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Black rectangular ATX power supply unit with 135 mm fan grille and modular cable sockets

MSI

MSI MAG A1250GL PCIE5 power supply

SKU CH-2WCC-AH7DA MPN MAG A1250GL PCIE5

A 1250 W ATX 3.1 power supply with 80 PLUS Gold efficiency, a 135 mm fluid dynamic bearing fan, fully modular cabling and a native 12V-2x6 PCIe 5.1 connector for 600 W GPU support

  • Max wattage1250 W
  • Power efficiency> 85%
  • Modular cablingNo
  • Fan configuration1 × 135 mm Fluid Dynamic Bearing
  • Power factor correctionActive
  • Main power connector20+4 Pin

Type ATX 3.1 (1250W)

  • 80 PLUS Gold certified for up to 90 percent efficiency
  • ATX 3.1 ready handles up to 2x power excursions
  • PCIe 5.1 native 16-pin connector delivers 600W to GPU
  • Fully modular design uses only needed cables for better airflow
  • Compact 150 mm ATX frame fits space-efficient builds

1250 W ATX 3.1 power supply

The MSI MAG A1250GL PCIE5 delivers 1250 W of continuous power for high-end desktop builds. It meets the ATX 3.1 and PCIe 5.1 specifications and carries 80 PLUS Gold certification for up to 90% efficiency. A fully modular cable set lets you connect only the leads your system requires. The unit fits a compact 150 mm chassis depth.

Thermals noise and power draw

A single 135 mm fluid dynamic bearing fan handles cooling while the Gold-rated topology keeps waste heat low at typical loads. Active PFC corrects the power factor across the 100–240 V input range for stable draw. The dual +12 V rail design distributes current cleanly to the motherboard and graphics connectors. Efficiency above 85% reduces the thermal load inside the case during everyday use.

Sustained load behavior

Under prolonged demand the full-bridge LLC DC-to-DC conversion maintains tight regulation on the +12 V, 5 V and 3.3 V rails. The native 12V-2x6 connector can supply up to 600 W to a PCIe 5.1 graphics card without adapter cables. Protection circuits guard against over-voltage, over-current and short-circuit events during extended sessions. The 10-year manufacturer warranty period reflects the expected service life.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $155.99
Typical for this category: the median of 10,869 items is $142.99.
Max wattage 1250 W
Higher than about 90% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameMSI
Product lineRMx Series
Model nameMAG A1250GL PCIE5
Product typeATX 12 V
Product colorBlack
Performance
Frequency50/60 Hz
Graphics
SLI supportCertified
Ports & slots
SATA power connectors16
Output type+5 V@22A, +3.3 V@22A, +5VSB@3A
Connection types1 x ATX (24 PIN)
2 x EPS (4+4 PIN)
1x PCI-E 5.1 (16 PIN)
4 x PCI-E (6+2 PIN)
12 x SATA (15 PIN)
4 x MOLEX (4 PIN)
1 x Molex to FDD Adapter
12V power connector1 × 4 Pin ATX 12 V
Floppy connector1
Peripheral connector1
Power
Max wattage1250 W
Power efficiency> 85%
Modular cablingNo
Power factor correctionActive
Main power connector20+4 Pin
12V rails2
Efficiency certification80 PLUS GOLD Certified
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current10A @ 115 V, 5A @ 230 V
Built-in protectionOCP / OVP / OPP / OTP / SCP / UVP
Peak wattage1250 W
+3.3V max. current8A
+12V1 max. current9A
+12V2 max. current10A
+12V3 max. current30A
+12V4 max. current28A
+12V5 max. current29A
+12V6 max. current28A
+5VSB max. current5A
Size & build
Size or dimensions11.5 in × 9.25 in × 5 in
Product dimensions20'
Product weight3.502 kg
Shipping weight3.49 kg
Package size305 × 241 × 127 mm
Compatibility
PSU length limit150 mm
In the box
Included itemsMAGA1250GLPCIE5, 1, false
Fans total quantity1
Environment & compliance
Top fans noise levelAir
More details
Fan configuration1 × 135 mm Fluid Dynamic Bearing
Top fans LEDBlue
Rear fans LEDBlue

Other versions of this model

5 more in the same range

Questions about this item

Will the 150 mm length fit my compact ATX case?

The unit measures 150 mm long, so it fits most mid-tower and many compact ATX cases; check your case clearance before ordering.

Can the native 12V-2x6 connector deliver 600 W to my PCIe 5.1 graphics card?

Yes, the included 16-pin cable is rated for 600 W, meeting the PCIe 5.1 GPU power excursion requirement.

Do I need extra cables for a build with multiple drives and two EPS motherboard connectors?

The box supplies 12 SATA, 4 MOLEX, 2 EPS (4+4 PIN) and 4 PCI-E (6+2 PIN) cables, covering most high-end builds without extras.

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