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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.

  • TypeATX 3.0 Compatible / ATX 3.1 Compatible
  • Maximum Power1200 W
  • Fans1 x Silent 120mm FDB fan
  • PFCActive
  • Main Connector20+4Pin
  • +12V RailsSingle

Options 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.

Highlights

  • 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

Specifications

BrandRosewill
SeriesCMG
ModelCMG1200G5
TypeATX 3.0 Compatible / ATX 3.1 Compatible
Maximum Power1200 W
Fans1 x Silent 120mm FDB fan
PFCActive
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector4 x 6+2-Pin & 1x 12+4-Pin
SATA Power Connector8
SLISLI Ready
CrossFireCrossFire Ready
Max PSU Length140 mm
ModularFull Modular
Hold-up Time16ms min.
EfficiencyUp to 92%
Energy-Efficient80 PLUS GOLD Certified
Over Voltage ProtectionYes
Overload ProtectionYes
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Output+3.3V@25A, +5V@25A, +12V@100A, [email protected] , +5VSB@3A
Connectors1 x 20+4-Pin Main Connector
2 x 4+4-Pin ATX12V / EPS12V Connector
4 x 6+2-Pin PCI-E Connector
1 x 12+4-Pin 12VHPWR Connector
8 x 15-Pin SATA Connector
4 x 4-Pin Peripheral Connector
FeaturesNewest PCIe 5.0 and ATX 3.0 Compatible
12+4-Pin 12VHPWR Connector
80 PLUS GOLD Certified
Compact 140mm size
1200 Watts Max Power
Single strong 12V rail - ideal for Gaming system
1 x Silent 120mm FDB Fan
Active-PFC with auto AC-input voltage adjustment (100 - 240V)
Over Temperature Protection / Over Current Protection / Over Voltage Protection / Power Protection, Under Voltage Protection, and Short Circuit Protection provide maximum safety to your critical system components
Safety & EMI Approval: cTUVus, FCC
Dimensions3.39" x 5.91" x 5.51"
Shipping weight2.97 kg
Package size279 × 229 × 117 mm

Other versions of this model

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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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