Thermalright Peerless Assassin 120 CPU Cooler Review: Who It Fits and Who Should Skip It
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This thermalright tr peerless assassin 120 se CPU cooler review focuses on a dual-tower air cooler designed for efficient heat dissipation. It features six 6mm copper heat pipes and two 120mm PWM fans. The fans spin at up to 1550 RPM, delivering rated airflow of 66.17 CFM. The heatsink measures 155mm in height, which fits most mid-tower cases. This setup uses AGHP technology to manage heat transfer regardless of orientation. You get a robust cooling solution built for standard desktop builds.
What stands out
- Six 6mm pure copper heat pipes with AGHP technology
- Dual 120mm PWM fans reaching 1550 RPM
- Dual tower heatsink with aluminum and copper materials
- Rated noise level of 25.6 dB(A) or less
- SS2 installation system with metal pressure plate
Who it fits
Good fit for
This cooler suits users with Intel LGA1700, LGA1200, or AMD AM4/AM5 sockets who need reliable cooling for mid-range processors. The 155mm height fits most standard cases, provided you check clearance. The dual-fan design offers strong airflow without excessive noise. If you want a straightforward, high-performance air cooler without RGB lighting or complex software, this model delivers. It is ideal for builders prioritizing thermal performance over aesthetics.
Who should skip it
You should look elsewhere if your case cannot accommodate a 155mm tall cooler. The cooler does not include a backplate for AM4 or AM5 installations, so you must use the motherboard’s original backplate. It lacks ARGB lighting in the standard PA120 SE version, though white and ARGB variants exist. If you need a cooler for extreme overclocking or very high TDP CPUs, this air cooler may not provide sufficient cooling headroom compared to larger or liquid solutions.
Verdict: The Thermalright Peerless Assassin 120 SE is a practical, spec-driven air cooler for standard builds. It offers strong thermal performance for its size and socket compatibility.
Key specs explained for this cooler
Fan Size: 120mm
The fans measure 120 millimeters on each side. This is the standard size for most mid-tower cases. You get a balance of airflow and noise. Smaller fans spin faster to move air, which creates more sound. Larger fans move more air quietly but need deeper cases. This size fits the majority of computer chassis available today.
Fan Speed: 1550 RPM
The fans rotate at 1550 revolutions per minute. This speed pushes air through the fins efficiently. It is not the highest possible speed, so noise remains low. You get steady cooling without loud fan noise. Compare this to silent fans at 1000 RPM or performance fans at 2000 RPM for different noise profiles.
Heat Pipes: 6
Six copper pipes carry heat from the base to the fins. More pipes spread the heat load better. This helps the cooler handle high-end processors without overheating. You get more thermal capacity than a four-pipe design. Look for this count when comparing air coolers for powerful CPUs that generate significant heat.
Tower Design: Dual tower
The heatsink has two separate blocks of fins. This doubles the surface area for heat dissipation. You get better cooling performance than single-tower models. The design requires more width in your case. Ensure you have enough room on both sides of the CPU socket for proper airflow and installation.
Cooler Height: 155mm
The total height is 155 millimeters. This is taller than many standard air coolers. You must check your case specifications before buying. Some cases only support coolers up to 150mm or 160mm. Verify clearance to avoid blocking side panels or RAM modules during installation.
Design and build quality
The heatsink uses a dual-tower layout made from aluminum fins and a copper base. Six 6mm copper heat pipes connect the base to the fins. The listing notes AGHP technology for these pipes, which addresses gravity effects during vertical or horizontal installation. This design aims to maintain consistent heat transfer regardless of how you mount the cooler. The base is soldered to the pipes for better thermal contact.
The unit measures 125 by 135 by 155 millimeters. You must check your case clearance because the 155 millimeter height exceeds many standard limits. The dual towers provide more surface area for heat exchange. The fans include cutouts on the fins to fit RAM modules. This improves compatibility with tall memory sticks in tight spaces.
Two 120mm PWM fans are included. They spin at up to 1550 RPM according to the listing. This speed delivers a rated airflow of 66.17 CFM. The noise level stays at or below 25.6 dB(A). The cooler uses a metal pressure plate and the SS2 install system. This setup helps achieve better contact with the CPU surface. The finish is available in black or white with ARGB options. You choose the look that matches your build.
Setup and everyday use
Installation begins with mounting the cooler to your motherboard socket. The unit supports Intel LGA 1700, 1200, 1150, 1151, and AMD AM4 and AM5 platforms. Thermalright includes an SS2 install system and a metal pressure plate. These components help achieve better contact with the CPU surface. If you are using an AMD AM4 or AM5 board, you must use the original motherboard backplate. This backplate is not included in the box. You need to verify that your PC case can accommodate the cooler height of 155 millimeters. The dual-tower design is substantial, so check clearance against RAM modules. The fans feature cutouts to fit around tall memory sticks, which improves compatibility in tight spaces.
Daily operation relies on the included TL-C12C fans. They connect via a 4-pin PWM cable, allowing your motherboard to adjust speed automatically. The listed maximum speed is 1550 RPM. At this speed, the fans move up to 66.17 CFM of air. This airflow pushes heat through the aluminum fins and copper base. The AGHP technology in the six heat pipes ensures efficient heat transfer regardless of whether you mount the cooler vertically or horizontally. The rated noise level is 25.6 dB(A) at maximum speed. This is a quiet operation for standard desktop use. You do not need extra software to manage the fans, as the PWM connection handles control directly through your system BIOS or UEFI.
Check clearance before buying
Before you buy, check your case clearance. This cooler stands 155 millimeters tall. You must verify that your PC case supports this height. If your case is compact, this dual-tower unit may not fit. Also, check your RAM clearance. The fans have cutouts to help clear tall memory modules, but you should still measure your specific sticks. Ensure your motherboard has the original backplate if you are using AMD AM4 or AM5 sockets. This backplate is required for installation and is not included. You will need to mount the SS2 system and metal pressure plate correctly. This cooler sits alongside 1 other options in our guide. It offers strong airflow for its size. If you need a reliable air cooler for modern sockets, this is a solid choice. Just confirm your physical space first. No extra software or apps are needed for basic operation. Keep the fans clean to maintain performance.
Check before you buy
- Verify your PC case supports 155mm cooler height.
- Check RAM clearance with the fan cutouts.
- Confirm your motherboard has the original backplate for AM4/AM5.
- Ensure your CPU socket matches LGA 1700 or AM5.
The product at a glance
Thermalright Peerless Assassin 120 CPU Cooler
Best for: LGA1700 and AM5 systems with 155mm clearance
- Socket Compatibility
- LGA1700/1851/1200/1150/1151, AM4/AM5
- Cooler Height
- 155mm
- Heat Pipes
- 6
- Tower Design
- Dual tower
- Fan Size
- 120mm
- Fan Speed
- 1550 RPM
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The Thermalright Peerless Assassin 120 SE is a dual-tower air cooler with a 155mm height. It uses six 6mm copper heat pipes with AGHP technology to manage heat in any orientation. The included TL-C12C fans run at 1550 RPM, moving up to 66.17 CFM of air. It supports Intel LGA1700 and AMD AM5 sockets. This cooler suits users needing strong cooling performance without excessive bulk.
Pros
- Dual-tower heatsink design for increased surface area
- Six 6mm copper heat pipes with AGHP technology
- Fans reach 1550 RPM with 66.17 CFM airflow
- Supports LGA1700 and AM5 sockets
Cons
- 155mm height may not fit in smaller cases
- AM4 and AM5 installation requires the motherboard's original backplate
- No RGB lighting on the base PA120 SE model
Good fit if
- You need a high-performance air cooler for modern sockets
- You have a case that accommodates coolers up to 155mm
- You prefer quiet operation under 25.6 dB
Skip if
- You are building in a compact case with limited CPU cooler clearance
- You want a cooler that includes an AM4/AM5 backplate
- You need RGB lighting on the cooler base
Verdict: The Thermalright Peerless Assassin 120 SE delivers robust cooling for LGA1700 and AM5 systems through its dual-tower design and AGHP heat pipes. It is the right choice for builders with adequate case clearance who prioritize thermal performance over aesthetic lighting.
Specifications side by side
| Spec | Thermalright Peerless Assassin 120 CPU Cooler |
|---|---|
| Socket Compatibility | LGA1700/1851/1200/1150/1151, AM4/AM5 |
| Cooler Height | 155mm |
| Heat Pipes | 6 |
| Tower Design | Dual tower |
| Fan Size | 120mm |
| Fan Speed | 1550 RPM |
| Dimensions | 4.92 × 5.31 × 6.1 inches |
| Color | PA120 SE |
Frequently asked questions
Does the Thermalright Peerless Assassin 120 SE fit LGA 1851 sockets?
Yes, the cooler supports the LGA 1851 platform. It also works with LGA 1700, LGA 1200, and LGA 1151 sockets. For AMD, it fits AM4 and AM5 systems. This broad compatibility makes it a versatile choice for modern builds.
How tall is the Thermalright Peerless Assassin 120 SE?
The cooler stands 6.1 inches tall. This equals approximately 155 millimeters. You must check your PC case specifications to ensure it can accommodate this height. Compact cases often have lower clearance limits that may not fit this dual-tower design.
What type of heat pipes does this cooler use?
It uses six 6mm copper heat pipes. The listing highlights AGHP technology for these pipes. This design helps manage gravity effects, ensuring efficient heat transfer whether the cooler is mounted vertically or horizontally. The copper material aids in rapid heat conduction.
Is this cooler suitable for AM5 motherboards?
Yes, it is designed for AM5 systems. The product data lists AM5 as a compatible socket. It also supports AM4. This makes it a strong option for Ryzen 7000 and 9000 series processors, provided your case has sufficient internal height.
What are the physical dimensions of the heatsink?
The heatsink measures 5.31 inches in width and 4.92 inches in length. Its height is 6.1 inches. These dimensions define the space it occupies on your motherboard. You should verify that nearby RAM slots and other components do not interfere with the fan placement.
Does this model include RGB lighting?
The product name includes 'SE,' which typically denotes a Silent Edition. The data does not mention RGB lighting or aesthetic features. It focuses on thermal performance and robust cooling for LGA1700 and AM5 systems. You should expect a straightforward, functional design without extra lighting.