MSI MAG A1250GL 1250W 80+ Gold Fully Modular ATX 3.1 Power Supply

The MSI MAG A1250GL is a 1250-watt fully modular power supply built to the ATX 3.1 standard, making it a capable foundation for high-performance gaming and workstation builds. Its native PCIe CEM 5.1 connector — a dual-colour 16-pin cable rated at up to 600 W — delivers the transient headroom that modern discrete graphics cards demand without adapters or daisy-chaining workarounds. Efficiency is certified at 80 PLUS Gold, meaning the unit operates at up to 90 percent efficiency under typical load conditions, keeping heat output and energy waste to a minimum. The power topology combines a half-bridge LLC resonant converter with synchronous rectification and a DC-to-DC module, a design that delivers stable output voltages and fast transient response across changing load scenarios. Cable management is handled through a fully modular connector panel. Only the cables a build actually requires need to be installed, reducing interior clutter and improving airflow. The included flat cables further simplify routing through tight cable channels and behind motherboard trays. Cooling relies on a 135 mm fluid dynamic bearing fan. Fluid dynamic bearings offer smoother, quieter operation and longer service life compared to sleeve-bearing alternatives, and the fan size allows a lower rotational speed at a given airflow volume. Six independent protection circuits — over-current (OCP), over-voltage (OVP), over-power (OPP), over-temperature (OTP), short-circuit (SCP), and under-voltage (UVP) — monitor the unit continuously, shutting down or throttling output before hardware damage can occur. The ATX 3.1 specification requires PSUs to handle transient power excursions of up to 200 percent of rated power for 100 microseconds; the MAG A1250GL supports up to 2500 W excursion peaks, keeping the system stable during GPU boost spikes. MSI backs the unit with a seven-year warranty. Verified Specifications: - Model: MAG-A1250GL-PCIE5 - Rated Power: 1250 W - Efficiency: 80 PLUS Gold (up to 90%) - Standard: ATX 3.1 - Modular: Fully modular - Fan: 135 mm fluid dynamic bearing - Dimensions (D×W×H): 150 × 150 × 86 mm - Input Voltage: 100–240 V~, 50–60 Hz - PFC: Active - Power Excursion: 2500 W (up to 200% rated, 100 µs) - Connectors: 1× ATX 24-pin, 2× EPS 4+4-pin, 1× PCIe 5.1 16-pin (600 W), 4× PCIe 6+2-pin, 12× SATA 15-pin, 4× Molex 4-pin, 1× FDD 4-pin - Protection: OCP / OVP / OPP / OTP / SCP / UVP - Warranty: 7 years