Thermalright SI-100 White ARGB CPU Air Cooler vs Thermalright Assassin King 120 SE ARGB CPU Air Cooler
Updated August 2026 — The Thermalright SI-100 offers better cooling performance and a more compact design, making it the superior choice for most users.
The Thermalright SI-100 offers better cooling performance and a more compact design, making it the superior choice for most users.
Why Thermalright SI-100 White ARGB CPU Air Cooler is better
cooling performance
higher airflow and fan speed
compact design
shorter height for better compatibility
aesthetic appeal
striking white finish with ARGB lighting
Why Thermalright Assassin King 120 SE ARGB CPU Air Cooler is better
price
more budget-friendly option
noise level
quieter operation at max load
installation
easier installation in larger cases
Overall score
Specifications
| Spec | Thermalright SI-100 White ARGB CPU Air Cooler | Thermalright Assassin King 120 SE ARGB CPU Air Cooler |
|---|---|---|
| Max Airflow | 72.37 CFM | 66.17 CFM |
| Max RPM | 2000 RPM | 1550 RPM |
| Noise Level | 27.7 dB(A) | 25.6 dB(A) |
| Socket Support | Intel 1150-2066 | Intel 115X/1200-1700 |
| Material | Aluminum | Aluminum |
Dimension comparison
Brand Overview
Both the Thermalright SI-100 White ARGB CPU Air Cooler and the Thermalright Assassin King 120 SE ARGB CPU Air Cooler come from Thermalright, a brand with over 20 years of experience in the cooling solutions market. The company's reputation for quality and innovation is well-established, making either cooler a reliable choice for users. However, the SI-100 is priced at C$35.90, while the Assassin King is more budget-friendly at C$24.59, making it an attractive option for those looking to save on expenses without sacrificing quality.
Design and Build Quality
In terms of design, the Thermalright SI-100 has a compact form factor, measuring 120mm in length, 108mm in width, and 100mm in height, making it ideal for small to medium-sized cases. Its white finish, paired with ARGB lighting, provides a modern aesthetic. Conversely, the Assassin King measures 120mm by 73mm by 148mm, which is taller and may require more space in your build. While both coolers are constructed from high-quality aluminum and feature durable metal fasteners, the SI-100's shorter height allows for greater compatibility with compact cases, making it suitable for users with limited space.
Cooling Efficiency
When it comes to cooling performance, the Thermalright SI-100 boasts a maximum airflow of 72.37 CFM and operates at a fan speed of 2,000 RPM, ensuring effective heat dissipation. Its unique AGHP 3.0 technology, utilizing 6x6mm heat pipes, helps to counteract the inverse gravity effect in various orientations. On the other hand, the Assassin King offers a maximum airflow of 66.17 CFM and a fan speed of 1,550 RPM. While both coolers employ AGHP technology, the SI-100 has a slight edge in airflow and speed, which could translate to better cooling performance for high-demand applications.
Noise Levels
Noise levels are a key consideration for many users, especially those who value a quiet operating environment. The Thermalright SI-100 operates at a noise level of up to 27.7 dB(A), which is relatively quiet but slightly higher than the Assassin King's maximum noise level of 25.6 dB(A). For users sensitive to noise, the Assassin King may be more appealing due to its lower decibel rating. However, both coolers are designed to provide efficient cooling with minimal noise, making them suitable for gaming or office environments.
Compatibility
Both the Thermalright SI-100 and the Assassin King are compatible with a wide range of Intel and AMD sockets. The SI-100 supports Intel sockets 1150 through 2066 and AMD sockets AM4 and AM5. In contrast, the Assassin King supports Intel sockets 115X and 1200 through 1700, along with AMD sockets AM4 and AM5. This broad compatibility makes both coolers versatile options for different platforms, but the SI-100 offers slightly more flexibility with its wider range of Intel socket support.
Installation Process
Ease of installation can significantly impact user experience. The Thermalright SI-100 features a straightforward installation process, equipped with metal fasteners for both Intel and AMD platforms. Its compact design further simplifies the installation in tight spaces. The Assassin King also includes metal fasteners for easy installation, but its larger height may present challenges when fitting into compact cases. Users with limited experience may find the SI-100 easier to work with due to its smaller dimensions.
Aesthetic Appeal
Aesthetic considerations can be crucial for PC builders looking to showcase their systems. The Thermalright SI-100 features an appealing white finish combined with ARGB lighting, creating a striking visual effect in any build. The Assassin King, while also equipped with ARGB lighting, has a more understated design in its black and silver colour scheme. Ultimately, the choice between the two may come down to personal preference; users seeking a bold look may gravitate towards the SI-100, while those preferring a subtler aesthetic might favour the Assassin King.
Which should you buy?
When deciding between the Thermalright SI-100 White ARGB CPU Air Cooler and the Thermalright Assassin King 120 SE ARGB CPU Air Cooler, consider your specific needs and preferences. The SI-100 is a great choice for users with compact cases who require efficient cooling performance and a visually striking design. However, if you're looking for a more budget-friendly option with slightly lower noise levels, the Assassin King may suit you better. Ultimately, both coolers are high-quality products from a reputable brand, ensuring that whichever you choose, you will be investing in reliable cooling solutions.
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