Room to build big. Airflow to keep it cool.

The Xigmatek Osiris is a full-size case designed for gamers who don’t want to compromise on components. Whether you’re running a compact Mini-ITX board or a full E-ATX powerhouse, the Osiris adapts — with dedicated back-plug support for ATX and Micro-ATX boards for a cleaner cable routing job.

Space for flagship hardware
With up to 400mm of GPU clearance (285mm if you’re running a fan on the motherboard panel) and 180mm of CPU cooler headroom, the Osiris handles today’s largest graphics cards and air coolers without a squeeze. One of our customers confirmed it firsthand — fitting an RTX 5080 with room to spare.

Cooling built in, not bolted on
Airflow is where the Osiris earns its keep: up to three 140mm fans up front, three more on top, plus rear and PSU shroud mounting. Serious about liquid cooling? It supports 360mm radiators on both the front and top, so a full custom loop or large AIO is no problem.

Storage & expansion
Two 3.5″ HDD bays plus dual 2.5″ SSD brackets give you flexible storage options, while 7 expansion slots — including 90-degree vertical GPU mounting — let you show off your graphics card through a side panel.

Solid, practical build
Full steel construction keeps things sturdy, with a standard PS2 ATX PSU bay (220mm max length) and a front I/O panel with USB 3.0, USB 2.0, and HD audio for quick access.

Specs at a glance

• Dimensions: 465 x 238 x 481mm (L x W x H)
• Motherboard support: E-ATX, ATX, Micro-ATX (back plug), Mini-ITX
• GPU clearance: up to 400mm
• CPU cooler clearance: 180mm
• Radiator support: 360mm (front & top), 120mm (rear)
• Material: Steel

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