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

Rosewill

Rosewill CMG850 850W ATX 3.0 3.1 80+ Gold Full Modular Power Supply

SKU CH-RY1A-2JDAK MPN CMG850

An 850 W ATX 3.0 and 3.1 compatible supply with 80 PLUS Gold efficiency, fully modular cables and a native 600 W 12V-2x6 connector for PCIe 5.0 graphics cards

  • TypeATX 3.0 Compatible / ATX 3.1 Compatible
  • Maximum Power850 W
  • Fans1 x Silent 120mm FDB fan
  • PFCActive
  • Main Connector20+4Pin
  • +12V RailsSingle

Options CMG ATX 3.1 (850W)

  • 850 W capacity powers demanding builds
  • ATX 3.0 and 3.1 ready for modern platforms
  • 80 PLUS Gold efficiency up to 92 %
  • Fully modular cabling keeps the case tidy
  • Native 600 W PCIe 5.0 12V-2x6 connector supports high-end GPUs

Ready for ATX 3.0 and 3.1 systems

This 850 W unit meets Intel ATX 3.0 and 3.1 requirements and carries 80 PLUS Gold certification. A single +12 V rail delivers the full rated power to modern graphics cards and CPUs. Full modular cabling lets you install only the leads your build needs.

Silent 120 mm FDB fan and high efficiency

One fluid-dynamic-bearing fan keeps airflow steady while noise stays low in typical loads. Efficiency reaches up to 92 %, so less waste heat enters the case. Hold-up time is 16 ms minimum and the power-good signal arrives in 1 to 100 ms for stable operation.

Compact 140 mm depth with native 12V-2x6 cable

The short chassis fits tight enclosures while providing a native 600 W PCIe 5.0 12V-2x6 connector plus four 6+2-pin PCIe leads. Nine SATA connectors and four peripheral plugs support plenty of drives and accessories. Japanese electrolytic capacitors and a >100,000 hour MTBF back long-term reliability.

Highlights

  • 850 W capacity powers demanding builds
  • ATX 3.0 and 3.1 ready for modern platforms
  • 80 PLUS Gold efficiency up to 92 %
  • Fully modular cabling keeps the case tidy
  • Native 600 W PCIe 5.0 12V-2x6 connector supports high-end GPUs

Specifications

BrandRosewill
ModelCMG850
TypeATX 3.0 Compatible / ATX 3.1 Compatible
Maximum Power850 W
Fans1 x Silent 120mm FDB fan
PFCActive
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector4 x 6+2-Pin
SATA Power Connector9
SLISLI Ready
CrossFireCrossFire Ready
Max PSU Length140 mm
ModularFull Modular
Power Good Signal1-100ms
Hold-up Time16ms min.
EfficiencyUp to 92%
Energy-Efficient80 PLUS GOLD Certified
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Output+3.3V@18A, +5V@18A, [email protected] , [email protected] , [email protected]
MTBF>100,000 Hours
ApprovalscTUVus, FCC certified
Connectors1 x 20+4-Pin Main Connector
2 x 4+4-Pin ATX12V / EPS12V Connector
4 x 6+2-Pin PCI-E Connector
9 x SATA Connector
4 x 4-Pin Peripheral Connector
Features80 PLUS GOLD Certified
Compact 140mm size
850 Watts Max Power
Single strong 12V rail - ideal for Gaming system
SLI & CrossFire ready - 2 x 6+2-Pin Connector
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 weight2.84 kg
Package size290 × 226 × 117 mm

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Questions about this item

How do I route the native 12V-2x6 cable for a PCIe 5.0 graphics card and what step is often missed?

Connect the 12V-2x6 plug directly to the GPU; the step often missed is seating the connector until the latch clicks, ensuring the 600 W excursion rating is fully engaged.

Which component sets the service interval and what is its rated lifetime?

The 120 mm FDB fan and Japanese electrolytic capacitors define the interval; MTBF is rated at 100000 hours.

What protection limit triggers first during a sustained heavy load?

The single 12 V rail delivers up to 850 W continuous; the over-power protection trips at the 235 % excursion threshold before thermal limits are reached.

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