Thermalright 53mm Low Profile ITX CPU Cooler vs Thermalright Assassin X120 120mm Air (2026): Key Differences
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We compare the thermalright axp90 x53 low profile itx vs assassin x120 refined se to help you pick the right air cooler. Both units use four copper heat pipes and AGHP technology for consistent heat transfer. They also share broad socket support for modern Intel and AMD platforms. The main difference is physical size. One is a low-profile design for small cases, while the other is a standard tower cooler for larger chassis. Your case height will dictate which option works.
Key differences
| Aspect | Thermalright 53mm Low Profile ITX CPU Cooler | Thermalright Assassin X120 120mm Air Cooler |
|---|---|---|
| Cooler Height | 53mm | 148mm |
| Fan Size | 92mm | 120mm |
| Max Fan Speed | 2700 RPM | 1550 RPM |
| Max Airflow | 42.58 CFM | 66.17 CFM |
| System Type | ITX | not listed |
| Weight | 1.1 pounds | 1.42 pounds |
Which one should you choose?
Choose Thermalright 53mm Low Profile ITX CPU Cooler if
- You need a cooler under 60mm for a small ITX case.
- Your RAM modules are tall and block standard towers.
- You prefer a smaller fan that spins faster.
Choose Thermalright Assassin X120 120mm Air Cooler if
- You have a standard ATX or mATX case with room.
- You want higher static pressure and airflow.
- You prefer a larger 120mm fan for smoother operation.
Verdict: The AXP90-X53 is the only choice for tight ITX builds where height is limited. The Assassin X120 Refined SE offers more cooling potential for standard cases with its larger fan and tower. Pick the one that fits your chassis dimensions.
ITX Fit vs Standard Tower
System type
The Thermalright AXP90-X53 is built specifically for ITX systems. Its compact form factor allows installation in small form factor chassis where space is extremely limited. The Assassin X120 Refined SE is designed for standard mid-tower cases. It requires more vertical clearance and depth. If you are building a mini-ITX PC, the AXP90-X53 is the only viable option. The Assassin X120 fits standard ATX cases but will not fit in small ITX boxes. Choose the AXP90-X53 for compact builds. Choose the Assassin X120 for standard desktop towers.
Cooler height
Height differences are significant between these two coolers. The AXP90-X53 stands at just 53mm tall. This low profile ensures it fits under low-height RAM sticks. The Assassin X120 Refined SE is much taller at 148mm. This height provides a larger surface area for heat dissipation but limits RAM clearance. If your motherboard has tall memory modules, the AXP90-X53 will not interfere. The Assassin X120 may block RAM slots depending on your specific memory height. You must check your RAM height against the 148mm limit for the Assassin X120.
Fan size
Fan size affects airflow and noise characteristics. The AXP90-X53 uses a 92mm fan. This smaller fan spins at a maximum of 2700 RPM to move 42.58 CFM of air. The Assassin X120 Refined SE uses a larger 120mm fan. This larger fan moves 66.17 CFM at a lower speed of 1550 RPM. The larger fan generally offers better airflow at lower noise levels. The smaller fan in the AXP90-X53 must spin faster to achieve similar cooling, which may increase noise. The Assassin X120 has an advantage in airflow capacity due to its larger fan size.
Tower design
Tower design impacts compatibility and cooling efficiency. The AXP90-X53 features a low profile tower design. It is shorter and wider, optimizing for small cases. The Assassin X120 Refined SE uses a standard tower design. It is taller and narrower. This standard design allows for better airflow over the heat pipes in open cases. The low profile design of the AXP90-X53 is necessary for ITX cases but sacrifices some cooling potential. The Assassin X120 offers a more traditional cooling approach for larger cases. Your case size dictates which tower design you need.
Heat pipes
Both coolers use four 6mm copper heat pipes. They both employ AGHP technology to prevent heat pipe sagging and improve heat transfer. The number of heat pipes is identical. The material composition is also the same. There is no difference in the core heat transfer mechanism between the two units. Both rely on this four-pipe configuration to move heat from the base to the fins. Since the specifications for heat pipes are identical, neither product has an advantage in this specific category. The cooling difference comes from the fan and fin array, not the pipes.
Which CPU Cooler Fits Your Build
You have a small ITX case
The AXP90-X53 stands only 53mm tall. This low profile design allows it to fit into compact chassis where space is extremely limited. You can install it without worrying about memory clearance or case height restrictions, making it the ideal choice for small form factor builds.
You want higher airflow performance
The Assassin X120 uses a larger 120mm fan that moves 66.17 CFM of air. This is significantly more than the AXP90-X53’s 42.58 CFM. The taller 148mm tower and larger fan surface area provide better heat dissipation for standard mid-tower cases, offering superior cooling capacity for most users.
You need broad socket support
Both coolers support modern Intel and AMD sockets. However, the Assassin X120 is designed for standard towers. It includes metal fasteners for easy installation on LGA1700, LGA1851, AM4, and AM5 platforms. This ensures a secure and straightforward mounting process for a wide variety of current generation processors.
The products compared
Thermalright 53mm Low Profile ITX CPU Cooler
Best for: ITX builds requiring under 60mm cooler height
- Socket Compatibility
- AM4, AM5, LGA1150/1151/1200/1700/1851
- Cooler Height
- 53mm
- Heat Pipes
- 4
- Tower Design
- Low-Profile
- Fan Size
- 92mm
- Fan Speed
- 2700 RPM
View on Amazon: Thermalright 53mm Low Profile ITX CPU Cooler Affiliate link
The Thermalright AXP90-X53 is a 53mm low-profile air cooler designed for ITX builds. It features four 6mm heat pipes with AGHP technology and a pure copper base. The included 92mm PWM fan runs up to 2700 RPM with 42.58 CFM airflow. This compact 94.5x95x53mm cooler supports Intel LGA1700/1851 and AMD AM4/AM5 sockets. It suits users needing small chassis compatibility without RAM clearance issues.
Pros
- 53mm total height fits tight ITX cases
- Four 6mm heat pipes with AGHP technology
- 92mm PWM fan provides 42.58 CFM airflow
- Pure copper base for efficient heat transfer
Cons
- Limited to 53mm height, restricting use in standard towers
- Requires motherboard backplate for AMD AM4/AM5 installation
- Single 92mm fan may produce 22.4 dB noise at max speed
Good fit if
- You are building a small form factor ITX PC
- You need a cooler under 60mm to clear RAM modules
- You use Intel LGA1700/1851 or AMD AM4/AM5 sockets
Skip if
- You require a standard ATX tower cooler for maximum cooling
- Your case has less than 53mm of CPU cooler clearance
- You prefer silent operation below 20 dB at high loads
Verdict: Thermalright AXP90-X53 53mm Low Profile CPU Cooler is the right fit for ITX builders who need a compact, 53mm cooler that clears RAM and supports modern sockets. It delivers reliable cooling in tight spaces but cannot match the thermal headroom of larger air coolers.
Thermalright Assassin X120 120mm Air Cooler
Best for: Standard ATX cases needing 120mm cooling
- Socket Compatibility
- AM4, AM5, LGA1700, LGA1851, LGA1200
- Cooler Height
- 148 mm
- Heat Pipes
- 4
- Fan Size
- 120 mm
- Fan Speed
- 1550 RPM
- Material
- Aluminum
View on Amazon: Thermalright Assassin X120 120mm Air Cooler Affiliate link
This 120mm air cooler uses four 6mm heat pipes and a 120mm PWM fan to move 66.17 CFM of air. It stands 148mm tall and weighs 1.42 pounds. The aluminum heatsink and S-FDB bearing fan support modern Intel and AMD sockets. It fits medium-sized cases where the low-profile AXP90-X53 does not.
Pros
- 120mm fan moves 66.17 CFM
- Four 6mm heat pipes with AGHP
- S-FDB bearing for long life
- Supports AM4, AM5, and LGA1700
Cons
- 148mm height blocks tall RAM
- Aluminum heatsink only
- No ARGB lighting on SE model
Good fit if
- You have a standard ATX case
- You need better cooling than 53mm
- You use AM5 or LGA1700 sockets
Skip if
- You have a small ITX case
- You need low RAM clearance
- You want RGB lighting effects
Verdict: Thermalright Assassin X120 120mm Air Cooler offers strong cooling for standard cases. It suits builders who prioritize airflow over compact height.
Specifications side by side
| Spec | Thermalright 53mm Low Profile ITX CPU Cooler | Thermalright Assassin X120 120mm Air Cooler |
|---|---|---|
| Socket Compatibility | AM4, AM5, LGA1150/1151/1200/1700/1851 | AM4, AM5, LGA1700, LGA1851, LGA1200 |
| Cooler Height | 53mm | 148 mm |
| Heat Pipes | 4 | 4 |
| Tower Design | Low-Profile | not stated |
| Fan Size | 92mm | 120 mm |
| Fan Speed | 2700 RPM | 1550 RPM |
| System Type | ITX | not stated |
| Material | not stated | Aluminum |
| Features | Fan | Fan |
| Dimensions | 3.72 × 3.74 × 2.09 inches | 4.72 × 2.8 × 5.83 inches |
| Weight | 1.1 pounds | 1.42 pounds |
| Size | 53mm | not stated |
| Color | AXP90 X53 | not stated |
| Model | AXP90 X53 | AX120 Refined SE |
Frequently asked questions
Does the AXP90-X53 fit in standard ATX cases?
Yes, the AXP90-X53 fits in standard ATX cases, but it is overkill for most builders. This 53mm cooler is designed for tight ITX spaces. In a larger case, you waste potential cooling performance. The Assassin X120 offers better airflow for the same price point in standard towers. Choose the X53 only if your case height restricts you to under 60mm. Otherwise, the larger tower cooler is more efficient for your CPU.
What is the weight difference between the two coolers?
The Assassin X120 Refined SE is heavier than the AXP90-X53. It weighs 1.42 pounds compared to the X53's 1.1 pounds. This extra mass comes from its larger aluminum heatsink and 120mm fan assembly. The X53 is lighter because it uses a compact 53mm profile. This weight difference matters if you are mounting the cooler on a fragile motherboard bracket. Always ensure your motherboard can support the cooler's weight.
Can the Assassin X120 replace the AXP90-X53 for better cooling?
It depends on your case dimensions. The Assassin X120 provides stronger cooling due to its larger 120mm fan and 5.83-inch height. However, it will not fit in cases that require the 53mm AXP90-X53. You must measure your case clearance before switching. If you have room for a standard tower, the Assassin X120 is the better thermal choice. The X53 is strictly a low-profile solution for constrained builds.
How do the dimensions affect RAM clearance?
The AXP90-X53 is designed to clear tall RAM sticks in ITX builds. Its 53mm height leaves more room above the memory slots. The Assassin X120 stands 5.83 inches tall, which often blocks access to RAM in compact layouts. In standard ATX cases, both coolers usually allow easy RAM installation. The X53 offers superior clearance in small chassis. The Assassin X120 requires ample vertical space to function correctly.
Which cooler is better for LGA 1700 sockets?
Both coolers support modern Intel sockets, including LGA 1700 variants like LGA 1851. The Assassin X120 explicitly lists LGA 1851, LGA 1200, and LGA 1151 support. The AXP90-X53 also supports these sockets for ITX compatibility. You can use either cooler with your current Intel CPU. The choice depends on case size, not socket compatibility. Both units provide the necessary mounting hardware for standard Intel platforms.
Is the AXP90-X53 suitable for high-end CPUs?
The AXP90-X53 is suitable for low-power CPUs in ITX builds. It clears RAM and fits tight spaces but lacks the thermal headroom of larger coolers. High-end CPUs generate more heat than this 53mm unit can dissipate. The Assassin X120 handles higher thermal loads better due to its larger surface area. Use the X53 for efficient processors. Reserve the Assassin X120 for systems where airflow and cooling capacity are priorities.