Phanteks Enthoo Primo: Giant Tower Case

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The internal construction is fairly solid as one would expect for a premium model. Nothing on the inside of the chassis has any noticeable give, feeling solid all the way around. The interior is laid out in such a way to support a wide array of watercooling options, making it incredibly spacious to work with.

The side panels are a reasonably thick 0.9 mm. They go on in a similar fashion to the Antec Solo — a long catch at the front is inserted at an angle, wrapping around a column at the front of the case, forming a hinge. The back of the panel swings inward and it's secured with two thumbscrews.

The fan and radiator mounting points on the right panel are covered up by default. The fan placement has a thin plastic cover attached using magnet strips while the radiator placement is blocked off with a bolted on solid metal panel.

Both the top of the case and the front bezel can be removed with a forceful pull. On the top panel are yet more spots for multiple fans/radiators.

The Enthoo Primo's layout is essentially traditional except that the power supply and hard drives are cordoned off on the opposite side. The ridiculous watercooling support also makes it very tall and luxuriously spacious. Along with the intakes there are three more included 140 mm fans, one at the bottom, one at the rear, and one at the top.

A bracket covering the space between the motherboard tray and drive cage helps hide any cables in this vicinity but it's primary purpose is for mounting a reservoir. Unfortunately, leaving it in place limits the maximum graphics card length so most enthusiasts will toss it aside.

The five included fans all have very long cables in order to hook up with a fan control hub near the center of the back of the motherboard tray. Routing them through the middle of the case where most of the bulky cabling resides isn't ideal, but is understandable. The velcro strips along the edges of the motherboard tray are a helpful upgrade compared to most cases.

The space next to the 5.25 inch bays is occupied by a pair of 2.5 inch drive trays secured using bayonet mounts. The 3.5 inch drive cages below are removable, attached with thumbscrews. While they are solidly built and secure to one another snugly, they aren't physically supported in any way on the sides, making them prone to hard drive vibration.

Next to the drive cages along the floor is a bracket for installing a pump.

All the fans are connected to what Phanteks calls the "PWM hub" which can be controlled via a PWM-supported motherboard fan header using the included 4-pin PWM cable. It's possible to run all five this way but it's dangerous due to the power requirements. According to the manual, the auxiliary molex cable should only be connected if the fan header provides insufficient power but it really should be used no matter what.

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