What Is Size? A Guide for Aio Liquid Coolers Buyers (2026)

Understanding AIO Cooler Size Specs

When you browse for liquid cooling, the most critical specification is size. This number tells you the physical footprint of the radiator. It determines whether the unit fits in your case and how much heat it can move. You will see values like 120mm, 240mm, and 360mm on product listings. These numbers are not random. They refer to the length of the radiator block in millimeters.

A 120mm radiator has a single fan slot. It is compact and ideal for small form factor cases. A 240mm radiator spans two fan slots. This is the most common choice for mid-tower cases. It offers a balance between space and cooling performance. A 360mm radiator covers three fan slots. It provides maximum surface area for heat exchange. You need a spacious case to accommodate this larger size.

The width of the radiator is usually standard, around 25 to 30 millimeters. The height includes the fans. You must measure the clearance inside your case chassis. If you install a 240mm unit, ensure there is room for two fans side by side. Some cases support mounting radiators on the top or front. Always check the mounting orientation before buying.

Why does this matter to you? Larger radiators generally cool better. More surface area allows the liquid to dissipate heat more efficiently. This keeps your CPU temperatures lower under heavy loads. However, bigger sizes require more space. You might sacrifice drive bays or other components. Smaller sizes save space but may struggle with high-end processors.

Understanding size explained helps you make a practical choice. Match the radiator length to your case capacity. Do not guess. Measure the available space. Ensure the fans do not obstruct other parts. This simple check prevents installation headaches. It ensures your system runs cool and quiet. Focus on the physical dimensions first. Then consider pump performance and fan quality. The size is the foundation of your cooling setup.

Comparing AIO Radiator Sizes

120Mm

A 120mm radiator uses a single fan. It is the smallest common size for AIO coolers. This option fits in small cases or tight spaces where larger units will not install. You get minimal cooling capacity. This size is best for low-power CPUs or systems that prioritize compactness over raw performance. The Thermaltake TH120 ARGB Snow Edition is an example of this form factor. It offers white ARGB lighting and supports modern sockets like AM5 and LGA 1700. However, it lacks the thermal headroom of larger radiators. If your case only has one 120mm fan mount, this is your only AIO choice. You must accept higher temperatures under heavy loads.

240Mm

A 240mm radiator typically uses two fans side-by-side. It is the standard size for mid-tower gaming builds. This size balances cooling performance with case compatibility. Most mid-tower cases support two 120mm or two 140mm fan mounts. You get significantly better heat dissipation than a 120mm unit. The Cooler Master MasterLiquid ML240L RGB V2 and Thermalright Frozen Notte 240 Black ARGB both use this size. They support popular sockets like AM4, AM5, and LGA 1700. This size suits users who want reliable performance without needing a massive case. It is a practical choice for most gamers. You gain more cooling surface area while keeping the build manageable. It fits well in standard ATX cases with front or top mounting options.

360Mm

A 360mm radiator uses three fans. It provides the highest cooling capacity among standard AIO sizes. This size is ideal for high-performance CPUs and power users. You need a case with space for three fans, usually in the front or top. The Be Quiet! Pure Loop 2 FX 360mm ARGB Cooler and Thermalright Frozen Notte 360 Black ARGB V2 are examples. They offer robust cooling for demanding processors. This size suits builders with spacious cases who prioritize low temperatures. The trade-off is increased size and weight. You must ensure your case can physically accommodate the extra length. It is the best choice for overclocking or sustained heavy workloads. You get maximum heat transfer capability.

240mm Radiator

This label confirms the physical dimension of the cooling block array. It indicates a dual-fan setup. The ID-COOLING Frostflow 240mm White LED Cooler uses this specification. It offers straightforward cooling for Intel and AMD systems. The white aesthetic suits monochrome builds. You get standard 240mm performance. This size is compatible with many mid-tower cases. It provides a clean look without complex lighting customization. The Frostflow model focuses on a clean white design. It is suitable for builders who prioritize aesthetics and standard cooling needs. You do not need advanced software control for basic operation. It fits well in cases with standard 240mm radiator mounts. This is a reliable option for general use.

Is 240mm AIO Worth It

Who needs it

You should prioritize a 240mm AIO if your case supports dual-fan mounts. This size offers a significant jump in cooling performance over 120mm units. The larger 360mm surface area allows the liquid to dissipate heat more effectively. You will notice lower temperatures under heavy loads. This makes it ideal for modern CPUs that generate substantial thermal output. It strikes a balance between capacity and physical footprint. If you plan to run intensive tasks like video editing or gaming, this extra surface area matters. It prevents thermal throttling more reliably than smaller radiators. Check your case compatibility first. Many mid-tower cases have room for two 120mm fans at the front or top. This size is the sweet spot for most enthusiasts who want better cooling without sacrificing too much interior space.

Who can skip it

You can skip the 240mm size if your case only fits a single fan. The 120mm radiator is your only option in small form factor builds. It is also unnecessary if you have a high-airflow case with a large 360mm mount available. The 360mm unit provides superior cooling for extreme workloads. Do not choose 240mm if you prioritize maximum performance above all else. The 360mm radiator moves more heat. It is better for overclocking or professional rendering. Stick with 120mm if space is extremely tight. Do not force a 240mm into a case that cannot accommodate it. Check clearance for the pump head and tubing. Prioritize fitment and airflow over radiator size if you are building in a compact chassis. Larger radiators require more space and may interfere with other components.

Key AIO Specs Glossary

Socket Compatibility

The list of CPU mounts a cooler supports. Ensure the package includes brackets for your specific processor platform, such as Intel LGA1700 or AMD AM5, before purchasing.

Radiator Size

The physical dimensions of the heat exchanger, like 120mm or 240mm. This measurement dictates fan count and total cooling surface area available for heat dissipation.

Fan Pitch

The distance between fan centers, typically 120mm or 140mm. This spacing determines which radiator thicknesses fit your case and how densely fans pack heat removal.

Tubing Length

The distance from the pump block to the radiator. Longer tubes offer routing flexibility for large cases, while shorter ones suit compact builds with tight clearances.

Pump Speed

The rotation rate of the internal pump, measured in RPM. Higher speeds move fluid faster for better cooling but often increase audible noise levels during operation.

RGB Lighting

LEDs that allow color customization via motherboard software. This feature adds visual flair to your build but consumes minimal power and does not affect thermal performance.

LCD Display

A small screen on the pump block showing system stats. These displays provide real-time data like CPU temperature or fan speed, adding a high-tech aesthetic to your setup.

Material Build

The construction of the radiator fins and tubes. Copper offers superior heat conductivity, while aluminum is lighter. Sleeved tubing prevents kinks and improves cable management aesthetics.

Quick picks

Our 6 picks

1

Be Quiet Pure Loop 2 FX 360mm ARGB Cooler

Best for: Quiet operation and broad socket compatibility

Size

360Mm (what this guide is about)

Radiator Size

360mm

Socket Compatibility

AM5, AM4, 1700, 1200, 2066, 1150, 1151

Lighting Type

ARGB

Dimensions

15.6 × 4.72 × 2.05 inches

Weight

5.73 pounds

View on Amazon: Be Quiet Pure Loop 2 FX 360mm ARGB Cooler Affiliate link

This 360mm AIO cooler uses three 120mm Light Wings fans for high air pressure and ARGB lighting. The pump is doubly decoupled to reduce vibration and noise. It supports Intel LGA1700 and AMD AM5 sockets. The included hub syncs up to six ARGB components. It suits builders needing broad socket compatibility and quiet operation.

Pros

• 360mm radiator size for high heat dissipation
• Doubly decoupled PWM pump for quiet operation
• Supports Intel LGA1700 and AMD AM5 sockets
• ARGB-PWM-Hub syncs up to six components

Cons

• Heavy at 5.73 pounds
• No mention of software control for fan curves
• Limited to ARGB lighting without RGBW support

Good fit if

• You need broad socket support for Intel or AMD
• You prioritize quiet pump operation
• You have a case that fits a 360mm radiator

Skip if

• You require software-based fan curve control
• You have a compact case with limited radiator space
• You prefer a lighter cooling solution

Verdict: be quiet! Pure Loop 2 FX 360mm is a solid choice for users who need quiet operation and broad socket compatibility. It fits well in cases that can accommodate its size and weight.

2

Cooler Master MasterLiquid ML240L RGB V2

Best for: Mid-tower builds needing 240mm RGB cooling

Size

240mm Radiator (what this guide is about)

Radiator Size

240mm

Socket Compatibility

AMD Ryzen AM5/AM4, Intel LGA1700/1200

Lighting Type

RGB

Length

0.43 inches

Width

0.19 inches

View on Amazon: Cooler Master MasterLiquid ML240L RGB V2 Affiliate link

The Cooler Master ML240L RGB V2 is a 240mm AIO liquid cooler designed for systems requiring balanced cooling and visual customization. It features a third-generation dual chamber pump for improved efficiency and SickleFlow fans for quiet airflow. The unit supports AMD AM4/AM5 and Intel LGA1700/1200 sockets. Its industrial-grade EPDM seal aims to enhance longevity. This model suits users who want reliable performance with customizable RGB lighting in a standard 240mm form factor.

Pros

• Third-generation dual chamber pump design
• Supports AMD AM4, AM5, and Intel LGA1700 sockets
• Customizable RGB lighting effects
• SickleFlow fans for quiet airflow performance
• Industrial-grade EPDM seal for leak protection

Cons

• Only 240mm radiator size
• No mention of software control for lighting
• No mention of pump speed adjustment

Good fit if

• You need a 240mm radiator for mid-tower cases
• You want support for modern Intel and AMD sockets
• You prefer customizable RGB lighting

Skip if

• You require a 360mm radiator for high-end CPUs
• You need software-based fan curve control
• You want a non-RGB silent build

Verdict: Cooler Master ML240L RGB V2 offers solid 240mm cooling with a dual chamber pump and modern socket support. It fits users who need reliable performance and RGB lighting without requiring advanced software control.

3

Thermalright Frozen Notte 240 Black ARGB

Best for: Standard gaming builds with 240mm case support

Size

240Mm (what this guide is about)

Radiator Size

240mm

Socket Compatibility

AM4, AM5, LGA 1700, LGA 1851

Pump Speed

5300 RPM

Fan Speed

2000 RPM

Lighting Type

ARGB

View on Amazon: Thermalright Frozen Notte 240 Black ARGB Affiliate link

The Thermalright Frozen Notte 240 Black ARGB V2 is a 240mm AIO cooler designed for Intel and AMD platforms. It features a copper base water block with a pump speed up to 5300 RPM. The unit includes two 120mm fans running at 2000 RPM. It supports 5V 3-pin ARGB synchronization. This cooler suits users seeking reliable cooling performance with integrated lighting effects.

Pros

• 240mm radiator size fits most mid-tower cases
• Pump speed reaches 5300 RPM for efficient heat transfer
• Fans provide 72.37 CFM air volume with low noise
• Full copper mirror plane base for better cooling
• Supports ARGB synchronization via 5V 3-pin motherboard header

Cons

• Fan noise level reaches 27.7 dBA at maximum speed
• Limited to 5V 3-pin ARGB, not compatible with 12V 4-pin headers
• No software control for fan curves or lighting mentioned

Good fit if

• You need a 240mm radiator for your case
• You want ARGB lighting synced with your motherboard
• You use Intel LGA 1700 or AMD AM5 sockets

Skip if

• You require a 360mm radiator for extreme overclocking
• Your motherboard only supports 12V 4-pin ARGB
• You need silent operation below 20 dBA

Verdict: Thermalright Frozen Notte 240 Black ARGB delivers solid cooling performance for standard builds. It fits users who prioritize 240mm radiator compatibility and motherboard-synced lighting over extreme silence.

4

Thermaltake TH120 ARGB Snow Edition 120mm

Best for: Small cases needing white ARGB cooling

Size

120Mm (what this guide is about)

Radiator Size

120mm

Socket Compatibility

Intel LGA1700 Ready/AMD AM5

Lighting Type

ARGB

Dimensions

10.5 × 8.47 × 5.39 inches

Weight

1.65 pounds

View on Amazon: Thermaltake TH120 ARGB Snow Edition 120mm Affiliate link

This 120mm AIO cooler features a low-profile pump design and copper base plate for efficient heat transfer. It includes ARGB fans and a pump ring that sync with major motherboard RGB software or use the included controller. The white Snow Edition fits Intel LGA1700 and AMD AM5 sockets. Its compact size suits small cases where larger radiators do not fit.

Pros

• 120mm radiator size fits small form factor cases
• ARGB lighting syncs with ASUS, Gigabyte, MSI, and ASRock motherboards
• Low-profile pump design reduces clearance issues
• Copper base plate accelerates heat conductivity

Cons

• 120mm radiator offers less cooling capacity than 240mm or 360mm options
• Includes ARGB controller instead of direct motherboard header connection
• No LCD display on the pump head

Good fit if

• You need a white cooler for a compact ITX or mATX build
• You want ARGB lighting that syncs with your motherboard
• You are using an Intel LGA1700 or AMD AM5 CPU

Skip if

• You require maximum cooling performance for high-end CPUs
• You prefer a larger 240mm or 360mm radiator for better thermals
• You want an LCD screen on the pump for custom messages

Verdict: Thermaltake TH120 ARGB Snow 120mm is a compact white cooler for builders with small cases who need ARGB sync. It fits LGA1700 and AM5 systems but lacks the cooling headroom of larger radiators.

5

Thermalright Frozen Notte 360 Black ARGB V2

Best for: High-performance cooling in spacious cases

Size

360Mm (what this guide is about)

Radiator Size

360mm

Socket Compatibility

AM4, AM5, LGA 1700, LGA 1851

Pump Speed

5300 RPM

Fan Speed

2000 RPM

Lighting Type

ARGB

View on Amazon: Thermalright Frozen Notte 360 Black ARGB V2 Affiliate link

This 360mm AIO cooler uses a 397mm radiator and three 120mm fans to manage heat. The pump runs at 5300 RPM, while the fans reach 2000 RPM with 2.87 mmH2O static pressure. It supports ARGB lighting via a 5V 3-pin header and fits Intel LGA 1700/1851 and AMD AM5 sockets. You need a case with at least 250mm clearance for installation.

Pros

• 360mm radiator with 397mm length for high heat dissipation
• Pump speed of 5300 RPM for efficient coolant circulation
• Fans deliver 2.87 mmH2O static pressure and 72.37 CFM airflow
• S-FDB bearings reduce noise and vibration during operation
• ARGB lighting synchronizes with 5V 3-pin motherboard headers

Cons

• Requires 250mm case width clearance, limiting fit in smaller chassis
• Pump uses a 3-pin 12V connector, which may not offer speed control on all boards
• Lighting relies on 5V 3-pin ARGB, not compatible with 12V 4-pin RGB systems

Good fit if

• You have a mid-tower or full-tower case with sufficient radiator clearance
• You want strong cooling performance for high-end Intel or AMD CPUs
• You prefer black aesthetics with synchronized ARGB lighting effects

Skip if

• You are building in a compact case with less than 250mm width
• Your motherboard only supports 12V 4-pin RGB and lacks 5V ARGB headers
• You need a smaller 240mm or 120mm radiator solution

Verdict: Thermalright Frozen Notte 360 Black ARGB V2 delivers robust cooling for power users with compatible hardware. It suits builders with spacious cases who need high airflow and pump speed for demanding processors.

6

ID-COOLING Frostflow 240mm White LED Cooler

Best for: White-themed PC builds with standard cooling needs

Size

240mm Radiator (what this guide is about)

Radiator Size

240mm

Socket Compatibility

Intel LGA1700/1200/115X, AMD AM5/AM4

Lighting Type

White LED

Dimensions

4.72 × 0.98 × 4.72 inches

Weight

2 pounds

View on Amazon: ID-COOLING Frostflow 240mm White LED Cooler Affiliate link

This 240mm AIO cooler features a dual 120mm PWM fan setup for efficient heat transfer. The pump block and fans include classic white LED lighting to match white PC builds. It supports Intel LGA1700, 115x, and 2066 sockets, as well as AMD AM4 and AM5. The unit weighs two pounds and fits standard mid-tower cases. You get reliable cooling performance with a clean aesthetic.

Pros

• 240mm radiator with two 120mm PWM fans
• White LED lighting on pump and fans
• Supports Intel LGA1700 and AMD AM5 sockets

Cons

• Fixed white LED lighting without RGB customization
• No software control for fan speeds or lighting
• Basic pump design lacks advanced monitoring sensors

Good fit if

• You are building a white-themed PC case
• You need support for Intel LGA1700 or AMD AM5
• You want a simple 240mm radiator solution

Skip if

• You require customizable RGB lighting effects
• You need software control for fan curves
• You prefer a 360mm radiator for higher heat loads

Verdict: ID-COOLING FROSTFLOW X 240 Snow offers straightforward cooling for Intel and AMD systems with a clean white aesthetic. It suits builders who prioritize a monochrome look over lighting customization.

Specifications side by side

Frequently asked questions

See also

• size explained
• size explained