AIO Vs Custom Loop — Which Is Better?

AIOs and Custom loops are both liquid cooling systems that help cool down your processor. They use a coolant to transfer heat away from the CPU to the radiator, where it cools down with the help of fans before circulating to the CPU again.

While they both work with the same principle and offer high cooling efficiency, they come with certain differences. Serious high-end PC builders opt for custom loop setups, but it doesn’t mean that such coolers are better in every way.

Custom loops have higher cooling capability, produce less noise and look more pleasing to the eyes. On the other end of the spectrum, AIO coolers are much cheaper as well as easier to install and maintain.

What are AIO Liquid Coolers?

All-in-One (AIO) Liquid Coolers are pre-manufactured liquid cooling loops that you can directly install on your PC

It comes with an integrated pump and a CPU water block, a radiator and two soft tubes that connect the pump to the radiator. The CPU block absorbs heat from the CPU and circulates the heated liquid through one of the tubes to the radiator.

The radiator uses its channels to disperse the fluid over a large surface so that the fan can cool it down. The cooled liquid is then sent back to the pump through another tube.

What are Custom Loop Liquid Coolers?

As the name suggests, a custom loop is a liquid cooling loop that you set up yourself. You pick all the parts individually and fit them as per your setup.

The main components of the custom loop include:

  • Coolant or cooling liquid, which is the main cooling material.
  • Water blocks, which act as an interface between the liquid and the PC components like the CPU.
  • Tubes in which the liquid circulates throughout the PC. You can use soft or hard tubes, but it’s generally better to use hard tubes as the soft ones will deplete the coolant over time due to micro-evaporation.
  • Fittings to connect the tubes with each other as well as other elements on the loop.
  • Reservoir that holds the majority of the coolant.
  • Pump that sends the coolant from the reservoir to the PC components and back to the reservoir.
  • Radiators along with fans to disperse the heat away from the PC.
  • Cables to power up and control the pump and the radiator fans as well as any RGB lighting.

You need to research all the components carefully along with your PC case and motherboard layout to design and install a proper cooling system for your setup.

Differences Between AIO and Custom Loop Liquid Coolers

Now that you know what both these coolers are as well as how they work, let’s get into the individual differences.

CPU Cooling Efficiency

Custom loops use a larger volume of liquid coolant than AIO coolers. So it has a larger volume to spread over all the heat from the CPU. This additional headroom for dissipating heat makes these coolers significantly more efficient.

You can also use multiple radiators with the custom loops to cool down the heated liquid much faster, which further enhances its performance. AIOs have a small volume of liquid and only come with one radiator, so it is not as efficient.

Cooling GPU and Other Components

While some AIO coolers target the graphics card as well, they are not as common. You will also need more clearance for installing GPU and CPU AIO coolers as they usually don’t come as an integrated unit.

On the other hand, you can customize water loops to have water blocks for both CPU and GPU in the same loop. So there’s not much concern for case clearance. 

Some higher end manufacturers for custom loop solutions also provide cooling components for the motherboard VRMs, RAMs and SSDs as well.

Modularity and Clearance

Unlike AIO coolers, you need to hand-pick each and every component of a custom loop while installing it. This gives you the freedom to design the cooler per your need. 

You can fit the tubes and all other components based on your motherboard and case layout. Such modularity also allows you to replace just a single component instead of the whole cooler if it fails.

AIOs do not come with such functionalities, so you really need to be careful while choosing them so that they are compatible with your PC case.


Mounting AIOs can be comparable to or sometimes easier compared to air coolers, custom loops take it to a whole new level. 

For AIOs, you simply need to install the radiator and the fans on the case and then mount the pump over the CPU. You do have to take care of a few things like the orientation and intake/exhaust, but a first time PC builder can set it up as long as they are careful.

For custom loops though, it’s not so simple. You need to get compatible water blocks for your CPU and GPU. You also have to carefully bend and cut the tubes, connect them with each other and other components securely using the fittings.


In the early stages of liquid cooling popularity, there were concerns about coolant leaks in both AIOs and custom loops. However, advancements in manufacturing and design have significantly reduced these risks in more recent products.

If you set up your cooling system properly, leaks are not that much of a concern for both these cooling systems nowadays.

However, many things can go wrong while installing a custom loop, so it is comparatively more susceptible to safety hazards. AIOs, especially the latest ones, are extremely safe, so their risk of leaking is very limited.


Noise in liquid coolers primarily originates from the pump and the radiator fans. Typically, custom loop components are designed for lower noise levels, making them often quieter than their AIO counterparts.

You can buy pumps that are built for noise reduction to build custom loops. On the other hand, most AIOs don’t come with such pumps.

Also, since custom loops are more efficient at cooling, they can use a lower speed for the radiator fans. You can even install multiple radiators and limit their fan speed even further to lower the noise.

If you include GPU cooling in the custom loop, you eliminate the need of GPU fans as well. So your overall setup will become very quiet.


If you are concerned with the aesthetics of your cooling system, a custom loop wins hands down in this competition. AIOs with RGB radiator fans and a LCD/RGB pump can look attractive, but that’s basically it.

Custom loops can have all of these and more. It is possible to use coolants with different colors, and with illuminating effects on such coolers. So with tubes running all around, these coolers can look extremely striking.


The modularity and cooling efficiency of custom loops comes with a direct downside, their price tag. Since you will need more components and will be hand picking each of them, the more efficient the cooling system you want to build, the higher the cost.

Typically, a basic custom loop setup may have a higher initial cost than many high-end AIOs. If you’re working within a specific budget, AIOs often provide a more cost-effective cooling solution.

Maintenance and Lifespan

AIOs come as closed loop systems and don’t require much maintenance. You only need to clean the radiator and fans occasionally. Custom loops however, require periodic maintenance and observation.

You need to make sure all the components, especially the coolant, are clean and in working condition. The coolant will start showing biological growth (bacteria or algae-like) and discoloration over time, which also reduces its cooling capacity. So you need to drain, clean and replace it once or twice every year.

A custom loop’s lifespan also depends on how well you take care of it. Without much maintenance, it can last for 1-3 years. However, as long as you keep cleaning and replacing the liquid, you will be able to use it for much longer. You can replace any faulty component to extend its lifespan even more.  

While the typical lifespan of an AIO is around 5-7 years, factors like liquid depletion and potential pump failure can influence its longevity. Given that AIOs are designed as closed systems, they aren’t intended for user-driven draining and refilling of the coolant. Consequently, their lifespan is generally fixed with limited options for extension.

Which One Should I Choose?

After learning all the differences between these two, you should already have a general idea on what you want for your rig. To summarize,

  • If you are building a high-end PC, it’s better to use a custom loop for the best cooling efficiency and other benefits. You should also be able to overclock your CPU/GPU to much higher speeds with such a cooling system.
  • If you don’t want to go through the hassle of installing and maintaining the custom loop, you can install an AIO cooler for high-end PCs as well. However, keep in mind that you won’t be able to use your computer to its best potential.
  • For most low-end PC builds, AIO coolers should provide enough cooling power. So, it’s better to go with these instead. 
  • For a mid-range PC, if your budget allows it, you can use a custom loop. But using AIO might also be fine, especially if you do not want to cool the GPU using the loop.

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