description Phanteks Eclipse P400S Overview
The Phanteks Eclipse P400S is a mid-tower PC case for ATX, Micro-ATX, and Mini-ITX systems. It is the quieter variant in the P400 family, using sound-dampening material in parts of the chassis and a front panel intended to reduce mechanical noise. The case also provides a lower power-supply shroud, cable-routing space, and versions with either a solid or tempered-glass side panel, making it suitable for builders who want a restrained enclosure with attention to noise control.
help Phanteks Eclipse P400S FAQ
What does the S stand for in Phanteks Eclipse P400S?
The S identifies the quieter variant of the Eclipse P400 family, which uses sound-dampening material on parts of the chassis and panels. Its solid front panel and damping plates are intended to reduce mechanical noise compared with a more open airflow design. [P400S review](https://thinkcomputers.org/phanteks-eclipse-p400s-case-review/)
What motherboards fit the Phanteks Eclipse P400S?
The P400S supports ATX, Micro-ATX, and Mini-ITX boards, with limited support for E-ATX boards up to 272 mm wide. Its listed dimensions are approximately 210 by 465 by 470 mm. [Phanteks P400S manual](https://phanteks.com.tw/assets/manuals/PH-EC416P_Western.pdf)
What cooling hardware can the P400S accommodate?
The case supports up to a 360 mm front radiator in the relevant configuration, although the manual notes that the midplate cover must be removed for that installation. It also supports a 120 mm rear radiator and multiple 120 mm or 140 mm fans. [Phanteks P400S manual](https://phanteks.com.tw/assets/manuals/PH-EC416P_Western.pdf)
What is the main tradeoff of the P400S design?
The sound-dampening panels and closed front reduce noise, but they restrict airflow compared with a mesh-front case. That makes the P400S especially relevant for quieter office or gaming builds, while high-wattage components may benefit from additional intake airflow. [P400S review](https://thinkcomputers.org/phanteks-eclipse-p400s-case-review/)
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