MSI MAG A1250GL PCIE5 power supply unit 1250 W 24-pin ATX ATX Black

The MSI MAG A1250GL PCIE5 1250 W is an ATX power supply designed for high-performance gaming and workstation builds. It delivers up to 1250 W of continuous power with a single-rail design and includes native PCIe CEM 5.1 support to supply up to 600 W to compatible 16-pin graphics cards. The unit is 80 PLUS Gold certified for increased energy efficiency and features a 135 mm fan with fluid dynamic bearing for balanced cooling and low noise. Modular cabling and a dedicated storage solution for unused cables reduce clutter and simplify installation.

Advantages

The power supply supports ATX 3.1 and can handle up to 2x total power excursion and 3x GPU power excursion for stable operation with modern high-performance GPUs. With a native PCIe CEM 5.1 16-pin connector it can provide up to 600 W to compatible graphics cards. The dual-color 16-pin cable makes it easier to confirm proper seating of the connector. A half-bridge LLC + SR + DC/DC topology ensures stable voltages, high conversion efficiency, and rapid voltage response. The 80 PLUS Gold certification reduces energy consumption compared with lower-rated units.

Suitable for

• High-end gaming PCs with NVIDIA GeForce RTX 40 Series GPUs using PCIe CEM 5.1 (16-pin) connectors
• Workstations and content-creation rigs requiring up to 1250 W continuous power
• System builders seeking modular cabling and reduced cable clutter

Key specifications

• Total power: 1250 W
• Efficiency: 80 PLUS Gold (approx. 90% efficiency)
• Form factor: ATX (ATX 3.1 ready)
• PCIe connector: Native PCIe CEM 5.1 16-pin (supports up to 600 W to GPU)
• Motherboard connector: 24-pin ATX
• Fan: 135 mm, fluid dynamic bearing
• Input voltage/frequency: 100–240 V~, 50/60 Hz
• Included cables: CPU, PCIe, Peripheral (Molex), SATA
• Color: Black

How to use

Install the unit in a standard ATX case and connect the 24-pin ATX cable to the motherboard. Use the modular cables provided to connect CPU and PCIe power connectors as required by your components; only attach the cables you need to reduce clutter. For compatible GPUs with PCIe CEM 5.1, connect the native 16-pin cable, ensuring the dual-color connector is fully seated. Connect SATA and peripheral cables to storage devices as needed. Verify input voltage compatibility (100–240 V) before powering on the system.

Recommendations

For reliable operation, use appropriate cable management and ensure adequate case airflow. When installing high-power graphics cards, confirm that the 16-pin PCIe connector is fully engaged and that your case power and cooling can handle peak loads. Regularly check connections and keep the PSU vents free of dust to maintain efficiency and stable performance.