Installation of Components

Power Supply

The Eclipse P400S case is designed to mount a standard ATX power supply at the bottom. The PSU sits on four rubber pads. As a test, we installed a typical 750W PSU into the case.

The power supply dropped easily into position from the right side and slid into position. It is secured with four screws on the backside panel.  Installing a typical (160mm deep) PSU will leave you with ~4.5” of space between the PSU and HDD cage for stashing cables. The power supply can be mounted either with the fan up to pull air out of the case or with the fan down. The dust filter covered opening on the bottom of the case allows outside air into the PSU when the PSU is mounted with its intake fan down.


The Eclipse P400s silent edition case is designed to mount four different sizes of motherboards including E-ATX, ATX, Micro-ATX and Mini-ITX form factors. We installed both a Mini-ITX and a standard ATX motherboard into the case and in both cases everything lined up as expected. And there is a large cutout behind the CPU socket area to facilitate installing/changing CPU coolers.

(Mini-ITX motherboard)

(Standard ATX motherboard)

VGA Adapters

We also installed several VGA adapters to test the fit and once again everything lined up as expected. The expansion card slots all use thumb screws and the P400S case will support cards up to 395mm (15.2”) long (as long as no optional 3.5” drive bays are installed).

Internal Drives

The internal 3.5” HDD cage is designed to mount two 3.5” HDDs or 2.5” SSDs. The cage contains two plastic drive trays, which are designed to hold either a 3.5” HDD (no tools required) or a 2.5” SSD (mounted with four machine screws).

There are also two “drop-n-lock” brackets above the power supply and below the CPU area cutout on the backside of the motherboard tray for mounting 2.5” SSDs. Drives attach to the brackets with machine screws and the brackets drop and lock into position using keyhole slots and rubber bushings.

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