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

MSI Open box

MSI MAG A1250GL PCIE5 1250W power supply 10 year warranty

SKU CH-TKAJ-8M3NF MPN MAG A1250GL PCIE5

Fully modular 1250 W ATX unit with 80 PLUS Gold efficiency, a 135 mm fluid-dynamic-bearing fan and a native 16-pin PCI-E 5.1 connector

  • Max wattage1250 W
  • Modular cablingFull Modular
  • Fan configuration1 × 135 mm Fluid Dynamic Bearing
  • Power factor correctionActive
  • PSU length limit150 mm
  • Efficiency certification80 PLUS GOLD Certified
  • 1250 W output powers demanding multi-GPU builds
  • 80 PLUS Gold certification reduces waste heat and running cost
  • Full modular cabling keeps the interior tidy and airflow clear
  • 135 mm fluid-dynamic-bearing fan runs quietly under load
  • Comprehensive OCP OVP OPP OTP SCP UVP protection safeguards every component

1250 W Fully Modular ATX Power Supply

The MSI MAG A1250GL PCIE5 is a 1250 W ATX 12V unit with full modular cabling and an 80 PLUS Gold efficiency rating. A 135 mm fluid-dynamic-bearing fan handles cooling. The chassis is 150 mm deep and finished in black.

Suited to high-power PC builds

This unit fits builders who need a 1250 W supply with native 12V-2×6 and four 6+2-pin PCIe connectors for multiple GPUs. It is not for systems that require a smaller form factor such as SFX, nor for users who need more than four 8-pin PCIe leads or additional EPS connectors beyond the two provided.

12V-2×6 connector for PCIe 5.1 graphics cards

The power supply includes one 16-pin 12V-2×6 cable compliant with the PCIe 5.1 connector standard. This single native cable decides whether the unit can power a modern high-wattage graphics card without using adapter cables.

How it compares

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

Price $158.99
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
Model nameMAG A1250GL PCIE5
Product colorBlack
Product typeIntel ATX 12 V
Ports & slots
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
Power
Max wattage1250 W
Modular cablingFull Modular
Power factor correctionActive
Efficiency certification80 PLUS GOLD Certified
Built-in protectionOCP / OVP / OPP / OTP / SCP / UVP
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current15A (Max.)
Size & build
Product dimensions11.53 × 9.25 × 5.08 in
Product weight7.6 lb (3.45 kg)
Shipping weight3.49 kg
Package size305 × 241 × 127 mm
Compatibility
PSU length limit150 mm
More details
Fan configuration1 × 135 mm Fluid Dynamic Bearing

Questions about this item

What does the 1250 W rating mean for a high-end build?

It delivers up to 1250 W continuous power with 80 PLUS Gold efficiency, so a CPU and GPU drawing near that limit still run within spec.

How does the PCIe 5.1 16-pin connector affect graphics-card power delivery?

The single 16-pin PCIe 5.1 cable connects directly to compatible GPUs, while four 6+2-pin cables handle additional cards or older models.

Will the 150 mm length fit my mid-tower case?

At 150 mm long the unit matches the standard ATX depth, so it fits most mid-tower and larger cases that accept full-size power supplies.

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