The 10 Best CPU Liquid Coolers

Updated April 13, 2018 by Christopher Thomas

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We spent 45 hours on research, videography, and editing, to review the top choices for this wiki. Overclocking can really make the most of a system, but it can also cause overheating, leading to compromised performance and potential damage. These closed-loop liquid coolers utilize fluid thermodynamics to move excess heat away from the CPU, helping maintain safe operating temperatures no matter how far you've pushed your processor. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best cpu liquid cooler on Amazon.

10. UpHere All-In-One

9. Silverstone Tundra

8. Lepa AquaChanger

7. EVGA CLC 120

6. Arctic Liquid Freezer

5. EnerMax LiqTech

4. Corsair Hydro

3. Thermaltake 3.0

2. DeepCool Captain

1. NZXT Kraken X62

Letting Your Computer Keep Its Cool

If you're a programmer, engineer, graphic artist, or any computer professional who requires fast and powerful processors, you're likely to hear the sound of a whirring fan from within your machine. In many desktop and laptop situations, an internal fan is usually good enough to prevent overheating and to keep your computer's components cool with heavy use. However, if you use a lot of fancy hardware and you believe in constant upgrades to allow the machine to run faster than it did before, then you will need additional power to maintain those components and keep them cool. This extra power may generate more heat than your fans can handle on their own. In such situations, liquid cooling solutions will come in handy.

The process of computer cooling is defined as the removal of wasted heat produced by the machine's internal components in order to maintain their optimal operating temperatures. Those components most susceptible to overheating include the computer's central processing unit, graphics cards, and hard disk drives.

A computer's heat comes from its microchips and transistors. A microchip is a set of interconnected electronic components imprinted onto a small chip made from semiconducting material (e.g. silicon). These interconnected electronic components are sometimes referred to as integrated circuits. A transistor is an electrical switch that is either on or off at a given time. As transistors change their status, electricity is moved around the microchip. The more transistors a microchip has, and the faster they change their state, the hotter the microchip becomes. This is where the liquid cooling concept becomes important.

Water has a high degree of thermal conductivity, meaning that it can move heat faster than air can. Water also has a high specific heat capacity, meaning that it can absorb more heat than air does before it starts to feel hot. For that reason, if you have a powerful computer with components that produce more heat than the air around them is capable of absorbing, a liquid CPU cooler will be more effective at preventing overheats. Liquid cooling will also allow your machine to run quieter than it would using traditional fan technology.

Heat Up Your Search For Cooling Down

Also referred to as water cooling, liquid cooling for a computer works in a similar fashion to how a car's cooling system works. Although a car's heat is generated by the burning of fuel (internal combustion) and a computer's heat comes from its microchips and transistors, both leverage the process of thermodynamics whereby heat moves from warmer locations to cooler ones.

A car's cooling system, for example, circulates water from the engine to the radiator. As the water approaches the radiator, that water's heat is drawn away, causing it to cool off as it heads back toward the engine. At the same time, the car's internal fan circulates air around the heated radiator. This air becomes warmer due to the radiator having expelled some of its own heat, ultimately cooling the radiator.

The components of a computer's liquid cooling system include a pump for moving coolant to the CPU, a radiator for dispelling heat, a fan for moving air over the radiator, a coolant reservoir that holds extra water, and a series of hoses that connect these parts together. The computer also uses a water block to cool the microchips. A water block is made of a heat-conductive metal (e.g. copper) and is filled with hollow tubes. Its flat metal bottom sits directly on top of the chip being cooled. Thermal paste (also known as thermal grease) is often sandwiched between the microchip and water block in order to improve heat transfer between both surfaces.

If the idea of searching for individual components for a liquid cooler doesn't appeal to you, ready-to-use cooling kits are certainly available on the market as well. These self-contained coolers will plug into your computer's expansion slots or power supply to provide cooling to a specific type of microchip. The kits also come with instructions for assembly. One may also be able to find companies that sell high-powered PCs with liquid cooling functionality already integrated into their systems.

Quiet operation is another key feature to look for in a CPU liquid cooling system, since the main point of the investment is to allow your computer to run more efficiently and quieter than it would with the use of its internal fans alone.

Some coolers also have variable speed settings for their pumps, which can be useful as the degree of processing power for a given task can fluctuate over time.

A Brief History Of CPU Liquid Coolers

The process of cooling hot computer components dates as far back as the early 1980s with the use of Fluorinert to cool the Cray-2 supercomputer. The popularity of water cooling powerful computer systems increased throughout the 1990s with most coolers being homemade during that decade. Many were constructed with car radiators, aquarium pumps, homemade water blocks, PVC and silicone tubing, and reservoirs using plastic bottles. It wasn't until Advanced Micro Devices released its Athlon processor in 2,000 that home-based liquid coolers became prevalent.

By 2011, custom computer retailers were manufacturing water-cooling components compact enough to fit inside most computer cases. The Apple Power Mac G5 was the first mainstream desktop computer to offer fully-integrated water cooling as a standard. This was quickly followed by Dell with their XPS machines leveraging thermoelectric cooling principles. As the CPU has become more powerful over time, the popularity of liquid cooling has continued to grow, though it is still a relatively small market.


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Last updated on April 13, 2018 by Christopher Thomas

A traveling chef, musician, and student of the English language, Chris can be found promoting facts and perfect copy around the globe, from dense urban centers to remote mountaintops. In his free time he revels in dispelling pseudoscience, while at night he dreams of modern technology, world peace, and the Oxford comma.


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