Define One Light Solid Closed-Front PC Gaming Case - Sound-Dampened Solid Panels - Three Momentum Fans Included - ATX Reverse Connector and E-ATX/ATX/mATX/ITX Standard Motherboard Support
About this item
Define One is a closed-front ATX PC case combining clean Scandinavian design with quiet gaming capability and everyday usability. It features aluminum side intake vents, subtle architectural curvature, and premium details for a refined visual expression shaped around timeless, functional design. With support for modern high-end components, it comes equipped with three powerful Momentum fans, space for graphics cards up to 368 mm in length, support for radiators up to 360 mm in the front and 280 mm in the top, and compatibility with rear-connector motherboards. With removable brackets and integrated cable routing features, Define One delivers a smooth and intuitive building experience.
- Features
- Closed-front design with sound-dampening bitumen
- Minimalist expression with aluminum side intake vents
- Includes three pre-installed LCP-blade Momentum fans
- Supports graphics cards up to 368 mm in length
- Compatible with 360 mm front and 280 mm top radiators
- Front air guide directs airflow toward the graphics card
- Tool-less access and removable top and front fan brackets
- Cable straps, aligners, and grommet for neat routing
- Supports E-ATX and reverse connector motherboards
- Front I/O with USB-C, two USB-A ports, and audio jack
Specifications
- Brand
Fractal Design
- Series
Define
- Model
FD-C-DEFOA-04
- Type
ATX Mid Tower
- Color
Light
- Case Material
Industrial sound-damped steel
- With Power Supply
No
- PSU Mount
Bottom
- Motherboard Compatibility
ATX / E-ATX / ITX / Micro ATX
- Side Panel
without Side Window
- Dust Filters
Front panel intakes, PSU
- Internal 3.5" Drive Bays
2
- Internal 2.5" Drive Bays
2 (up to six total)
- Expansion Slots
7
- Front Ports
1 x USB Type-C 20 Gbps, 2 x USB Type-A 5 Gbps, 1 x Audio Combo Port, Power button
- Fan Options
Total fan mounts: 6 x 120 mm or 5 x 140 mm Front: 3 x 120/140 mm (3 x 140 mm Momentum included) Top: 2 x 120 or 2 x 140 mm Rear: 1 x 120 mm
- Pre-installed Fans
Front - 3 x 140mm
- Radiator Options
Front - Up to 360mm / Rear - Up to 120mm / Top - Up to 280mm
- Max GPU Length
368 mm (338 mm with a 30 mm-thick radiator mounted)
- Max CPU Cooler Height
171 mm
- Max PSU Length
180 mm
- Dimensions
500 x 235 x 482mm
- Weight
11.3kg
- Features
Closed-front design balancing cooling capability with a timeless, refined exterior finish Minimalist expression with subtle curvature and fine-patterned aluminum side intake vents Includes three pre-installed LCP-blade Momentum fans for quieter, powerful performance Space for graphics cards up to 368 mm in length and includes an adjustable support bracket Compatible with front-mounted radiators up to 360 mm and top-mounted up to 280 mm Features an integrated front air guide that helps direct airflow toward the graphics card Offers a smooth build experience with tool-less access and removable top and front fan brackets Includes adjustable cable straps, aligners, and a routing grommet for a neatly finished build Supports E-ATX motherboards up to 277 mm and reverse connector motherboards up to ATX Enjoy a quieter gaming experience with bitumen-lined panels and airflow engineering Accessible front I/O includes a USB Type-C port, two USB Type-A ports, and an audio jack
- Package Content
Computer case Accessory box Product manual
- First Listed on Newegg
September 02, 2026