ASUS Announces Prime AP303 Compact Mid-Tower ATX Case
Space-efficient 44-liter chassis makes room for massive graphics cards and radiators
- Compact size with maximal capacity: 44-liter case supports graphics cards up to 360mm long, 360mm radiators up to 60mm thick, PSUs up to 180mm long
- Enhanced rigidity for graphics cards: Bracket supports NVIDIA® GeForce RTX™ 50 Series graphics cards 310–360mm long, reducing sag or movement
- Power cable for high-end systems: UL-certified power cable delivers 15 amps to ensure stable operation
TAIPEI, Taiwan, November 7, 2025 — ASUS today announced the Prime AP303, a 44-liter mid-tower ATX case that gives users the space needed for high-end components, with multiple side panel and color options. The case's user-friendly features and cooling optimizations provide a compact frame with massive potential.
Compact size with max capacity
The ASUS Prime AP303 uses every square inch smartly, providing room for ATX PSUs up to 180mm long and graphics cards up to 360mm long. The case’s graphics card bracket is built to support the heft of GeForce RTX™ 50 Series graphics cards measuring between 310mm to 360mm long — up to and including heavyweight cards like the ROG Astral GeForce RTX 5090. This ensures long-term hardware stability — even for graphics cards with large heatsinks for premium thermal performance. In addition, the Prime AP303 ensures stable power via a UL-certified internal power cable, which delivers 15 amps of current to the front-mounted power supply. For easy cable management, the AP303 also offers a 34mm-wide compartment behind the motherboard.
Capable, compact cooling
Beyond the room the AP303 reserves for PSUs and large graphics cards, it can also fit a radiator up to 360mm long and up to 60mm thick — which makes connecting CPU power cables to the top edge of the motherboard a breeze. Factor in the seven mounting points for fans, and this case is primed to keep high-performance hardware at its coolest.
The AP303 also uses a quasi-filter metallic mesh throughout its design. This square mesh offers heightened airflow intake, giving internal components plenty of access to fresh air. All versions of the AP303 feature mesh elements, so no matter which chassis configuration users opt for, their rig will benefit from capable cooling.
Tool-free side panels, classic color options
Users can choose between tempered glass or quasi-filtered metallic mesh for the side panels. Tempered glass provides a clean look at a rig’s internal components — perfect for RGB enthusiasts who love to glow up their desktops with radiant hardware. Those who opt for the metallic mesh side panel can maintain a low profile while maximizing airflow. Both side-panel types feature tool-free designs, meaning users can easily remove and attach the panels.
The AP303 is available in black or white, and the interior cables are color-matched for a cohesive aesthetic. Whether users want a stealthy black rig that blends in with their other electronics, or a centerpiece for their Moonlight White battlestation, the AP303 is ready to suit.
Connectivity users need
The AP303 features a USB 20Gbps Type-C® port on the front panel — a location that keeps it readily accessible as the chassis rests on top of a desk. Users can pair this chassis with a motherboard equipped with a USB 20Gbps connector to reap the benefits of speedy data transfers. The AP303 also features two front-panel USB Type-A ports, as well as headphone and microphone jacks. With all these connectivity options at the front of a rig, swapping out gear is an effortless experience.
