MSI MAG FORGE 321R AIRFLOW Mid-Tower Case — ATX/mATX/ITX Support, Tempered Glass, 4x 120mm ARGB Fans (3 Front, 1 Rear), USB-C 3.2 Gen2x2, 2x USB 3.2 Gen1, GPU 390mm, CPU Cooler 160mm, 360mm Radiator Support, 7 Expansion Slots

The MSI MAG FORGE 321R AIRFLOW is a mid-tower case designed for high-performance builds , strong airflow , and modern connectivity . It supports ATX, Micro-ATX, and Mini-ITX motherboards , making it ideal for gaming rigs , content creation systems , and workstations that require spacious internal layout and efficient thermal management .

With 4 pre-installed 120mm ARGB fans , tempered glass side panel , and mesh front panel , this case offers excellent cooling potential and aesthetic appeal for RGB enthusiasts . The USB 3.2 Gen 2x2 Type-C port ensures fast data transfer and device charging , while the removable drive cage adds flexibility for storage configurations.

Case Design & Dimensions

• Dimensions:
  • Depth: ~472.5 mm
  • Width: ~210 mm
  • Height: ~498 mm
  • Overall size: ~18.6 x 8.3 x 19.6 inches
• Weight:
  • Net weight: ~7.05 kg
  • Gross weight: ~9.2 kg (with accessories)
• Material:
  • Combination of steel and plastic for durability and aesthetics
  • Tempered glass side panel (3mm thick) for component visibility
  • Mesh front panel for enhanced airflow and cooling efficiency
• Color Options:
  • Sleek black design with RGB lighting support
  • Modern look suitable for gaming and professional builds

Motherboard Support

• Supported Form Factors:
  • ATX (305 x 330 mm)
  • Micro-ATX (244 x 244 mm)
  • Mini-ITX (170 x 170 mm)
• Back-Connect Motherboard Support:
  • Supports back-connect designs for cleaner cable management
  • Offers flexible build options for large E-ATX boards
• Mounting Holes:
  • Multiple mounting points for secure motherboard installation
  • Supports standard and back-connect designs for versatile use

Expansion Slots

• Number of Slots: 7 full-height expansion slots – accommodates multiple GPUs, sound cards, and PCIe devices
• Compatibility:
  • Dual-slot GPUs and multi-GPU setups supported
  • Suitable for high-end graphics cards and additional peripherals

GPU Support

• Maximum GPU Length: Up to 390 mm (15.35 inches) – ideal for long, high-end GPUs like RTX 5000 series or RX 9000 series
• Fan Mounting:
  • Front: 3 x 120mm / 3 x 140mm
  • Top: 3 x 120mm / 2 x 140mm
  • Rear: 1 x 120mm
  • Side: 2 x 120mm / 2 x 140mm
• Cooling Flexibility:
  • Supports push-pull fan configurations
  • Magnetic dust filters on top and side panels for dust resistance

CPU Cooler Support

• Max CPU Cooler Height: 160 mm (6.29 inches) – suitable for tall air coolers and AIO liquid coolers
• Clearance:
  • Ample space for large tower coolers
  • Compatible with 240mm AIO coolers
• VRM Clearance:
  • Spacious interior for high-end VRMs and heat sinks
  • Good airflow around CPU and GPU for thermal efficiency

Storage & Drive Bays

• Drive Bays:
  • 1 x 2.5” SSD mount
  • 2 x hybrid 2.5”/3.5” bays (removable HDD cage)
• M.2 Support:
  • Multiple M.2 slots on motherboard and inside the case
  • Supports NVMe SSDs for fast boot times and data access
• Radiator Support:
  • Top: 360mm radiators
  • Front/Bottom/Rear: 120/140/240/280 mm radiators
  • Excellent for liquid cooling and custom water loops

Power Supply Support

• PSU Compatibility: Standard ATX power supplies
• Max PSU Length: 200 mm – fits most standard and modular PSUs
• PSU Placement: Bottom-mounted for optimized airflow and cable management
• Cable Management:
  • Internal routing channels for neat and organized builds
  • Spacious interior for easy installation

I/O Panel & Connectivity

• Front I/O Ports:
  • 1 x USB 3.2 Gen2x2 Type-C (20 Gbps) – fast data transfer and device charging
  • 2 x USB 3.2 Gen1 Type-A (5 Gbps) – for peripherals and storage
  • 1 x audio jack (mic-in / line-out)
  • LED switch, Power, and Reset buttons for convenient control
• Back I/O Panel:
  • HDMI, DisplayPort, Ethernet, and audio jacks
  • USB 3.2 Gen1 ports for additional connectivity
• USB-C Port:
  • 20 Gbps speed – ideal for external drives, displays, and peripherals
  • Supports USB 3.2 Gen2x2 for high-speed data transfers

Cooling Features

• Pre-Installed Fans:
  • 4 x 120mm ARGB PWM fans (3 front, 1 rear)
  • Support for up to 11 total fans – allows for custom cooling setups
• Fan Control:
  • ARGB fan headers for lighting synchronization
  • MSI Mystic Light software for RGB customization
• Dust Filters:
  • Magnetic top and side filters for reduced dust accumulation
  • Easy to remove and clean
• Airflow Optimization:
  • Balanced intake/exhaust design for efficient heat dissipation
  • Ideal for overclocking and high-end components

Design & Build Quality

• Tempered Glass Side Panel:
  • 3mm thickness for sturdiness and visual appeal
  • Allows for showcasing RGB lighting and custom builds
• Mesh Front Panel:
  • Enhances airflow and cooling
  • Keeps internal temperatures low under load
• Build Material:
  • Steel and plastic construction for durability and aesthetics
  • Reinforced structure for long-term reliability
• Cable Management:
  • Integrated cable routing and internal compartments
  • Pre-mounted I/O shield for quick setup

Special Features

• ARGB Fan Control Board:
  • Supports up to 11 fans – customizable lighting and performance
  • Compatible with MSI Mystic Light software for RGB synchronization
• Removable Drive Cage:
  • Provides flexible storage configuration
  • Allows for easier access to drives and components
• Thermal Efficiency:
  • Optimized for heat dissipation and stable performance under load
  • Ideal for high-end builds with long GPUs and tall coolers
• Compatibility with High-End Components:
  • 390mm GPU length and 160mm CPU cooler height – perfect for next-gen hardware