Fractal Design Define S Black – Windowed ATX Computer Case | FD-CA-DEF-S-BK-W


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 GP14140mm 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 GP14140mm 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 – window version: 8.5 kg
Package dimensions (WxHxD): 322 x 615 x 535mm
Package weight – window version: 10.2 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)or1 – 180 mm fan with 165mm hole spacing (not included)
Bottom: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

10 in stock

SKU: FD-CA-DEF-S-BK-W Categories: ,

Additional information

Weight 13 kg
Dimensions 150 × 150 × 10 cm

Fractal Design

Model No.

FD-CA-DEF-S-BK-W / #15311


13.00 Kg


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.