CPU Cooling Guide: Air vs AIO vs Custom Loops for Modern Processors

CPU coolers, whether Air based, AIO, or custom loops, ensure that the performance of modern processors remains at its peak even when running at full load. CPU load increases when we start a game or run multiple applications at once. With the load billions of transistors start to conduct electricity which in return increases its core temperature. CPU coolers remove the heat and ensure that the CPU material does not reach its thermal throttling temperature.

The method by which the heat is removed depends on the type of cooler: Air, AIO or Custom Loops. Each of them offers specific advantages which we will discuss in this article. There are also design limitations with each cooler that are worth considering before purchasing a PC. In this CPU cooling guide, we will analyze all three methods of cooling modern processors so that you can find the right solution for your PC build. But before we get into the details, let's cover the basic terms that are relevant to CPU cooling.

Covering Key Terminologies

● TDP: Thermal design power is the heat that the processor generates when it is under load. It is the same heat that CPU coolers need to remove for efficient and safe operation.

● Thermal Throttling: When the CPU cooler is unable to remove the heat efficiently and the CPU temperature rises above a threshold, it starts to thermal throttle. It means that it will reduce its operational speed to cope with rising temperature degrading your PC performance.

● Static Pressure: The fans when operating create a pressure difference across them. Higher static pressure means that it can pull air from complex tightly packed aluminum or copper fins of a cooler.

● PWM: Pulse width modulation is a controlling technique through which fan or pump speed is changed. The power is sent in pulses using a 4-pin configuration.

● IHS: Integrated heat spreader is the metal lid that is mounted on top of the CPU die protecting the fragile silicon chip underneath.

● Ambient Temperature: The room air temperature where the PC build is placed.

CPU Air Cooler

Working Mechanism

These are the legacy designs that have been followed since the invention of computers. It uses metal heat fins that conduct heat from the processor and spread it across large metal fins also called heatsink. A fan then pushes cool ambient air onto the heat fins carrying away the heat. There are three major factors that impact its cooling performance:

• Fin Surface Area
• Air Flow From the Fan
• Material Composition/Design of Cooler

Modern Air Cooler Design

Modern air coolers go one step ahead and use a two phase thermodynamic cycle. The base plate that comes in contact with the CPU's IHS. Inside a small amount of liquid is present that absorbs the heat and converts into vapor phase. There are heat pipes that carry the vapor from the base plate to the fins that are being cooled. After cooling it turns to liquid again and comes back to the base plate. 

Advantages

• Supreme Reliability (A Failed Fan Is Cheap And Easy To Replace)
• Zero Risk Of Catastrophic System Leaks
• Lifespan Measured In Decades

Disadvantages

• Heavy Mechanical Strain On The Motherboard Socket
• Restricted Physical Access To Ram Slots
• Hard Ceiling On Transient Heat Load Absorption

CPU AIO Solution or Liquid Coolers

Working Mechanism

All-in-one solutions or liquid coolers are the most popular choice in modern premium PC builds. They come in DIY configuration that is easy to install. It is not just market gimmicks. The liquid cooler practically solves the limitation issue with air coolers. Instead of a two phase flow it uses a single liquid phase to transfer heat. 

There are liquid pumps that force flow over the base plate that comes in contact with IHS. The liquid heats up, cooling the processor. Then it is pumped through tubes to the radiator. The radiator has a highly dense set of fins with massive surface area. Incoming liquid is cooled inside the tubes via the high static pressure fans that push cool ambient air over them. One of the biggest advantages of using liquid is its ability to absorb transient heat spikes (high thermal mass) without speeding up the fan.

Factors Impacting Liquid Cooler Performance

• Radiator Size (120mm, 240mm, 360mm, and 420mm)
• Liquid Pump Speed
• Radiator Fan Flowrate and Static Pressure
• Radiator and Baseplate Material Choice (Copper or Aluminum) 

Advantages

• High Thermal Mass
• Excellent Motherboard Clearance
• Superior Sustained Thermal Limits

Disadvantages

• Fixed Lifespan Due To Permeation
• Risk Of Pump Failure
• Non-Zero Risk of Leaks

Custom Loop Liquid Coolers 

Working Mechanism

The working mechanism of a custom loop cooler is the same as any other liquid cooler. However, there is an addition of a reservoir that accommodates the volumetric changes caused by change in liquid temperature. The closed loop may leak in case there is no space for liquid to expand or contract. Unlike the AIO coolers these loops use non-flexible tubing. They are not limited to CPU cooling. Advanced users can connect them to GPU, SSD or any other hardware that requires cooling. However, it requires careful handling as the liquid leakage can damage the hardware. 

Owing to their highly customizable design they are often the most suitable option for expert PC builders. Users can find the exact suitable arrangement that suits their PC configuration. They can achieve TDP as high as 600W to 1000W+ with no theoretical limits. 

Factors Impacting Custom Loop Liquid Cooler Performance

• Reservoir Size for Thermal Spike Absorption
• Pump Flowrate
• Type of Pump (D5 and DDC)
• Radiator Surface Area and Density
• Coolant Composition
• Water Block Internal Geometry 

Advantages

• Absolute Maximum Thermal Performance
• Near-Silent Operation Even Under Extreme Loads
• The Ability To Cool Both The CPU And GPU In A Single Loop
• Unmatched Visual Customization

Disadvantages

• Exorbitant Upfront Cost
• A Steep Building Learning Curve
• Requires Rigorous Annual Maintenance (Flushing Coolant, Cleaning Micro-Fins)
• Carries A High Risk Of Catastrophic Leaks

Head to Head Comparison between Air, AIO, and Custom Loop CPU Coolers

Here is an image providing a comparative analysis of the three methods of CPU cooling used for 200W CPU TDP and a 25C ambient temperature. The comparison reveals the price difference of the three methods of CPU cooling and the associated operating temperatures.

Conclusion

Whether you pick the CPU air, AIO or Custom loop cooler every choice comes with its pros and cons. The choice depends on limited volume in PC case, assembling capability, overall budget, tolerance for system noise, and the peak thermal output of your specific processor.

• Air coolers maintain the highest reliability. Dual-tower air coolers are the best choice for a decade-long, leak-free solution.
• AIO liquid coolers suit most modern high-performance designs. They provide higher thermal mass to absorb transient spikes and sustain cooling without plumbing expertise.
• Custom loops are thermal engineering's apex. For the enthusiast who sticks to a rigorous maintenance plan they provide optimum thermal headroom and custom looks.

Matching your cooling architecture to your processor's TDP means no thermal throttling and optimized compute speeds and device longevity. However, you need a well built product from a reputable brand like ESGAMING to get the right results. Designed for the next generation, ESGAMING empowers young PC builders worldwide to level up their desktop vibe without limits. ESGAMING is currently expanding global brand agent partnership channels, providing standardized brand support, complete product matrices, and professional market services for global partners.

For more information, visit www.esgamingpc.com