Phanteks Eclipse P400S Case Review


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Phanteks Eclipse P400S Final Thoughts

The Eclipse P400S makes a perfect computer case for a basic build with its stealthy look, large side panel window, and RGB capable lighting effects. This is a good computer case for people who are looking into building their first computer. It also makes a good silence optimized computer thanks to sound dampening materials on both side panels, the top covers, and the front panel. Computer users who are not planning to upgrade or add additional parts to this case in the near future can consider the Eclipse P400S as their daily driver.

When it comes to water cooling potential, the Eclipse P400S falls short in this category. The front and the rear of the case are the only two areas where a radiator can be mounted. There is just not enough room at the top to install a radiator with fans as the motherboard and RAM modules are in the way. Not only that, but installing the optional 3.5″ HDD mounting bracket for more storage may not allow for a radiator to be mounted at the front. I am not saying it has to support a full-fledged, customized water cooling setup, but the lack of radiator with fan support at the top of the case in this price category is rather disappointing since there is enough room to move the mounts over towards the windowed side panel to make this happen… but let’s get on with the conclusion.

Phanteks Eclipse P400 Finished Build

Phanteks Eclipse P400S Conclusion

The Eclipse P400S does well when it comes to performance. The front of the case supports three 120mm intake fans and the top supports up to two 140mm fans for improved airflow. This is not the best computer case for water cooling because there is no support for a radiator with fans at the top of the case. The front does support a 280mm or a 360mm radiator, but installing a 360mm radiator does require the removal of the mid-plate bracket and the removal of the only two 3.5″ HDD drive caddies in the case. For a standard gaming system, the Eclipse P400S allows adequate airflow to the internal components.

The case looks great with its simple, stealthy exterior look. The large side panel window is large enough to show off the internal components. Having the LED lighting feature is a nice touch giving the Eclipse P400S some character and customization flexibility. The front panel looks modern with just a shiny branding logo towards the bottom of the case, which looks great especially when the LED’s are powered on. Extra LED strips can be purchased from the Phanteks website to be installed inside the Eclipse P400S for interior lighting.

In terms of construction and build quality, the internal structure is pretty sturdy throughout and the side panels are heavier than normal due to the added sound dampening material. The front panel is made of metal and includes air ventilation holes at the top and bottom for providing fresh air to the internal components. I am very happy to see captive thumbscrews on both side panels as this prevents any user from misplacing the thumbscrews when removing the side panels.

The Eclipse P400S does well in terms of functionality. Personally, I would have liked to see support for CPU coolers over 160mm. This could have been an easy fix to future proof this case for computer users looking into adding water cooling hardware into their system sometime in the future. This would prevent them from having to purchase a whole new case.

As of February 2016, the Phanteks Eclipse P400S is available online for $79.99 (Newegg). For plain aesthetics, this case is a great buy due to its modern exterior design. If you do want to add more storage, extra mounting brackets can be purchased separately from the Phanteks website. Overall, the Eclipse P400S is a great case for first time builders or for computer users who want a smaller ATX case without all the gamer-like features. But if you are always adding parts to your system and are looking at water cooling your build, you may want to consider something else.


+ Lots of interior room
+ Good cable management system
+ Captive side panel thumbscrews
+ RGB capable LED lighting feature
+ Modern and simple exterior design
+ Sound dampening materials throughout
+ Removable dust filters for easy cleaning
+ Supports large 280mm or 360mm radiators at the front


– Limited water cooling potential
– Rear supports only a 120mm fan/radiator
– No support for CPU coolers over 160mm tall
– Limited storage potential with 360mm radiator at the front


  • Performance: 8.00
  • Appearance: 9.00
  • Construction: 8.75
  • Functionality: 8.50
  • Value: 8.50

Final Score: 8.55 out of 10.



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  1. Muresan Rares

    Hi I have this case but can’t find out how to plug the front 4pin cable that is in your last photo. Can you help me? Thanks!

    1. Olin Coles

      It’s an LED extension cable, for strip lighting.

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