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Phanteks - ECLIPSE P400S ATX Mid Tower Case

( 4.7 Average / 3 Ratings )






Part #





ATX Mid Tower

Includes Power Supply


Internal 2.5" Bays


Internal 3.5" Bays


Motherboard Compatibility

ATX, EATX, Micro ATX, Mini ITX

Front Panel USB 3.0 Ports


Maximum Video Card Length

280 mm / 11.024" With Drive Cages
395 mm / 15.551" Without Drive Cages

Completed Builds Using This Part

See All Completed Builds


Merchant Base Promo Shipping Tax Availability Total
Bytes At Work €84.00 +€6.95 s/h €90.95

Price History (Excluding Tax) History:


TraskIncarnate 18 points 32 months ago
from completed build Room to Grow


  • Great construction materials and build quality at price point
  • Well thought out, flexible layout (mostly) with decent cable management
  • Integrated fan and LED controls
  • All-rear-mounted SSD/HDD setup makes for a clean build
  • Inluded 120mm fans are relatively quiet
  • Dark metallic gray (Anthracite Gray) finish is gorgeous


  • That gorgeous finish picks up prints and scratches far too easily
  • There are only two 120mm fans included (1 front intake, 1 rear exhaust), which with a CPU cooler gives you negative case pressure out-of-the-box
  • There is no clearance at all for top-mount radiators (or even some 140mm fans)

This is a great budget mid-tower. The basement, all-rear-mounted SSD/HDD setup, grommeted pass-throughs, and built-in velcro cable ties make for a really clean build, with room for whatever hardware configuration you can imagine throwing at a mid-level rig (air, AIO, or custom liquid cooled). The sound dampening materials, integrated fan controller, and PSU isolation allow for good thermal performance at near silence when built with acoustic-optimized hardware. Nearly perfect…


I find it hard to believe that, even at this price point, Phanteks couldn’t have included 3 fans (2 front intake, 1 rear exhaust) for out-of-the-box positive case pressure. And while they were at it, those 3 fans could all have been their own outstanding PH-F120SP models, which offer superior airflow, quieter operation, and rubber grommets at the corner mounting points to avoid transferring vibration through the chassis.

I don’t install radiators at all in my personal rigs, but it would be nice to offer top-mounted radiators on customer builds. That’s just not an option in this case. There is NO clearance up top for anything more than the 4/8-pin EPS connector, or maybe 120/140mm fans on their own.

And a true powder coat would eliminate the ease with which the exterior finish picks up prints and scratches. In fact, if memory serves, Phanteks already learned this lesson and then (quickly) implemented the solution on their Evolv series. Seems an egregious oversight to repeat the mistake.

It’s still a great budget case, in fact it’s probably my favorite sub-$100 mid-tower, “silent” or otherwise. And with a little attention to its (admittedly few) shortcomings, it could be an absolutely perfect budget enclosure for quiet IT or content creation workstations.

NovaicWarehouse 8 points 27 months ago
from completed build Monolith

Beautiful case. Very user-friendly (as a first-time builder I am very thankful for this), and it is very quiet..

darchon 13 points 26 months ago

Arguably one of the best bang-for-the-buck budget gaming cases. The sound dampening helps as does the design to hide airflow noise, but as a result, air intake from the front is restricted - but, you can stack up 3 120mm fans in the front to help. Solid build quality all around, dust filters everywhere, and a nice built-in fan controller (up to 3 3-pin fans) & rgb lighting strip.