Thermalright Assassin X 120 SE ARGB CPU Air Cooler vs Thermalright SI-100 White ARGB CPU Air Cooler
Updated August 2026 — The Thermalright SI-100 White ARGB offers better cooling performance and compatibility, making it the superior choice for most users.
The Thermalright SI-100 White ARGB offers better cooling performance and compatibility, making it the superior choice for most users.
Why Thermalright Assassin X 120 SE ARGB CPU Air Cooler is better
lower price
C$24.29 vs C$35.90
quieter operation
25.6 dB(A) vs 27.7 dB(A)
taller design
148mm height for medium cases
Why Thermalright SI-100 White ARGB CPU Air Cooler is better
better airflow
72.37 CFM vs 66.17 CFM
more compatibility
supports more Intel sockets
higher RPM
2000 RPM vs 1550 RPM
Overall score
Specifications
| Spec | Thermalright Assassin X 120 SE ARGB CPU Air Cooler | Thermalright SI-100 White ARGB CPU Air Cooler |
|---|---|---|
| Airflow | 66.17 CFM | 72.37 CFM |
| Noise Level | 25.6 dB(A) | 27.7 dB(A) |
| TDP Support | 125-225W | 125-225W |
| Fan Speed | 1550 RPM | 2000 RPM |
| Socket Support | Intel 115X/1200/1700, AMD AM4 | Intel 1150-2066, AMD AM4/AM5 |
Dimension comparison
Overview of Thermalright CPU Coolers
When it comes to cooling solutions for your CPU, the Thermalright Assassin X 120 SE ARGB and the Thermalright SI-100 White ARGB are two prominent contenders. Both coolers are designed with efficiency and performance in mind, but they cater to slightly different needs and preferences. The Assassin X 120 SE is priced at C$24.29, while the SI-100 comes in at C$35.90, reflecting a difference in design and features that could influence your choice.
Design and Build Quality
The design of a CPU cooler plays a crucial role in both aesthetics and functionality. The Thermalright Assassin X 120 SE ARGB features a height of 148mm and a sleek aluminum heat sink, making it suitable for medium-sized cases. In contrast, the SI-100 White ARGB has a more compact height of 100mm, making it ideal for smaller builds without sacrificing performance. Both coolers boast high-quality PBT + PC materials, ensuring durability and longevity, but the SI-100's lower profile may appeal to those with space constraints.
Cooling Performance
Cooling performance is paramount when selecting a CPU cooler. The Assassin X 120 SE ARGB employs four 6mm heat pipes, which efficiently manage thermal performance with a TDP of 125 to 225W. Its fan can reach a maximum airflow of 66.17 CFM at a noise level of just 25.6 dB(A). On the other hand, the SI-100 features a more powerful fan that can achieve an airflow of 72.37 CFM, although at a slightly higher noise level of 27.7 dB(A). This suggests that while the SI-100 may provide slightly better cooling, it could come at the cost of a bit more noise.
Fan Technology
Both coolers use PWM fans to optimize cooling efficiency. The Assassin X 120 SE’s fan operates at a maximum speed of 1550 RPM, while the SI-100’s fan can reach up to 2000 RPM. This increased speed in the SI-100 contributes to its higher airflow rating, potentially leading to better cooling under load. However, the SI-100 also generates more noise, which may be a consideration for users prioritizing a quiet computing environment.
Compatibility
Compatibility with different CPU sockets is essential for any cooler. The Assassin X 120 SE supports Intel sockets 115X, 1200, 1700, and 17XX, along with AMD’s AM4. In comparison, the SI-100 offers broader compatibility, supporting a wider range of Intel sockets, including 1150, 1151, 1155, 1156, 1200, 1700, 1851, 2066, and 2011, as well as AMD’s AM4 and AM5. This makes the SI-100 a more versatile option for users who may change their CPU in the future.
Installation Process
The installation process for CPU coolers can vary in complexity. Both the Assassin X 120 SE and the SI-100 come equipped with metal fasteners for secure installation on Intel and AMD platforms. However, the compact design of the SI-100, with its lower height and broader compatibility, may make it easier to fit into tight spaces during installation. Users with smaller cases might find the SI-100 more user-friendly.
Noise Levels
Noise levels are a significant factor for many users, particularly those who value a quiet PC experience. The Assassin X 120 SE operates at a quieter noise level of 25.6 dB(A), whereas the SI-100 reaches up to 27.7 dB(A). While the difference may seem minor, it can be perceptible in a quiet environment. If silent operation is paramount, the Assassin X 120 SE might be the preferred choice.
Price Comparison
Pricing is often a decisive factor when purchasing hardware. The Thermalright Assassin X 120 SE ARGB is priced at C$24.29, making it a cost-effective option for those seeking reliable cooling without breaking the bank. Conversely, the SI-100 White ARGB is available for C$35.90, which reflects its additional features and performance capabilities. The price difference of C$11.61 may be justified for users who need the extra cooling power and compatibility of the SI-100.
Which should you buy?
In conclusion, your choice between the Thermalright Assassin X 120 SE ARGB and the Thermalright SI-100 White ARGB will depend on your specific needs and preferences. If you are looking for a more affordable cooler that excels in quiet operation and is suitable for medium-sized cases, the Assassin X 120 SE is an excellent option. However, if you require superior cooling performance, broader compatibility, and don't mind a slightly higher noise level, the SI-100 is worth the investment. Ultimately, each product has its strengths, catering to different users in the ever-evolving landscape of CPU cooling solutions.
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