Thermalright Peerless Assassin 140 Black CPU Cooler vs upHere H45K6 Low Profile CPU Cooler 45mm Height - 6 Heat Pipes
Updated August 2026 — The Thermalright Peerless Assassin 140 Black offers superior airflow and aesthetics, making it ideal for larger builds, while the upHere H45K6 excels in compact spaces at a lower price.
The Thermalright Peerless Assassin 140 Black offers superior airflow and aesthetics, making it ideal for larger builds, while the upHere H45K6 excels in compact spaces at a lower price.
Why Thermalright Peerless Assassin 140 Black CPU Cooler is better
better airflow
Thermalright provides 66.17 CFM compared to upHere's 35.34 CFM
aesthetic design
Thermalright features a striking twin-tower design
higher cooling capacity
Thermalright supports more demanding workloads
Why upHere H45K6 Low Profile CPU Cooler 45mm Height - 6 Heat Pipes is better
lower price
upHere is priced at C$49.99 compared to C$54.90 for Thermalright
compact size
upHere fits in Mini ITX cases with a height of 45mm
easy installation
upHere offers tool-free installation in under 5 minutes
Overall score
Specifications
| Spec | Thermalright Peerless Assassin 140 Black CPU Cooler | upHere H45K6 Low Profile CPU Cooler 45mm Height - 6 Heat Pipes |
|---|---|---|
| Airflow | 66.17 CFM | 35.34 CFM |
| Noise Level | 25.6 dB(A) | ≤27 dB(A) |
| Compatibility | LGA1150-1851, AM4/AM5 | LGA115x, AM4/AM5 |
| Heat Pipes | 6 | 6 |
| Fan Speed | 1500 RPM | 800-2800 RPM |
Dimension comparison
Price Comparison
When it comes to pricing, the upHere H45K6 Low Profile CPU Cooler is slightly more affordable, retailing at C$49.99 compared to the Thermalright Peerless Assassin 140 Black CPU Cooler, which is priced at C$54.90. This C$4.91 difference may seem minor, but for budget-conscious consumers, it could make a significant impact. Both products are reasonably priced given their features, making them competitive options in the CPU cooler market.
Design and Size
The Thermalright Peerless Assassin 140 Black boasts a height of 158mm, making it suitable for large and medium-sized chassis, while the upHere H45K6 stands out with its ultra-compact 45mm design that is specifically engineered for Mini ITX cases. The significant difference in height allows the upHere model to fit effortlessly in tight spaces, which is a considerable advantage for small-form-factor builds. This design difference may greatly influence buyers depending on their case size and overall build requirements.
Cooling Performance
In terms of cooling capability, the Thermalright Peerless Assassin 140 Black features a dual-tower design with dual fans, providing strong airflow of up to 66.17 CFM, while operating at a maximum noise level of 25.6 dB(A). On the other hand, the upHere H45K6 utilises six heat pipes and a single 90mm fan that can reach a maximum airflow of 35.34 CFM with a noise level of ≤27 dB(A). Although the upHere is quieter, the Thermalright delivers more airflow, which translates to superior heat dissipation, particularly beneficial for overclocked systems or demanding workloads.
Compatibility
Both coolers offer broad compatibility with various CPU sockets, but they cater to different needs. The Thermalright Peerless Assassin supports Intel sockets LGA1150 through LGA1851 and AMD AM4/AM5, making it versatile for a wide range of builds. Conversely, the upHere H45K6 also supports a variety of Intel and AMD sockets, including the latest models, ensuring it can accommodate most mainstream CPUs. However, its low-profile design guarantees zero RAM obstruction, making it an optimal choice for compact builds where space is at a premium.
Installation
The installation processes for both coolers are designed to be user-friendly. The Thermalright model includes an all-metal fastener system and a Y-type adapter cable for connecting the fans, making installation straightforward. Meanwhile, the upHere H45K6 highlights its tool-free installation that can be completed in under five minutes, appealing to users who prefer a quick and uncomplicated setup. This ease of installation is particularly attractive for novice builders or those aiming for a hassle-free experience.
Noise Levels
Regarding noise levels, both coolers maintain relatively low operational noise, though the Thermalright Peerless Assassin operates at a slightly quieter maximum noise level of 25.6 dB(A) compared to the upHere H45K6, which can reach up to 27 dB(A). While the difference is minimal, those prioritizing a silent computing environment may prefer the Thermalright model. However, both options are designed to provide efficient cooling without becoming a significant distraction during use.
Aesthetic Appeal
The Thermalright Peerless Assassin 140 Black features a more robust and striking design with its twin-tower body and mecha-shaped fins, appealing to users who value aesthetics in addition to performance. In contrast, the upHere H45K6 has a more utilitarian look, focusing on functionality over flair. Depending on personal preference, users may lean toward the Thermalright for a more visually impressive setup, while those prioritising a minimalist approach may prefer the understated design of the upHere cooler.
Which should you buy?
Ultimately, the choice between the Thermalright Peerless Assassin 140 Black and the upHere H45K6 comes down to your specific needs and preferences. If you require a powerful cooler with superior airflow and aesthetics for a mid-tower or large chassis, the Thermalright model is the better option, albeit at a slightly higher price. However, if you are building a compact system and need a reliable, low-profile cooler that won’t obstruct RAM slots, the upHere cooler offers excellent performance at a more accessible price point. Each cooler has its strengths, making them suitable for different types of builds and user requirements.
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