be Quiet! Dark Rock Pro 5 Quiet Cooling CPU Cooler vs Thermalright AXP90 X47 Full Low Profile CPU Cooler

Cooling Performance and Heat Pipe Technology

The be Quiet! Dark Rock Pro 5 offers superior cooling performance compared to the Thermalright AXP90 X47, largely due to its advanced heat pipe configuration and fan design. The Dark Rock Pro 5 features seven high-performance copper heat pipes, whereas the AXP90 X47 uses four 6mm heat pipes with AGHP technology. The Dark Rock Pro 5’s heat pipes are enhanced by a special black coating containing ceramic particles that help maintain low temperatures during peak CPU loads, including heavily overclocked systems.

In contrast, the Thermalright AXP90 X47 focuses on efficient heat dissipation through its AGHP technique, which addresses inverse gravity effects and improves cooling in both vertical and horizontal orientations. Its copper radiator also benefits from secondary welding processes that double the cooling effect. However, the Dark Rock Pro 5’s more substantial heat pipe count and dual fan setup generally provide better thermal management for high-performance CPUs.

Fan Design and Noise Levels

When it comes to noise and fan technology, the be Quiet! Dark Rock Pro 5 is designed for near-silent operation with its two Silent Wings PWM fans, which feature fluid-dynamic bearings, smooth 6-pole motors, and optimized fan blades. These fans can operate in Quiet Mode at a maximum speed of 1500 rpm, or Performance Mode up to 2000 rpm, offering a balance between silence and cooling power. The decoupled fan mounting with vibration-isolating elements further reduces noise-generating turbulence.

The Thermalright AXP90 X47 is equipped with a single 92mm PWM fan that runs at up to 2700 rpm ± 10%, producing a noise level of 22.4 dB(A). While this fan supports automatic temperature control and is designed for quiet operation, its higher maximum speed compared to the Dark Rock Pro 5’s fans might result in increased noise under load. Therefore, the Dark Rock Pro 5 is generally quieter, especially when operating in Quiet Mode.

Size and Compatibility

Size and compatibility cater to different user needs in these two coolers. The Thermalright AXP90 X47 stands out with its extremely low profile, measuring only 47mm in height, making it ideal for small form factor builds such as HTPCs, ITX cases, and compact models where space is a premium. Its design also eliminates concerns about memory clearance, which is a common issue with larger coolers.

On the other hand, the Dark Rock Pro 5 is a larger unit intended for high-end desktop builds, with a design that requires more internal space but offers enhanced cooling capability. It includes a detachable mesh top cover with an integrated middle fan, adding to its bulk but also to its performance and aesthetic appeal. Users with roomy cases and a focus on performance will benefit from the Dark Rock Pro 5, while those constrained by space should consider the AXP90 X47.

Installation and Mounting Systems

Installation ease and mounting options vary significantly between these two coolers. The Dark Rock Pro 5 uses a black mounting kit with a pre-installed mounting bridge and fixing screws, designed for simple and elegant installation. This kit complements the cooler’s German engineering and quality focus, ensuring a secure fit and compatibility with a range of CPU sockets.

The Thermalright AXP90 X47 comes with metal mounting fasteners tailored for a broad range of CPU sockets, including Intel’s LGA1700, 1150, 1151, 1155, 1156, and 1200, as well as AMD’s AM4 and AM5 platforms. It also provides a manual and installation video, supporting user-friendly assembly. While both coolers support modern CPU sockets, the AXP90 X47’s compatibility is explicitly broad, making it a convenient choice for diverse systems, especially small builds.

Materials and Build Quality

Material quality is a highlight of the Dark Rock Pro 5, which features a nickel-plated base compatible with liquid metal thermal grease such as DC2 Pro. This compatibility can further improve thermal conductivity and cooling efficiency for high-end CPUs. The cooler also boasts a black coating with ceramic particles on its copper heat pipes, enhancing durability and heat dissipation.

The Thermalright AXP90 X47’s radiator is made of pure copper, which increases oxidation resistance and contributes to effective heat transfer. It also includes thermal paste to optimise cooling out of the box. While both coolers use high-quality copper components, the Dark Rock Pro 5’s additional coatings and liquid metal compatibility position it as a more premium option focused on top-tier performance and longevity.

Price and Value

There is a significant price difference between these two coolers, reflecting their positioning and features. The be Quiet! Dark Rock Pro 5 is priced at C$169.99, representing a premium investment in advanced cooling technology, noise reduction, and build quality suitable for high-performance and overclocked systems.

In contrast, the Thermalright AXP90 X47 is priced at just C$43.39, offering an affordable solution for users needing a low-profile, quiet CPU cooler compatible with a wide range of platforms. It delivers good value for compact builds or budget-conscious users but does not match the Dark Rock Pro 5 in cooling power or noise control.

Design and Aesthetics

The Dark Rock Pro 5 continues the iconic and distinctive Dark Rock design known for its sleek, all-black appearance and mesh top cover with an integrated fan. This design not only provides aesthetic appeal but also practical benefits like improved airflow and noise reduction. The cooler emphasizes German design and engineering, which appeals to users looking for a premium, stylish component.

The Thermalright AXP90 X47, while more utilitarian in design, focuses on minimalism and functionality due to its low-profile form factor. Its compact size and practical design make it ideal for small builds but do not offer the same visual impact or premium feel as the Dark Rock Pro 5. Users prioritising looks and brand prestige will likely prefer the Dark Rock Pro 5.

Which should you buy?

Your choice between the be Quiet! Dark Rock Pro 5 and the Thermalright AXP90 X47 depends on your priorities. If you need top-tier cooling for high-performance or overclocked CPUs with near-silent operation and are willing to invest C$169.99, the Dark Rock Pro 5 is the clear winner. It offers seven heat pipes, dual Silent Wings fans with adjustable speed modes, and premium build materials that enhance thermal performance and longevity.

Conversely, if you have space constraints, such as in HTPC or ITX builds, or are on a tight budget, the Thermalright AXP90 X47 at C$43.39 provides excellent value. Its ultra-low 47mm height, broad CPU socket compatibility, and quiet 92mm PWM fan make it a practical choice for compact systems, albeit with less cooling power and fewer premium features than the Dark Rock Pro 5.

In summary, choose the Dark Rock Pro 5 for maximum cooling performance and low noise in a full-sized build, and the AXP90 X47 for compact, budget-friendly cooling with solid compatibility and quiet operation.