This review analyzes published product information. We have not performed detailed research of this unit.
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A cooler upgrade that starts with a fit check
The Thermalright Peerless Assassin 120 SE reviewed here is the PA120 SE configuration with two TL-C12C 120mm PWM fans. Its dual-tower layout, six heat pipes and supplied Intel and AMD mounting hardware make it worth considering for a desktop cooling upgrade, but physical compatibility deserves attention before cooling expectations. A supported socket alone does not establish that this assembly fits your case, memory and motherboard layout.
This is a specification-based review of the supplied retailer listing, not a hands-on thermal or acoustic test. The evidence establishes dimensions, fan specifications and mounting requirements, but does not establish temperatures on particular processors. The buying decision therefore rests on whether its installation requirements suit your system and whether you need a substantial dual-tower cooler rather than simply another fan connection.
The exact PA120 SE configuration
| Model | Thermalright Peerless Assassin 120 SE / PA120 SE |
|---|---|
| Cooler dimensions | 125 × 135 × 155mm, listed as length × width × height |
| Heatsink construction | Aluminum heatsink, copper base, six 6mm copper heat pipes |
| Layout | Dual tower with two fans |
| Included fans | Two TL-C12C, each 120 × 120 × 25mm |
| Fan connections | 4-pin PWM, 12V |
| Listed fan speed | 1550rpm ±10% |
| Listed airflow and noise | 66.17CFM maximum; noise level ≤25.6dB(A), without supplied test conditions |
| Socket support in feature text | Intel 115X, 1200, 1700/17XX; AMD AM4 and AM5 |
| AMD mounting requirement | Original motherboard backplate required; not included with cooler |
Check height and memory space together
The listed 155mm height is the first measurement to compare with your case’s CPU-cooler clearance specification. The 125 × 135mm footprint also matters: do not treat height as the only possible obstruction. Check the space surrounding the socket, including memory and nearby motherboard components, against the planned installation position.
Thermalright’s listing suggests that the design accommodates memory, but it supplies no numerical RAM-clearance limit. That omission matters more than the broad compatibility language. Without a dimension for the available memory space, the evidence cannot confirm that your particular modules will sit beneath or beside the installed fan without interference.
If your proposed installation depends on moving a fan upward to clear memory, verify that this adjustment is possible and recheck side-panel clearance afterward. Do not assume the advertised 155mm envelope still describes an altered arrangement. For a tightly packaged build, unresolved memory clearance is a reason to seek dimensional confirmation before committing, rather than relying on the socket list.
Mounting hardware and the AMD backplate dependency
The listing says platform-specific mounting plates or fasteners are provided, including metal hardware for Intel and AMD systems. Its feature text names AM4 and AM5 alongside Intel 115X, 1200 and 1700/17XX. Match the specific socket on your motherboard to the mounting instructions and included hardware rather than interpreting the broad 17XX wording as unlimited compatibility.
There is one important inconsistency: the product title also names Intel LGA1851, while the detailed compatibility feature does not explicitly include it. This evidence is not enough to dismiss that title claim, but it is also not enough to treat the documentation as unambiguous. LGA1851 owners should confirm the required mounting kit and instructions for the supplied unit before buying.
AMD installation has a clearer prerequisite. The cooler requires the motherboard’s original backplate, and that part is not included. If a previous cooling installation left you without it, the supplied cooler hardware alone will not satisfy the stated installation requirements. Checking for that backplate before removing an existing cooler can prevent an avoidable interruption.
Plan the two PWM connections before installation
Each included TL-C12C fan is specified as a 12V model with a four-pin PWM connection. Plan how both fans will connect to suitable motherboard headers, following the motherboard’s connection and control guidance. The supplied evidence does not state whether a splitter is included, nor does it provide fan current draw or cable lengths.
Those unknowns limit how confidently you can plan a shared-header arrangement. If you intend to use a splitter, verify its requirements and the combined electrical load against the chosen header’s rating. Do not assume an existing accessory is suitable merely because it has enough ports. Likewise, establish cable reach and routing before fastening everything into a crowded socket area.
This is internal CPU-cooling hardware, not external port expansion. If your setup work also involves laptop peripherals, our separate gaming-laptop USB-C hub guide addresses that different connection problem.
What the specifications say about an upgrade
The aluminum towers, copper base and six 6mm copper heat pipes describe a substantial heat-transfer assembly. Thermalright attributes orientation-related benefits to its AGHP heat-pipe technology, but the supplied listing offers no comparative measurements to quantify that claim. Similarly, the listed airflow and noise figures should not be read as measured results for this cooler inside your computer.
The strongest upgrade case is a compatible desktop whose owner specifically wants this dual-tower, dual-fan configuration and can accommodate its mounting and clearance requirements. The evidence does not identify a validated processor power limit or demonstrate an improvement over your current cooler. If you already own a comparable tower cooler, the supplied specifications alone do not establish that replacement is worthwhile.
Frequently asked questions
What are the main physical dimensions of the Peerless Assassin 120 SE?
The cooler is listed as 125 × 135 × 155mm, with the measurements given as length × width × height. Its 155mm height must be compared with your case’s CPU-cooler clearance specification. The 125 × 135mm footprint also needs checking against memory and nearby motherboard components, because height is not the only possible source of interference.
Which processor sockets are explicitly named for this cooler?
The detailed compatibility information names Intel 115X, 1200 and 1700/17XX, plus AMD AM4 and AM5. The product title also names Intel LGA1851, but that socket is not explicitly included in the detailed compatibility feature. LGA1851 owners should therefore confirm the required mounting kit and instructions for their supplied unit before buying.
What should AMD users check before installing this cooler?
AMD users should confirm that the motherboard’s original backplate is still available, because the cooler requires it and does not include one. If a previous installation left you without that backplate, the supplied cooler hardware alone will not meet the stated installation requirements. Checking before removing an existing cooler can help avoid an interruption during installation.
Do the included fans require one or two motherboard connections?
The cooler includes two TL-C12C fans, and each uses a four-pin PWM connection. You should plan how both fans will connect to suitable motherboard headers before installation. The supplied evidence does not state whether a splitter is included, and it provides no fan current draw or cable lengths, so a shared-header arrangement requires additional verification.
Verdict: suitable when the installation details line up
The Peerless Assassin 120 SE offers a clearly specified dual-fan assembly and mounting support for several named desktop sockets. Its practical appeal depends on confirming the 155mm height, memory space, fan wiring and, on AMD systems, the retained motherboard backplate. Resolve those checks first; buyers needing confirmed tall-memory clearance, unambiguous LGA1851 documentation or processor-specific thermal results need more information than this listing provides.
Sources: Supplied Thermalright Peerless Assassin 120 SE retailer listing.
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