Thermalright AXP90 X36 Low Profile ITX vs Thermalright AXP90 X47 Black Low Profile

Design and build quality

Both units in this comparison share a robust construction philosophy typical of the Thermalright AXP90 series. The Thermalright AXP90 X36 Low Profile ITX and the Thermalright AXP90 X47 Black Low Profile are built on an all-metal platform designed for durability and efficient heat transfer. Each cooler utilizes a secondary reflow soldering process to ensure strong contact between the heatpipes and the base, which is critical for maintaining thermal performance over extended periods. The inclusion of a back plate fastener in both models adds structural integrity to the installation, preventing motherboard flex during mounting. While the core construction methods are identical, the finish differs slightly, with one offering a standard nickel plating and the other utilizing a black nickel process for corrosion resistance and aesthetic variation.

Cooling height and compatibility

The most significant physical distinction between these two coolers is their total height. The Thermalright AXP90 X36 Low Profile ITX stands at 36mm, making it an exceptional choice for extremely compact ITX chassis where clearance is the primary constraint. In contrast, the Thermalright AXP90 X47 Black Low Profile reaches 47mm in height. This additional 11mm allows for a larger heatsink surface area, which generally translates to better passive dissipation and airflow interaction. Users must measure their case CPU cooler clearance carefully; while 47mm is still considered low profile, the 36mm model guarantees fitment in stricter enclosures where the taller unit might interfere with side panels or top-mounted components.

Performance and thermal capacity

Thermal performance in low-profile coolers is heavily dependent on heatsink volume and heatpipe efficiency. Both models utilize four 6mm heatpipes to transfer heat away from the CPU. The Thermalright AXP90 X36 Low Profile ITX explicitly lists AGHP (Anti-Gravity Heatpipe) technology in its features, which is designed to maintain efficiency regardless of orientation. The Thermalright AXP90 X47 Black Low Profile lists 4×6mm Heatpipes without the AGHP specific label in the provided data, though the construction quality remains high. The taller profile of the 47mm model inherently allows for more fins and surface area, suggesting a higher thermal dissipation ceiling compared to the 36mm variant, assuming airflow is available within the case.

Noise levels and fan specs

Acoustic performance is identical on paper for both units. Both the Thermalright AXP90 X36 Low Profile ITX and the Thermalright AXP90 X47 Black Low Profile specify a noise level of ≤22.4DBA. This indicates that the larger heatsink on the 47mm model does not come at the cost of increased acoustic output. Both fans operate at 12V with a maximum current of 0.2A. This consistency is beneficial for users who prioritize a quiet computing environment, as choosing the taller model for better cooling does not require sacrificing silence. The fan specifications suggest both units are tuned for low-noise operation suitable for home theater PCs or office workstations.

Socket compatibility and installation

Compatibility is a strong suit for both coolers, covering modern mainstream platforms. Both the Thermalright AXP90 X36 Low Profile ITX and the Thermalright AXP90 X47 Black Low Profile support Intel sockets 115X and 1200. For AMD users, both units are compatible with AM4 and AM5 sockets. This broad support ensures that either cooler can be used across multiple generations of hardware without needing a new mounting kit. The installation process is facilitated by the included back plate fastener system mentioned in the features, which simplifies the mounting procedure on both Intel and AMD motherboards. There is no difference in socket support between the two models.

Aesthetics and finish options

Visual differentiation is provided through the plating process used on the heatsink and fan housing. The Thermalright AXP90 X36 Low Profile ITX features a standard nickel plating process, which offers corrosion resistance and a classic silver metallic look. The Thermalright AXP90 X47 Black Low Profile utilizes a black nickel plating process. This not only provides the same acid and alkali resistance and low thermal resistance but also offers a stealthier aesthetic that blends better with dark-themed builds. Both finishes are designed to resist corrosion, ensuring the cooler maintains its appearance over time even in varied environmental conditions.

Price and value proposition

When evaluating cost, the Thermalright AXP90 X36 Low Profile ITX is priced at $20.39, while the Thermalright AXP90 X47 Black Low Profile is listed at $22.39. The price difference is minimal at exactly $2.00. Considering the Thermalright AXP90 X47 Black Low Profile offers increased height and potentially better thermal performance for this small premium, it represents a strong value proposition for users whose cases can accommodate the 47mm height. However, for users strictly limited to 36mm clearance, the Thermalright AXP90 X36 Low Profile ITX provides essential functionality at the lower price point, making it valuable for specific form factors where the taller cooler simply cannot fit.

Which one should you buy?

Your choice depends primarily on your case clearance and aesthetic preferences. If you are building in an ultra-compact chassis with strict height limits, the Thermalright AXP90 X36 Low Profile ITX is the necessary choice due to its 36mm profile. However, for most low-profile builds that can accommodate 47mm, the Thermalright AXP90 X47 Black Low Profile is the recommended option. It provides greater cooling potential through increased heatsink volume, a premium black finish, and identical noise levels for only $2 more. Unless every millimeter counts, the taller model offers better overall performance and visual integration for modern systems.