Fractal Design
Define S Midi Tower - Black

  • The Fractal Design Define S lends the appearance
  • sound dampening technology
  • and support for a wide variety of components from the widely popular Define Series.

4 In stock

£84.95 *
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Stock Code: CA-028-FD

EAN: 7350041083443


Manufacturer: Fractal Design

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Product information:

Define S Midi Tower - Black

The Fractal Design Define S lends the appearance, sound dampening technology, and support for a wide variety of components from the widely popular Define Series, while introducing a new, innovative internal layout. The Define S case is packed with intelligently designed enthusiast-oriented features delivering a silent case with powerful and expansive air and liquid cooling support, presented in a stunning Scandinavian inspired construction.

The modernized internal layout of the Define S omits the optical drive bays, instead focusing on a clear straight airflow path and uncompromising water cooling support.

The Define S case reaches the highest level of silent computing through strategically placed dense sound-absorbing material, multiple ModuVent™ fan vent covers and finely tuned Dynamic Series fans.

Key features

  • Optimally designed for silent computing, while not compromising on airflow and cooling capabilities 

  • Innovative internal layout, providing a perfectly straight airflow path to the CPU heatsink for air cooling set ups or extensive radiator mounting possibilities for water cooling set ups

  • Extensive water cooling support for a case of this size; housing radiators up to 420mm in the top and 360mm in the front

  • Including smart reservoir brackets; featuring drill-free reservoir mounting on the front of the motherboard tray and pre-drilled pump mounting holes on the bottom panel

  • Equipped with ModuVent™ fan slot covers providing the option of additional cooling or maximum sound absorption

  • Including two Fractal Design Dynamic GP14 140mm fans developed for superlative airflow while still maintaining low noise levels

  • Maintaining a dust-free interior with dust filters that cover the front and bottom air intakes

  • Introducing newly designed hard drive trays placed vertically behind the front partition of the motherboard tray; Three sturdy steel trays with vibration-dampening grommets allowing for installation of one 3.5" or 2.5" drive on each tray, without disrupting the airflow or interfering with the radiator mounting possibilities

  • An additional 2 dedicated steel SSD trays cleanly placed behind the motherboard tray

  • Long motherboard tray extending to the front panel contributing to an extremely clean build, hiding both hard drives and cables

  • Define S model is also available with a large window on the side panel


  • ATX, Micro ATX, Mini ITX motherboard compatibility

  • 7 expansion slots

  • 3 - 3.5" HDD positions (can also accommodate 2.5" units); 2 - 2.5" dedicated SSD/HDD unit positions

  • 9 - Fan positions (2 Fractal Design Dynamic GP14 140mm fans included); 8 fan positions on window model

  • Filtered fan slots in the front and bottom

  • CPU coolers up to 180mm in height

  • ATX PSUs up to 180/170 mm with a bottom 120/140mm fan installed; When not using any bottom fan location longer PSUs up to 300mm can be used

  • Graphics cards up to 425 mm in length with front fans installed, without compromising HDD capacity; Graphics cards up to 450mm in length without front fans installed directly in line with the GPU

  • With a front radiator, maximum graphics card length is reduced by the radiator thickness

  • 20 - 40 mm of space for cable routing behind the motherboard plate

  • Velcro straps included for easy cable management

  • Both side panels feature smart captive thumbscrews so no thumbscrews are lost

  • Colours available: Black

  • Case dimensions (WxHxD): 233 x 451 x 520mm

  • Case dimensions - with feet/screws/protrusions: 233 x 465 x 533mm

  • Net weight: 9.1 kg

  • Package dimensions (WxHxD): 322 x 615 x 535mm

  • Package weight: 10.8 kg

Cooling system

  • Front: 3 – 120/140 mm fans (included is 1 Fractal Design Dynamic GP14 fan, 1000 RPM speed)

  • Rear: 1 – 120/140 mm fan (included is 1 Fractal Design Dynamic GP14 fan, 1000 RPM speed)

  • Top: 3 - 120/140 mm fan (not included) or 1 - 180 mm fan with 165mm hole spacing (not included)

  • Bottom: 1 – 120/140 mm fan (not included)

  • Side: 1 – 120/140 mm fan (not included)

  • Dust filters: Bottom and front intakes

Water cooling compatibility - Radiators

  • Front – 360, 280, 240, 140 and 120 mm radiators of all thicknesses

  • Top – 420, 360, 280, 240, 140 and 120 mm radiators. (A thickness limitation of 55mm for both radiator + fan applies on 420, 280 and 140 mm radiators)

  • Bottom – 120 mm radiator (Use of radiators in the bottom position limits the PSU length to 165 mm)

  • Rear – 120 or 140 mm radiator

Water cooling compatibility - Pumps

  • Pre-drilled holes on the bottom panel, supports many DDC and D5 variants

Water cooling compatibility - Reservoirs

  • Adjustable mounting brackets allow for almost any rectangular mounting screw pattern

  • Maximum distance between the mounting bracket screw positions: 350mm height / 80mm width

Front interface

  • 2 USB 3.0

  • Audio in/out

  • Power button with LED (blue)

  • HDD activity LED (blue)

  • Reset button

Package contents

  • Define S computer case

  • User manual

  • Accessory box

Additional information

  • EAN/GTIN-13: 7350041083443

  • UPC: 817301013444

  • Product code: FD-CA-DEF-S-BK


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Customer review

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Star Rating

Average customer rating

(from 4 customer reviews)
Last 6 Months (1)
All Time (4)

Nice case, good cooling and well thought out.

Perfect if you're looking for something quite discrete. Well thought out, only gripe is a filter is needed for the top vents. 140mm fans - can fit three at the front, three on the roof, one at the rear and one on the floor near the PSU. I'm running with 6 and am maintaining very good temperatures with them at 6/700rpm, it's all nice and quiet. Good cable routing, well thought out 2.5/3.5" storage options. There's nothing to dislike in all honesty!

hodorhodor 2020-03-09

Beautiful, Minimal and Rock Solid

Having a strong dislike of the loud, garish "Gaming" designs on seemingly every PC part these days, Fractal seemed like the only choice. The case is sturdy (read: heavy) with thick panels which do a great job dampening noise and there's plenty of space for cooling, with space behind the motherboard for cable management and HDD mounting. Everything fits together perfectly and feels well designed, although the vertical hard drive mounts behind the motherboard instead of the usual cage may not be for everyone. An easy 5 stars.

lairdisonfire 2018-05-07

Perfect basic case

This is a fantastic case
I personally love it

Followed by my critics
The 3 hard drive on the back have no active cooling
The case accepts only standard ATX format for the motherboard
No extended format at all

Bot for the price it deserves 5 stars

Anton 2017-06-08

excellent Case

David Malcolm 2016-02-05

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Awards & Media Coverage

  • eTeknix - Editor's Choice

    “Fractal Desing have really made something special here. From the exterior, it’s as stylish and bold as any other Fractal Design chassis, but the interior is a breath of fresh air. If your next build is going to feature high-end water cooling, this is the perfect chassis for the job.”

  • Vortez - Gold

    "The Define S is another triumph for Fractal Design. This stylish chassis supplies every possible need for water cooling advocates and does so while delivering some interesting and innovative features – stepping away from mundane case design."

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