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Rectangular black metal PSU with modular cable ports and a 120mm fan grille

Rosewill

Rosewill CMG1200G5 1200W ATX 3.0 3.1 80 Plus Gold fully modular power supply

SKU CH-Q6ER-486SH MPN CMG1200G5

A 1200 W ATX 3.0 and 3.1 compatible, fully modular unit with 80 Plus Gold efficiency, a native 600 W PCIe 5.0 12+4-pin cable.

  • Max wattage1200 W
  • Power efficiencyUp to 92%
  • Modular cablingFull Modular
  • Fan configuration1 x Silent 120 mm FDB fan
  • Power factor correctionActive
  • Main power connector20+4Pin

Model CMG ATX 3.1 (1200W)

  • ATX 3.0 and 3.1 ready for modern platforms
  • 80 Plus Gold certified up to 92% efficiency
  • Native 600W PCIe 5.0 12V-2x6 connector
  • Fully modular cabling reduces clutter and improves airflow
  • 100% Japanese capacitors with 16ms hold-up time

1200 W ATX 3.0 and 3.1 power supply

This unit delivers 1200 W of continuous power and meets both ATX 3.0 and ATX 3.1 specifications. It is built for systems that need a single high-capacity rail and native support for modern GPU power connectors. The fully modular design lets you attach only the cables your build requires.

Sustained load behaviour

The supply holds 80 PLUS Gold certification with up to 92 percent efficiency at typical loads. A 16 ms minimum hold-up time keeps the system stable during brief power interruptions. Protection circuits cover over voltage, under voltage, over current, short circuit, over power and over temperature to maintain safe operation under continuous demand.

Build quality and connectors

All electrolytic capacitors are Japanese sourced for long-term reliability. A 120 mm fluid dynamic bearing fan runs quietly and stops completely in ECO mode when the load is light. The compact 140 mm depth fits standard ATX cases while providing four 6+2-pin PCIe connectors and one 12+4-pin 12V-2x6 cable rated for 600 W. Eight SATA power connectors are included for drives and accessories.

How it compares

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

Price $102.99
Cheaper than about 66% of the 10,869 comparable items (median $142.99).
Max wattage 1200 W
Higher than about 90% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameRosewill
Product lineCMG
Model nameCMG1200G5
Product typeATX 3.0 Compatible / ATX 3.1 Compatible
Graphics
SLI supportReady
CrossFire supportReady
Ports & slots
PCIe power connectors4 × 6+2-Pin & 1x 12+4-Pin
SATA power connectors8
Output type+3.3 V@25A, +5 V@25A, +12 V@100A, +5VSB@3A
Power
Max wattage1200 W
Power efficiencyUp to 92%
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Power hold-up time16 ms min.
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Overload protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Size & build
Product dimensions3.39 in × 5.91 in × 5.51 in
Shipping weight2.97 kg
Package size279 × 229 × 117 mm
Compatibility
PSU length limit140 mm
More details
Fan configuration1 x Silent 120 mm FDB fan

Other versions of this model

2 more in the same range

Questions about this item

How loud does the 120 mm FDB fan get when the 1200 W unit runs continuously at high load?

The fluid-dynamic-bearing fan stays quiet under load, and ECO mode stops it completely at low loads for near-silent operation.

Which cables must I already have to connect the 20+4-pin main, 6+2-pin PCIe and SATA devices to this fully modular supply?

All required cables — 20+4-pin ATX, four 6+2-pin PCIe, one 12+4-pin 12V-2x6 and eight SATA — are included in the box.

Will the single +12 V rail and 140 mm length work with an older ATX 2.x motherboard and standard mid-tower case?

Yes, the single-rail design and 140 mm depth fit legacy ATX boards and most mid-tower cases, and ATX 3.0/3.1 compatibility covers older specs.

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