MSI MAG SERIES POWER SUPPLY
MSI MAG A1250GL PCIE5 1250W 80 PLUS Gold Power Supply
High-capacity 1250W power delivery, ATX 3.1 readiness, PCIe 5.1 connectivity and fully modular flat cables for powerful gaming PCs and enthusiast workstations.
MSI MAG A1250GL PCIE5 at a Glance
Introduction
The MSI MAG A1250GL PCIE5 1250W 80 PLUS Gold Power Supply is built for high-performance desktop systems that require substantial power capacity, modern GPU connectivity and flexible cable management. With 1250W of rated output, it is designed for compatible enthusiast gaming PCs, demanding workstations and multi-component configurations.
The unit is ATX 3.1 ready and supports PCIe 5.1 power connectivity. Its native dual-colour 16-pin GPU cable is rated for up to 600W, with a yellow connector section intended to help users visually check that the plug is inserted correctly.
The fully modular design lets builders connect only the cables required by their hardware. Flat cables help with routing and cable management, while the 150 × 150 × 86mm chassis follows a standard ATX PSU footprint.
An active PFC design, LLC half-bridge topology with DC-to-DC conversion, and a 135mm fluid dynamic bearing fan form the foundation of its power delivery and cooling design.
Key Features
1250W High-Capacity Output
Provides 1250W of rated power for compatible high-performance systems, with the +12V rail delivering up to 1249W for major system components.
80 PLUS Gold Efficiency
Gold certification with advertised efficiency of up to 90% helps reduce energy lost during power conversion under suitable operating conditions.
Native PCIe 5.1 16-Pin Cable
Includes one native 16-pin PCIe 5.1 GPU power connection rated for up to 600W for compatible graphics cards.
ATX 3.1 Power Excursion Support
Designed to handle total power excursions up to 2500W for 100 microseconds, equivalent to 200% of its rated output, according to MSI's specification.
135mm Fluid Dynamic Bearing Fan
A fluid dynamic bearing fan provides cooling for the PSU during operation, helping maintain airflow under varying system loads.
Six Protection Mechanisms
Includes over-current, over-voltage, over-power, over-temperature, short-circuit and under-voltage protection.
Power Delivery and Cooling Technology
The MAG A1250GL PCIE5 uses active power factor correction and LLC half-bridge topology with DC-to-DC conversion. Its single +12V output is rated at 104.1A, providing up to 1249W for compatible CPU, GPU and other system power requirements.
ATX 3.1 readiness supports the handling of short-duration power excursions. MSI specifies a total excursion capability of up to 2500W for 100 microseconds, while its product page also describes support for GPU power excursions up to three times the rated GPU power under applicable conditions.
The native PCIe 5.1 16-pin cable supports up to 600W for compatible graphics cards. Its dual-colour connector is designed to make it easier to check insertion visually; always ensure the plug is fully seated and follow the graphics-card manufacturer's cable-routing instructions.
The 135mm fluid dynamic bearing fan provides active cooling. The PSU also includes six listed protection mechanisms: OCP, OVP, OPP, OTP, SCP and UVP.
Technical Specifications
Specifications are based on MSI's official MAG A1250GL PCIE5 product and specification pages. Confirm regional packaging, included cables and warranty terms with the seller before purchase.
Recommended Use Cases
High-End Gaming PCs
Suitable for compatible gaming builds with powerful graphics cards and processors that benefit from a high-capacity PSU and modern GPU power connectivity.
Content Creation Workstations
A potential fit for compatible systems used for 3D rendering, video production, simulation and other demanding workloads.
Multi-Drive Systems
The 12 SATA and four Molex connectors provide flexibility for compatible systems with multiple storage devices and peripherals.
Enthusiast PC Builds
Fully modular cabling and ATX 3.1 readiness make it suitable for carefully planned enthusiast builds with compatible components and sufficient case clearance.
Before You Buy
- Confirm that 1250W is appropriate for your complete PC configuration. Higher wattage alone does not guarantee compatibility with every GPU or workstation.
- Check the graphics card's recommended PSU wattage and required power connector. The included native 16-pin cable supports up to 600W for compatible GPUs.
- Ensure the PSU's 150 × 150 × 86mm dimensions fit your case and allow enough space for modular cable routing.
- Use only modular cables supplied with this PSU or cables explicitly confirmed as compatible with this exact model. Modular PSU-side pinouts are not universally interchangeable.
- Make sure the 16-pin GPU connector is fully seated and avoid sharp bends or sideways tension close to the connector.
- MSI's published specification lists a 50–60Hz input range. If your installation requires operation outside that range, confirm suitability with MSI or the authorised seller.
Frequently Asked Questions
1. Is the MSI MAG A1250GL PCIE5 a 1250W power supply?
Yes. MSI specifies 1250W of total output, with up to 1249W available on the +12V rail.
2. Does the MAG A1250GL PCIE5 support ATX 3.1?
Yes. MSI describes this model as ATX 3.1 ready, with support for power excursions under the specified operating conditions.
3. Does it include a native 16-pin GPU power cable?
Yes. The specification lists one PCIe 5.1 16-pin connector rated for up to 600W for compatible graphics cards.
4. Is the MSI MAG A1250GL PCIE5 fully modular?
Yes. Its fully modular design lets you connect only the cables required for your hardware, helping simplify cable management.
5. What does 80 PLUS Gold mean?
80 PLUS Gold is an efficiency certification. MSI advertises efficiency of up to 90%; actual efficiency depends on load and operating conditions.
6. What is the maximum power excursion supported?
MSI specifies a total power excursion of up to 2500W for 100 microseconds, equivalent to 200% of the PSU's rated output. This is a short-duration excursion rating, not its continuous output.
7. What cooling fan does this PSU use?
It uses a 135mm fluid dynamic bearing fan for cooling during operation.
8. Which protection features are included?
MSI lists over-current protection (OCP), over-voltage protection (OVP), over-power protection (OPP), over-temperature protection (OTP), short-circuit protection (SCP) and under-voltage protection (UVP).
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