Phanteks Eclipse P400S Tempered Glass Case Review


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System Building with Phanteks Eclipse P400S Tempered

Test System

  • Motherboard: ASRock Fatal1ty 990FX Killer
  • System Memory: 2x4GB 1600MHz DDR3
  • Processor: AMD Phenom II X4 945 @ 3GHz
  • Audio: Onboard RealTek HD Audio
  • Video: Gigabyte R9 270X 2GB GDDR5 Windforce Edition
  • Disk Drive 1: Toshiba Q Series 128GB SSD
  • Enclosure: Phanteks Eclipse P400S Tempered Glass
  • PSU: Thermaltake 430W TR2
  • Monitor: HP 23bw 23″ IPS display
  • Operating System: Windows 10 Professional 64-Bit


The results turned out great with the P400S Tempered case. Motherboard standoff screws were already in place for a standard ATX motherboard. This reduced installation time as I only had to drop in the motherboard and plug everything else in. The front does support a 360mm radiator with the mid-plate removed, but I opted for a mid-sized tower air cooler for this build. Larger air coolers, like the Noctua NH-D15 and the Phanteks PH-TC14PE, did not fit as they exceeded the 160mm CPU height limit this case offered.

Unlike the original P400 and previous Phanteks cases, the text on the Velcro straps were right-side up. The straps behind the motherboard tray allowed for easy cable management. I used only a few cable ties to tie up some of the cables down in the power supply chamber. Without them, cable management would still look good even with just the three built in straps. I also used a CPU power extension cable so I would not have to route the cable towards the rear. Unfortunately, there were no cable tie-down points anywhere in that location to tie down a CPU power cable.

The P400S Tempered maintained the same top panel as its predecessor. This meant there was no support for a radiator and a few fans. Personally, I would have liked to see water cooling support at the top just to give it some extra cheddar. But as a budget oriented case, I was happy enough with water cooling support at the front and rear.

Phanteks Eclipse P400 Radiator on Top

The P400S Tempered case is compatible with the Phanteks modular 3.5″ HDD bracket. These modular mounting brackets are sold separately and make a good option for a computer built for storage.

Phanteks Eclipse P400 Additional HDD Bracket

With a hard drive installed and the bracket in place, the front fan was just four to five millimeters away from touching the bracket. Thicker radiators may have clearance issues with the brackets installed. If you plan to water cool your system with multiple storage devices installed, you may run into some trouble.

With the system powered on, the LED’s looked and worked great. The fans were mostly quiet even at high settings. RGB color reproduction was fairly good with white having a tint of blue to it, while red was noticeably darker than any other color. Lighting effects worked well with its static, breathing, and spectrum effects as the colors transitioned very smoothly.

The P400S Tempered really shined with its tempered glass side panel installed. Its simple body design complemented the glass side panel along with its interior lighting.

With the system fully enclosed, the system ran very quietly. Sound dampening material covers the front panel, the opposite side panel, and the top ventilation covers. The system ran pretty quietly with the two pre-installed fans set to high. GPU and CPU temperatures ran cool and did not have any overheating issues. For warmer systems, they could stay frostier by installing a few fans at the top.

If the Eclipse P400S was wider, it would have been able to support tall CPU coolers, like the Noctua NH-D15 and the Phanteks PH-TC14PE, a rear 140mm fan, and water cooling support at the top. But as a budget oriented case, it made sense to keep things simple for new system builders. An enthusiast would wonder why there is no water cooling support at the top, but that is where something like the Enthoo Pro M and Evolv ATX comes in. However, the LED lighting and the option to manually control fan speed settings using the fan control button were nice features to have.

Let’s go ahead and finish up with my final thoughts and conclusion.


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