Thermalright Assassin X 120R SE Plus CPU Cooler Review (2026): A Spec-Based Look
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
This thermalright assassin x 120r se plus CPU cooler review examines a compact air cooling solution designed for standard cases. The unit features four 6mm heat pipes and dual 120mm PWM fans. These fans operate at 1550 RPM, balancing airflow and noise levels. The heatsink measures 148mm in height, ensuring compatibility with many mid-tower chassis. It supports major Intel and AMD sockets. This spec-based look helps you determine if the design meets your thermal needs.
What stands out
- Four 6mm heat pipes use direct touch technology with thermal paste for efficient heat transfer.
- Dual 120mm PWM fans provide up to 66.17 CFM of airflow at 1550 RPM.
- S-FDB bearings reduce blade shaking and extend fan lifespan while minimizing noise.
- Frosted black top cover adds a classic aesthetic to the aluminum fin stack.
Who it fits
Good fit for
You should consider this cooler if you build in a mid-tower case with limited CPU cooler height clearance. The 148mm profile fits well in standard enclosures. It suits users who prioritize quiet operation, as the fans stay under 25.6 dB. The dual fan setup helps dissipate heat from AM4, AM5, and Intel LGA sockets. It is a practical choice for mainstream processors that do not require massive cooling capacity.
Who should skip it
Skip this option if you have a small form factor case with a strict 148mm height limit. The dual fans add width, so check your RAM clearance. Users with high-end, power-hungry CPUs may find the single 120mm fan area insufficient. The aluminum fins offer less surface area than copper alternatives. If you need extreme overclocking headroom, look for a larger tower design with more heat pipes.
Verdict: The Thermalright Assassin X 120R SE Plus is a quiet, compact air cooler suitable for mainstream builds. Its dual fans and heat pipe design offer reliable cooling for standard processors.
Key specs explained for this cooler
4 Heat Pipes
This cooler uses four 6mm copper pipes to move heat from the CPU base to the aluminum fins. More pipes generally mean better heat transfer capacity for the size. This setup helps keep temperatures stable under load. You should compare this count with other single-tower coolers, as many use only four pipes. It is a standard configuration for efficient mid-range air cooling performance.
1550 RPM Speed
The included fans spin at 1550 RPM to push air through the heatsink. This speed balances cooling power with acoustic output. Higher RPMs move more air but create more noise. This value sits in a practical range for general use. When shopping, compare this speed against fans rated below 1800 RPM for quieter operation or above for maximum airflow in larger cases.
120mm PWM Fan
The cooler features a standard 120mm fan that supports PWM control. This allows your motherboard to adjust fan speed automatically based on CPU temperature. PWM fans are more efficient than DC fans. You benefit from dynamic cooling that responds to thermal changes. Compare this size with 140mm fans, which move more air at lower speeds for potentially quieter performance in compatible cases.
148mm Height
The total height of the unit is 148mm, which determines if it fits inside your computer case. This dimension is critical for clearance above the RAM slots. Many mid-tower cases accommodate this height, but some smaller cases may not. You must check your case specifications before buying. Compare this height with taller coolers, which offer more surface area but require more vertical space inside your chassis.
Design and build overview
According to the listing, the Thermalright Assassin X 120R SE Plus measures 125 x 96 x 148 mm. This compact footprint fits medium-sized cases without blocking memory slots. The heatsink uses aluminum fins to expand the dissipation area. Four 6mm heat pipes connect directly to the base. This layout moves heat away from the processor efficiently. The unit includes metal fasteners for Intel and AMD platforms, simplifying installation for you.
The cooler features dual 120mm PWM fans. These fans operate at 1550 RPM, providing 66.17 CFM of airflow. Noise levels stay at or below 25.6 dB(A). This balance allows for quiet operation during light tasks while maintaining cooling performance when needed. The fans use S-FDB bearings, which reduce blade shaking and extend component life. This bearing type helps keep noise low over time.
The base uses a direct-touch heat pipe process with thermal paste for better conductivity. A frosted black top cover adds a classic finish. The dual PWM control lets you adjust fan speed via your motherboard. This setup gives you flexibility in managing temperatures and noise. The design prioritizes practical cooling within a standard form factor, making it suitable for users who need reliable performance without excessive bulk.
Setup And Daily Use Guide
The listing states that the Thermalright Assassin X 120R SE Plus includes metal fasteners for both Intel and AMD platforms. This design allows you to install the cooler on sockets such as AM4, AM5, LGA 1700, LGA 1200, LGA 1150, and LGA 1151. The inclusion of these specific mounting brackets means you do not need to purchase separate hardware for most modern systems. The package comes with dual 120mm PWM fans, which connect via a standard 4-pin header. This interface lets your motherboard control the fan speed automatically based on system temperature. The fans operate at a maximum of 1550 RPM. This speed provides airflow of up to 66.17 CFM while keeping noise levels at or below 25.6 dB(A). The use of S-FDB bearings is noted to reduce blade shaking and extend the operational life of the unit. In daily use, the 148mm height requires you to verify clearance with your case. The cooler fits medium-sized computer cases. The direct touch heat pipe process and thermal paste between the pipes and base are intended to lower CPU temperatures efficiently. The aluminum fins expand the heat dissipation area. The frosted black top cover adds a classic aesthetic. You should ensure your case supports this width and depth to avoid blocking other components. The dual PWM fans work together to provide quiet cooling. This setup is designed for users who want straightforward installation and reliable performance without complex adjustments.
Before You Buy This Cooler
You should verify your case supports a 148mm height before purchasing. This cooler fits medium-sized cases, but larger towers may block memory or side panels. The listing includes metal fasteners for AM4, AM5, LGA 1700, LGA 1200, LGA 1150, and LGA 1151. Ensure your motherboard socket matches one of these options. The dual PWM fans help keep noise low while providing steady airflow. You may need to adjust fan curves in your BIOS for optimal balance between cooling and silence. Regular upkeep involves dusting the aluminum fins with compressed air. This model sits alongside other efficient air coolers in the guide. It offers a practical solution for users who prioritize quiet operation and compact dimensions. Check your RAM clearance carefully, as the fans sit close to the memory slots. This cooler is a solid choice for standard builds that do not require extreme overclocking capabilities.
Check before you buy
- Verify your case supports 148mm cooler height.
- Check motherboard socket matches AM4, AM5, or LGA 1700.
- Ensure RAM clearance fits the 120mm fans.
- Confirm your case width allows 96mm cooler depth.
The product at a glance
Thermalright Assassin X 120R SE Plus
Best for: Quiet cooling in medium-sized PC cases
- Cooler Height
- 148mm
- Heat Pipes
- 4
- Fan Size
- 120mm
- Fan Speed
- 1550RPM
- Socket Compatibility
- AM4, AM5, LGA 1700, LGA 1200, LGA 1150, LGA 1151
- Features
- Fan
View on Amazon: Thermalright Assassin X 120R SE Plus Affiliate link
The Thermalright Assassin X 120R SE Plus is a 120mm air cooler featuring four 6mm heat pipes and dual PWM fans. It measures 148mm in height, fitting medium-sized cases. The fans run at 1550 RPM with S-FDB bearings for quiet operation. It supports AM4, AM5, and LGA 1700 sockets. This cooler suits users needing reliable cooling for standard desktop builds without excessive bulk.
Pros
- Four 6mm heat pipes with direct touch base
- Dual 120mm PWM fans at 1550 RPM
- S-FDB bearings reduce noise and extend life
- Supports AM4, AM5, and LGA 1700 sockets
Cons
- Single 120mm fan size limits max heat dissipation
- 148mm height may block tall RAM modules
- No RGB lighting on the fans
Good fit if
- You need a compact cooler for a medium case
- You use AM4, AM5, or LGA 1700 sockets
- You prefer quiet operation under 26 dB
Skip if
- You require dual 120mm fans for higher cooling
- You need RGB lighting for your build
- Your case has less than 148mm CPU clearance
Verdict: Thermalright Assassin X 120R SE Plus Air Cooler is a solid choice for users with medium cases and standard sockets who prioritize low noise over extreme cooling capacity.
Specifications side by side
| Spec | Thermalright Assassin X 120R SE Plus |
|---|---|
| Cooler Height | 148mm |
| Heat Pipes | 4 |
| Fan Size | 120mm |
| Fan Speed | 1550RPM |
| Socket Compatibility | AM4, AM5, LGA 1700, LGA 1200, LGA 1150, LGA 1151 |
| Features | Fan |
| Dimensions | 4.92 × 3.78 × 5.83 inches |
| Color | AX120R SE PLUS |
| Model | AX120R SE PLUS D6 |
Frequently asked questions
Is the Thermalright Assassin X 120R SE Plus compatible with AM5 sockets?
Yes, this cooler supports the AM5 platform. The product data lists AM5 alongside AM4, LGA 1700, LGA 1200, LGA 1150, and LGA 1151. This broad socket compatibility allows you to use it on recent AMD Ryzen processors and older Intel motherboards without needing separate mounting hardware.
What is the physical size of the Thermalright Assassin X 120R SE Plus?
The heatsink measures 3.78 inches in width, 5.83 inches in height, and 4.92 inches in length. These dimensions correspond to a compact 120mm form factor. You should check your case specifications to ensure it can accommodate a tower of this height and width.
How many heat pipes does the Thermalright Assassin X 120R SE Plus have?
The cooler features four heat pipes. These pipes transfer heat from the CPU base to the aluminum fins. This configuration helps distribute thermal energy efficiently across the heatsink surface, supporting stable temperatures during typical computing loads.
Does the Thermalright Assassin X 120R SE Plus include a fan?
Yes, the product listing explicitly includes a fan as part of the package. The review section notes it uses dual 120mm PWM fans that operate at 1550 RPM. This setup is designed to balance airflow volume with noise output for quieter operation.
Is this cooler suitable for medium-sized PC cases?
Yes, the product is best for quiet cooling in medium-sized PC cases. Its compact footprint is designed to fit standard chassis without blocking memory slots. The listed dimensions confirm it is smaller than full-size tower coolers, making it a practical choice for mid-tower builds.
What is the model number for the Thermalright Assassin X 120R SE Plus?
The specific model identifier is AX120R SE PLUS D6. The listing also references AX120R SE PLUS as the color or variant name. You can use this model number to verify compatibility charts or find replacement parts if needed.
Does the Thermalright Assassin X 120R SE Plus support LGA 1700?
Yes, LGA 1700 is listed in the socket compatibility section. This covers Intel's 12th, 13th, and 14th generation processors. The included metal fasteners ensure a secure fit for these modern Intel platforms alongside the AMD sockets.