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Fractal Design Define One Dark TG Closed-Front PC Gaming Case - Tempered Glass Side Panel - Three Momentum Fans Included - ATX Reverse Connector and E-ATX/ATX/mATX/ITX Standard Motherboard Support
- 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
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Overview
Specs
Reviews (1)
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.
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 2 years
- Limited Warranty period (labor): 2 years
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- Website: https://support.fractal-design.com/support/home
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
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The Fractal Design Define One Dark TG is a quiet-focused ATX mid-tower PC case for gamers and performance builders who want sound-dampened construction, three included 140 mm Momentum fans, support for GPUs up to 368 mm, and front radiators up to 360 mm.
Recommended For
- Quiet-focused gamers and home-office users who want a restrained PC design, sound-dampened panels, and lower perceived system noise without giving up support for a full-size graphics card.
- Builders assembling gaming or productivity PCs with large GPUs, ATX or E-ATX motherboards, and either air cooling or a front-mounted liquid cooler up to 360 mm.
- First-time or occasional PC builders who value a straightforward installation process, removable fan brackets, tool-less access, and built-in cable-routing features.
- Users who want usable out-of-the-box airflow and do not want to purchase front intake fans separately, since the case includes three 140 mm Momentum fans.
Real-World Use Scenarios
- A user builds a gaming and work PC for a bedroom or shared office and wants less fan noise during everyday use. The closed front and sound-dampening panels reduce the amount of system noise escaping, while the three included 140 mm fans provide adequate cooling without requiring immediate fan upgrades.
- A user installs a mid-range or high-end gaming system and wants strong graphics-card cooling without using an open-mesh case. The front air guide and three front Momentum fans direct intake air toward the GPU, so sustained gaming should remain well controlled, although the closed-front layout may not match the lowest temperatures of a dedicated airflow-focused case.
- A builder assembles or rebuilds an ATX PC and wants the installation process to be straightforward. The removable top and front fan brackets, tool-less panel access, cable-routing space, straps, and grommets make it easier to install components and finish with a clean-looking interior.
- A user is building a workstation or gaming PC with liquid cooling and wants room to choose between radiator positions. The case can support a front-mounted radiator up to 360 mm or a top-mounted radiator up to 280 mm, but users should plan component clearances carefully because the top does not support a 360 mm radiator.
- A user wants a PC that fits a professional home-office or living-room setup rather than an RGB-focused gaming aesthetic. The dark, rounded exterior and tinted tempered-glass side panel let the system blend into the room while still allowing the components to be seen.
- A user is upgrading to a large graphics card or a reverse-connector motherboard and wants to reuse the case for different platform layouts. The support bracket, E-ATX and ATX compatibility, and reverse-connector support make the case suitable for varied builds, but GPU length should be rechecked if a thick front radiator is installed.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | ATX and E-ATX PC builds that need a sound-dampened mid-tower chassis, multiple storage bays, three included 140 mm fans, and support for large graphics cards and liquid-cooling radiators |
| Chassis Design And Compatibility | Dark ATX mid-tower case with industrial sound-damped steel construction, a tempered glass side panel, and support for ATX, E-ATX, Micro ATX, ITX, and compatible reverse-connector motherboards |
| Cooling And Radiator Support | Supports up to six 120 mm or five 140 mm fans, with three pre-installed 140 mm Momentum fans at the front; radiator support includes up to 360 mm in front, 280 mm on top, and 120 mm at the rear |
| Component Clearance | Fits graphics cards up to 368 mm long, or 338 mm with a 30 mm-thick front radiator, CPU coolers up to 171 mm tall, and power supplies up to 180 mm long |
| Storage And Expansion | Provides two internal 3.5-inch drive bays and two internal 2.5-inch bays, expandable to six total 2.5-inch drives, along with seven expansion slots |
| Front I/O And Dust Protection | Front I/O includes one USB-C 20 Gbps port, two USB-A 5 Gbps ports, an audio combo port, and a power button; front intake and PSU dust filters help protect the airflow paths |
| Build And Cable Management Features | Closed-front design with aluminum side intake vents, an integrated front air guide, tool-less access, removable top and front fan brackets, and adjustable cable straps, aligners, and routing grommets |
| Power Supply Configuration | Power supply is not included and installs at the bottom of the case |
| Dimensions And Weight | Measures 500 x 235 x 482 mm and weighs 11.1 kg |
| Model Identifiers | Fractal Design Define series, model FD-C-DEFOA-02 |
Reference Q&A
Q: Should I choose the Fractal Design Define One or Meshify 2 for a high-end gaming PC?
A: Choose the Define One when lower noise, sound-dampening panels, and a cleaner closed-front design matter alongside cooling. Choose the Meshify 2 when maximum open-air airflow, extensive fan expansion, and high-TDP component cooling are the priority. The Define One includes three 140 mm fans and uses a front air guide to direct intake toward the graphics card, while the Meshify 2 is built around a more open mesh front and a larger, highly configurable interior.
Q: Is the Fractal Design Define One a better upgrade than the older Define 7?
A: Choose the Define One for a newer, more compact quiet-build design with three included 140 mm Momentum fans, a GPU-focused front air guide, USB-C connectivity, and support for reverse-connector motherboards. Choose the Define 7 when you need substantially more storage capacity, larger graphics-card clearance, more fan and radiator positions, or its dual-layout interior. The Define 7 supports up to 470 mm graphics cards, up to 14 hard drives in its storage layout, and up to nine fans, while the Define One supports graphics cards up to 368 mm and up to six 2.5-inch drives.
Q: Should I buy the Define One or the smaller Define 7 Compact?
A: Choose the Define 7 Compact when desk space and lower case volume are more important than expansion room. Choose the Define One when you want a roomier ATX build with E-ATX support, up to 368 mm of GPU clearance, a 171 mm CPU-cooler limit, three included 140 mm fans, and top radiator support up to 280 mm. The Define 7 Compact is physically smaller, but its reduced dimensions also provide less internal clearance and fewer expansion options.
Q: Is the Fractal Design Define One better for quiet work and gaming than an airflow-focused case?
A: The Define One is the better fit for mixed gaming, office, and content-creation use where acoustic control is important. Its closed front, bitumen-lined panels, and included Momentum fans are designed to reduce perceived noise, while testing found it maintained strong GPU temperatures through its front air guide. A mesh-front case remains the more suitable choice for unrestricted airflow, sustained maximum-power workloads, or users who plan to add many high-speed fans.
Q: Will this case fit a large graphics card and a front-mounted radiator at the same time?
A: Yes. The case supports graphics cards up to 368 mm long without a front radiator, or up to 338 mm with a 30 mm-thick front radiator installed. Check the exact GPU length and radiator thickness before building.
Q: What cooling options does this case support, and are fans included?
A: It includes three pre-installed 140 mm Momentum front fans. The case supports up to six total fans: three 120/140 mm fans in front, two 120/140 mm fans on top, and one 120 mm rear fan. Radiator support includes up to 360 mm in front, 280 mm on top, and 120 mm at the rear.
Q: Which motherboard sizes are compatible with this case?
A: The case supports E-ATX motherboards up to 277 mm wide, as well as standard ATX, Micro-ATX, and Mini-ITX boards. It also supports reverse-connector motherboards up to ATX size.
Q: Is this a complete gaming PC, or does it only include the case and fans?
A: It is only a computer case. The package includes the case, accessory box, and product manual. It does not include a power supply, motherboard, processor, memory, storage, graphics card, or CPU cooler.
Q: Is this case suitable for a quiet gaming PC with good cable management?
A: It is designed for quieter operation through bitumen-lined sound-dampening panels, while aluminum side vents and a front air guide provide intake airflow toward the graphics card. It also includes cable straps, aligners, and a routing grommet. The closed front favors reduced noise and a cleaner exterior over the maximum open-air intake of a fully mesh-front design.
Q: Is the Define One a replacement for the Define 7?
A: No. Fractal Design positions the Define One as an addition to the Define family, not a replacement for the Define 7 or Define 7 XL. Choose the Define One for its closed-front design, included 140 mm fans, and newer reverse-connector support; choose the Define 7 line if you need its different expansion or storage features.
Q: Does the closed front restrict airflow too much?
A: The closed front is a trade-off rather than an automatic limitation. Air enters through the aluminum side vents, and the integrated front air guide directs airflow toward the graphics card. The case includes three front 140 mm Momentum fans, but users prioritizing maximum open-air airflow may prefer a mesh-front case.
Q: Is the Define One suitable for a modern high-end gaming PC?
A: It is suitable for most high-end ATX gaming builds if component dimensions fit. The case supports graphics cards up to 368 mm, CPU coolers up to 171 mm, front radiators up to 360 mm, and top radiators up to 280 mm. A front-mounted 30 mm-thick radiator reduces maximum GPU length to 338 mm, so the GPU and radiator should be checked together.
Q: Is it a good choice for users who need many hard drives or a 5.25-inch bay?
A: No. The Define One provides two 3.5-inch bays and two 2.5-inch bays, with up to six total drive positions, but it has no 5.25-inch external bay. Users building a large storage server or requiring optical-drive support should consider a case designed specifically for those needs.
Q: Is the Define One worth buying over a cheaper ATX case?
A: It is most defensible when you value included premium fans, sound-dampened panels, tool-less access, cable-management hardware, and support for large radiators or reverse-connector motherboards. A cheaper mesh-front case may offer similar basic component compatibility and potentially better airflow per dollar, but may not include the same noise-control or convenience features.