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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

  • Max wattage850 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 (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.

How it compares

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

Price $77.99
Cheaper than about 76% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameRosewill
Model nameCMG850
Product typeATX 3.0 Compatible / ATX 3.1 Compatible
Graphics
SLI supportReady
CrossFire supportReady
Ports & slots
PCIe power connectors4 × 6+2-Pin
SATA power connectors9
Output type+3.3 V@18A, +5 V@18A
Connection types1 × 20+4-Pin Main Connector
2 × 4+4-Pin ATX12 V / EPS12 V Connector
4 × 6+2-Pin PCI-E Connector
9 x SATA Connector
4 × 4-Pin Peripheral Connector
Power
Max wattage850 W
Power efficiencyUp to 92%
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Power good signal1-100 ms
Power hold-up time16 ms min.
Efficiency certification80 PLUS GOLD Certified
Supply voltage100–240 V
AC input frequency50/60 Hz
Size & build
Product dimensions3.39 in × 5.91 in × 5.51 in
Shipping weight2.84 kg
Package size290 × 226 × 117 mm
Compatibility
PSU length limit140 mm
Environment & compliance
Regulatory approvalscTUVus, FCC certified
More details
Fan configuration1 x Silent 120 mm FDB fan
Mean time between failures>100,000 h

Other versions of this model

2 more in the same range

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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