ASUS Prime AP303 TG Mid-Tower ATX Case - 44L, 360mm GPU
ASUS
ASUS Prime AP303 TG Mid-Tower ATX Case - 44L, 360mm GPU
The ASUS Prime AP303 is a compact 44-liter ATX mid-tower case designed for high-performance builds that need to fit substantial graphics cards, large coolers, and full-power supplies into a smaller footprint. It suits builders who want to maximize component compatibility without sacrificing space efficiency or thermal capacity.
Why this product
Supports graphics cards up to 360mm
Accommodates modern high-end GPUs with an integrated graphics card bracket that reduces sagging on cards between 310mm and 360mm long.
Radiator support up to 360mm
Mounts 360mm radiators on top with 60mm clearance for thicker fans, enabling advanced liquid cooling in a compact chassis.
Fits ATX power supplies up to 180mm
Accepts full-size 1200-watt ATX PSUs, removing the need for modular or compact power units in higher-wattage builds.
Up to seven fans supported
Front, top, and rear mounting locations enable extensive cooling configurations for demanding thermal loads.
USB Type-C front panel
Includes one USB 3.2 Gen 2x2 Type-C port (20Gbps) alongside two USB 3.2 Gen 1 Type-A ports for modern peripheral connectivity.
Available in tempered glass or mesh
Choose a tempered glass side panel for viewing internal components, or a mesh panel for unrestricted airflow and thermal performance.
- Form FactorMid-Tower ATX
- Volume44 liters
- Maximum GPU Length360 mm
- Maximum Radiator Length360 mm
- Maximum PSU Length180 mm
- Weight7.8 kg
- SKUASU-3321
- EAN4711636165068
- Supports Mini-ITX, Micro-ATX, and full ATX motherboards.
- Accommodates CPU coolers up to 165mm tall.
- Houses up to one 2.5"/3.5" combo drive and two 2.5" drives.
- Cable management space is tight at 34mm; consider shorter connectors or careful routing with high-volume cooling setups.
- Does not support ATX power supplies longer than 180mm.
- Graphics cards exceeding 360mm in length will not fit.
Best for
- High-end gaming and workstation builds
- Liquid-cooled systems with 360mm radiators
- Builders seeking compact footprint without power or cooling compromise
- RTX 50 Series and comparable modern GPUs
Trade-offs
- Longer power supplies. Units exceeding 180mm will not fit, ruling out some modular and enthusiast-class PSUs.
- Oversized coolers. CPU cooler height is capped at 165mm, eliminating the tallest aftermarket air coolers.
- Extended storage. Only three drive bays total; NAS or archive builds will need external expansion.
- Cable-heavy builds. 34mm cable management space requires discipline; extensive custom cables may be difficult to route.
The ASUS Prime AP303 is a compact 44-liter ATX case with support for graphics cards up to 360mm long, 360mm radiators up to 60mm thick, and ATX PSUs up to 180mm long.
The AP303 is designed to maximize internal space, enabling installation of graphics cards up to 360mm long, radiators up to 360mm long and ATX power supplies up to 180mm long. 60mm clearance for thicker radiators and fans to enhance cooling. Support for up to 1200-watt ATX power supplies (up to 180mm long). Alongside the graphics card holder is a graphics card bracket that supports GeForce RTX 50 Series graphics cards from 310mm to 360mm long. It securely mounts the graphics card with screws, reducing sagging and movement.
With support for up to 360mm radiators and up to seven fans, the AP303 is primed to deal with the thermal scenarios of high-performance hardware. Metallic quasi-filter mesh panels are designed to enhance airflow and minimize dust ingress, delivering both performance and protection in a sleek style.
The AP303 is available in either black or white, giving you options to create a rig that blends in or stands out. In addition, the tempered glass side panel version provides an elegant appearance, whereas the mesh side panel version boosts airflow efficiency and thermal performance.
General
| Brand | ASUS |
|---|---|
| Motherboard Support | Mini-ITX, Micro-ATX, ATX |
| Expansion Slots | 7 |
Cooling & Airflow
| Top Radiator Support | 360 mm, 280 mm, 240 mm, 140 mm, 120 mm |
|---|---|
| Rear Radiator Support | 120 mm |
| Top Fan Support | 3 x 140 mm or 3 x 120 mm |
| Rear Fan Support | 1 x 120 mm |
| Pre-installed Fans | 1 x 120 mm (rear) |
| Maximum CPU Cooler Height | 165 mm |
| Maximum Radiator Thickness | 60 mm |
Storage & Power
| Drive Bays | 1 x 2.5"/3.5" Combo Bay, 2 x 2.5" Bay |
|---|---|
| Maximum PSU Length | 180 mm |
| Maximum GPU Length | 360 mm |
| Cable Management Space | 34 mm |
Connectivity & Features
| Front USB Type-C | 1 x USB 3.2 Gen 2x2 (20Gbps) |
|---|---|
| Front USB Type-A | 2 x USB 3.2 Gen1 |
| Front Audio | 1 x 3.5mm headphone / Microphone |
| Side Panel Options | Tempered Glass or Mesh |
| Color Options | Black, White |
| Removable Dust Filters | Bottom |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.