Are My Fans Installed Correctly?
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Sourcehttps://www.reddit.com/r/PcBuildHelp/comments/1kxoxte/are_my_fans_placed_correctly/
A Reddit user, Slightly_Acoustic, initiated a thread seeking advice on their PC's fan placement, as their CPU, a 5700x3D cooled by an Icemaster 240MM AIO, was experiencing unusually high idle temperatures of 50-55°C. The user provided a diagram illustrating their current fan configuration, with green arrows for intake and red for exhaust, prompting immediate analysis from the community.
Commenters quickly identified the core issue as an imbalanced fan setup, characterized by excessive exhaust and insufficient intake. This imbalance resulted in negative air pressure within the PC case, a condition widely understood to draw dust inward through unfiltered openings, akin to a vacuum. The consensus was that this negative pressure significantly contributed to the elevated CPU temperatures.
The most emphasized recommendation from the community was to reconfigure the bottom fans to act as intake. This was advised to prevent them from conflicting with the GPU's natural intake, to supply fresh, cooler air directly to the graphics card, and to align with the natural upward flow of hot air, though the practical impact of convection versus fan pressure was a minor point of discussion. Additionally, users noted that the side fans, despite the user's diagram, appeared to be set as exhaust based on their design and also needed to be flipped to intake.
The overarching goal of these suggested changes was to achieve a positive air pressure setup within the case, where more air enters than exits. This configuration is crucial for minimizing dust accumulation, as it forces air out through small gaps rather than drawing unfiltered air in. A general guideline emerged, suggesting a slightly higher number of intake fans compared to exhaust fans for optimal positive pressure, with common intake points at the front, bottom, and sides, and exhaust at the rear and top.
While the original top AIO configuration as exhaust was acknowledged as common, some debate arose regarding its optimal placement; alternatives like front or side mounting were suggested to ensure the radiator received cooler air. Other minor, yet practical, tips included keeping the PC off the floor to reduce dust and utilizing software like fancontrol for custom fan curves. Crucially, the original poster later confirmed a significant improvement in CPU idle temperatures, dropping to 42-45°C, after implementing the recommended fan adjustments, validating the community's advice.
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