Seasonic Arch Q503 chassis + Connect PSU review

PC Cases and Modding 223 Page 2 of 15 Published by


Specification and features

Specification and features


Some marketing info first:

“The Seasonic ARCH Q503 with the integrated CONNECT power supply is a mid-tower ATX chassis with a sturdy steel body and tempered glass panels on both sides. The Seasonic ARCH Series creates an interplay and connection between two essential pillars or product group integration; the Seasonic CONNECT Module and the Seasonic SYNCRO Q70 Case. Timeless appearance, modern design, and user-friendly functions make this case a logical choice for users, who want convenience, easy assembly, and hassle-free cable management with the Seasonic CONNECT.

The Seasonic ARCH Q503 with the integrated CONNECT power supply is a mid-tower ATX chassis with a sturdy steel body and tempered glass panels on both sides. This cutting-edge chassis greatly simplifies system building and cable routing to create an unmatched user experience. The removable glass panels make it easy to install the components while offering a clear view of the system configuration. The Seasonic CONNECT Module is, in essence, a cable management hub to which the components are directly connected with generally shorter cables. This new way of power supply integration significantly improves ventilation and the system’s look by reducing cable clutter.

The high-quality power supply is 80 PLUS Gold efficiency rated with well-known, top-level Seasonic functions, features, and quiet operation. The fan control button at the back of the power supply allows users to customize their cooling needs by selecting between two stands: S2FC (fan control without Fanless Mode) and S3FC (fan control including Fanless Mode).

There are ample options for storage and cooling configurations. Three fans are pre-installed in the front and back of the case, providing optimal airflow. For extended options, the case can be outfitted with up to eight 120 mm cooling fans and various liquid cooling solutions.




•             Compatibility with Seasonic CONNECT for ultimate cable management
•             Stylish tempered glass side panels on both sides
•             Sturdy steel plate (0.7 mm) construction for durability and noise dampening
•             Preinstalled 120 mm fans (two in the front and one in the back)
•             Captive thumb screws to prevent them from getting lost
•             Easy access to control buttons and connectors (USB Type-C included)



Case Type

(E-)ATX Case

Motherboard Support

Mini-ITX / mATX / ATX / E-ATX (up to 277 mm)


448 x 215 x 482 mm (L x W x H)

Front I/O Ports

USB3.0 x2

USB3.1 Type-C x1

Audio x1

Internal 5.25” Bays


Internal 3.5/2.5” Bays


Internal 2.5” Bays


Expansion Slots


Max PSU Length

230 mm (but Connect 750 W is included)

Max CPU Cooler Height

165 mm

Max GPU Length

380 mm

Radiator Support

Front: up to 360 mm

Top: up to 280 mm

Rear: 120 mm

Fans (total)

Front: 120 mm x3 / 140 mm x2 (2 x 120 mm Pre-installed)

Top: 120/140 mm x 2

Rear: 120 mm x1 (Pre-installed)

Let’s head to the unboxing part.

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