Phobya UltraBig Watercase V.1 Black Edition
Best modular chassis for custom water-cooling enthusiasts and PC builders.
The Phobya UltraBig Watercase V.1 Black Edition is a premium, fully modular enclosure built for the ultimate water-cooling experience. Crafted from robust 1.5mm thick steel with a sleek black powder-coated finish, it offers unparalleled customization for builders and modders. Its spacious interior supports large motherboards and graphics cards, making it ideal for high-performance custom builds. The screw-based assembly system ensures a clean aesthetic and user-friendly building process, while optimized features cater to extensive water-cooling setups, including multiple radiator mounts and integrated pump/reservoir support.
$279.95
Owner Satisfaction
4.7
/ 5
Category Rank
14
/ 898
#14 in Desktop Computer Cases
Price vs Category Average
-56%
Below average
Material
Steel
/ Steel
Who it's for
- Extreme overclockers needing massive thermal dissipation capacity
- Custom loop builders requiring easy maintenance and component access
- System builders prioritizing structural integrity for heavy liquid cooling setups
Who should skip it
- Users with limited floor space or standard desk setups
- Budget-conscious builders avoiding high-end custom cooling investments
- People who frequently relocate or transport their computer systems
Performance breakdown
Water-cooling capacity
Unmatched radiator support handles the most complex custom liquid loops.
Build flexibility
Modular design allows for extensive hardware customization and component placement.
Structural integrity
Heavy-duty steel construction provides a rock-solid foundation for massive builds.
Hardware compatibility
Spacious interior accommodates oversized motherboards and long high-end graphics cards.
Assembly experience
Screw-based modularity is precise but requires patience for full assembly.
Storage capacity
Massive drive bay count supports extensive multi-disk storage configurations.
Key Specs
Material
Steel
Color
Black powder coated
Dimensions (LxWxH)
585 x 243 x 760mm
Weight
22000g
Mainboard compatibility
ATX, mATX, eATX, µATX, SR-2 boards
Graphics card length
up to 400mm, up to 580mm after removal of HDD slots
Drive bays
5x 5.25 inch, 9x 3.5 inch HDD
PSU slots
3, two with faceplate and 80mm fan mounting possibility, length up to 400mm
Features
- Revolutionary modular design for ultimate customization
- Optimized for extensive water cooling setups
- Robust steel construction for durability
- Supports large motherboards and graphics cards
- Clean, modder-friendly assembly with M4 screws
- Multiple radiator mounting options
- Integrated pump and reservoir support
- Easy assembly with hexagonal socket screws
What customers say
Enthusiasts highly value this case as a premier platform for ambitious water cooling. The core satisfaction stems from its unparalleled capacity, easily supporting multiple massive radiators without restricting airflow or access. Reviewers consistently praise its robust, tank-like build quality, confirming its durability and stability for heavy components. While its substantial size presents challenges for handling, users accept this trade-off for the superior cooling potential. The case is viewed as a long-term investment, providing the ultimate foundation for showcase liquid cooled systems due to its exceptional size and customization options.
Know before you buy
The UltraBig Watercase is designed specifically for extensive custom loops. It features dedicated mounting points for pumps and reservoirs, along with multiple locations to install large radiators, making it ideal for high-end cooling configurations.
Yes, the case supports graphics cards up to 400mm in length. If you need even more space, you can remove the HDD slots to extend that clearance up to 580mm.
Yes, the interior is spacious enough to support a wide range of motherboard form factors, including ATX, Micro ATX, Mini ITX, E-ATX, and even specialized SR-2 boards.
The case uses a screw-based assembly system with hexagonal socket screws, which provides a very sturdy build. While it is highly modular and offers great customization, the assembly is straightforward for anyone comfortable with a screwdriver.
Yes, the case includes three PSU slots. Two of these slots come with faceplates and offer the option to mount 80mm fans for additional airflow.
The case is built from robust 1.5mm thick steel, giving it a solid, premium feel. It weighs 22kg, reflecting its heavy-duty construction and stability.
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$280