM-controlled and can run between 400 and 2,000 RPM. This means you have full control over the fan speed, and the cooler will work with any PWM-capable motherboard.

If you are looking to buy a new system, this is the cooler to go for. The CORSAIR iCUE will take up to a 240mm radiator and be the perfect fit for any modern system.

The radiator is built from nickel-plated copper, the best material for radiators, as it doesnt warp or deform. The radiator is also reinforced with stainless steel, which adds strength and durability.

Pros

  • Easy to install; you can do it yourself
  • Attractive design; sleek and modernistic
  • Great value for money
  • Great value for money
  • Extremely quiet

Cons

  • The cable is very short
  • Not suitable for overclocking

4. Alphacool Eisbaer 420mm Water-Cooling Kits

The Alphacool Eisbaer 420 water cooling system is designed for high-end enthusiasts and power users. It features a large radiator with a low-noise fan, which makes it ideal for high-end gaming and overclocking.

Alphacool also sells a range of water cooling kits and systems, including the Eisbaer 420, Eisbaer 400, Eisbaer 240, Eisbaer 120, Eisbaer 80, Eisbaer 60, and Eisbaer 30.

Installation and maintenance are straightforward, but the Alphacool Eisbaer 420 requires a separate pump to cool the radiator. However, the pump is easy to install and should last you for at least ten years.

Alphacool also sells a range of water cooling kits and systems, including the Eisbaer 420, Eisbaer 400, Eisbaer 240, Eisbaer 120, Eisbaer 80, Eisbaer 60, and Eisbaer 30.

If you are looking for a quiet, compact, and high-performance water cooling system, then the Alphacool Eisbaer 420 should be at the top of your list.

Pros

  • Compact; very easy to install
  • Good airflow
  • Simple installation
  • Good performance
  • Easy maintenance
  • Perfect for overclocking systems
  • It has a lifetime warranty

Cons

  • It does not have a good microphone quality
  • It could be a little more flexible

5. ARCTIC Liquid Freezer II 420mm All-in-One CPU Water Cooler

Budget Pick

I’ve been using the Arctic Liquid Freezer II since it first came out, and Im happy to report that it is still going strong. It’s a great AIO water cooler that performs better than almost all other units on the market.

This unit is better than most of the ones that cost twice as much in performance. It can maintain a stable temperature in both low and high-load situations.

There are two fans in the Liquid Freezer II, and they are very quiet too. They also work extremely well in tandem, and the dual-fan setup significantly decreases noise.

When you look at the Liquid Freezer II, you’ll see that it is made from aluminum and features a copper core. The copper core provides the Liquid Freezer II with excellent heat transfer and a stable temperature in low and high-load situations.

It’s the pump that makes the Liquid Freezer II stand out. It uses a unique design that produces less heat than the pumps in the competition. This design also means the Liquid Freezer II has a lower noise output.

The PWM control is great too. The liquid coolers fan speed can be easily controlled via PWM, allowing you to adjust the speed as needed. You can use this to fine-tune the cooling as well. Overall, the Liquid Freezer II is a great product backed by a long warranty and excellent customer service.

Things to consider before buying

There are many factors to consider when purchasing a new computer component. A lot of time and effort goes into designing a new product, and the cost can be high. But with careful planning, you can save money and make sure your purchase is the best for you.

While a great computer can be a fantastic tool, one with a few bugs can be frustrating and time-consuming. Here are some of the most important things you must consider when purchasing a new computer component.

1. Budget

What you can afford is the most important factor. You should always have a budget in mind when planning a purchase; a budget that needs to be lowered will be a bad investment.

Some of the most expensive components are RAM (Random Access Memory) and graphics cards, so if you can’t afford a high-end model, you should stick to an entry-level card or an older-generation model.

You can also purchase multiple parts at a time, such as a CPU, motherboard, graphics card, and RAM.

2. Performance

If you want a powerful computer, you need a powerful CPU and a powerful motherboard to support it. The main difference between CPUs is speed and efficiency. Most of the time, you don’t want to spend your hard-earned cash on a CPU that’s faster than you need.

When deciding, look for a motherboard with the features you need. For example, a motherboard may have the ability to run in SLI mode, but you may not want SLI mode.

If you are still looking for one with the features you want, it may be worth spending a little more on a motherboard with everything you need.

3. Ease of Use

The more features a motherboard has, the more complex the software and setup will be. The last thing you need is a frustrating setup or a computer that’s hard to use. You want a motherboard with easy setup tools and a user manual.

4. Cooling

Heat is the enemy of your computer. The heat generated by a CPU can lead to problems ranging from reduced performance to hardware failure.

There are two types of cooling: passive and active. Passive cooling doesn’t have a fan, so there’s no noise or vibration.

However, it relies on the motherboard and chassis to keep the heat away from the components, so it may not provide the best cooling.If you’re looking for the best CPU cooler, you should look for one that uses active cooling.

5. Compatibility

This is a little “if you don’t know, don’t worry” situation, but it’s worth mentioning.It may need to be fixed if you buy a CPU incompatible with the motherboard.You should also ensure that your CPU is compatible with any software you’ll be using on your computer.

6. Price

Sometimes, the best deals can be found in the discount sections of online stores. You can save a lot of money on a computer by purchasing a cheap model and upgrading later. But be careful to buy one compatible with the motherboard, as it may not be compatible with future components.

7. Warranty

Most manufacturers offer a warranty on their products. If a problem occurs, the manufacturer will replace it for you. However, there’s no guarantee that the replacement will be compatible with your motherboard.

Check the manufacturer’s website to see what the warranty covers.

8. Power Consumption

A good motherboard will have low power consumption to save on electricity bills.

9. Software

You should know what you want to use for your computer for before buying.

For example, if you’re a gamer, you’ll need more powerful hardware than a web designer.

10. Quality

Quality is important. The better a computer is made, the better its performance will be.Buying a cheap model can be a good choice, but make sure it’s made of high-quality materials.

11. Design

There are so many different types of computer hardware and so many different brands.

The design of the casing and the keyboard can be important. You can find a great deal on a well-designed model.

12. Size

A laptop may be better if you want a smaller, portable computer. A desktop or tower-style computer is a good choice if you need a large, powerful system.

Conclusion

In conclusion, a big problem with buying a new PC is finding a good value-for-money deal that works for you. It might seem difficult because many different brands, models, specs, and prices exist.

If you have trouble narrowing down your options, Im here to help. These are the best 420mm AIO CPU coolers for 2018. Check them out for yourself and see which one works best for you.


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Matt Wilson
By Matt Wilson

Matt Wilson is a PC gaming and hardware expert with years of experience. He's a trusted tech product reviewer for gamers and tech enthusiasts.


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