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Rectangular black metal PSU with perforated side vents and a 120mm fan grille, modular cable sockets on the front face

Rosewill Open box

Rosewill VMG850 850W ATX 3.1 power supply

SKU CH-8JA5-S3058 MPN VMG850

Full-modular ATX 3.1 unit delivers 850 W through a 120 mm FDB fan and native 12V-2x6 connector

  • Max wattage850 W
  • Power efficiencyUp to 85%
  • Modular cablingFull Modular
  • Fan configuration1 × 120 mm FDBfan
  • Power factor correctionActive
  • Main power connector20+4Pin
  • ATX 3.0 and 3.1 ready for modern platforms
  • 80 PLUS Gold certified efficiency up to 85 percent
  • Full modular cabling with native 12V-2x6 PCIe 5.1 connector
  • Compact 140 mm depth fits small form factor builds
  • 120 mm FDB fan with steel vented shell for quiet cooling

Compact 850W ATX 3.1 unit

The Rosewill VMG850 is an 850W ATX 3.1 compatible power supply built in a 140 mm deep chassis. Its fully modular design and 120 mm FDB fan suit builders fitting a high-wattage unit into restricted space. The single +12V rail and 80 PLUS Gold certification target systems that need steady, efficient delivery.

Native 12V-2x6 cable and modular set

A dedicated 12+4-pin 12V-2x6 connector ships attached to a native PCIe 5.1 cable, removing adapters for new graphics cards. Three 6+2-pin PCI-E leads, two 4+4-pin EPS cables, eight SATA connectors and four peripheral plugs cover storage and CPU power without surplus cables crowding the case.

Excursion headroom and hold-up limits

The platform allows up to 235% total power excursion and 300% GPU power excursion for short bursts, while minimum hold-up time sits at 16 ms. Efficiency peaks at 85% under typical load, so sustained draws near the 850 W rating will generate more heat than lower-load scenarios.

How it compares

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

Price $56.99
Cheaper than about 87% 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 nameVMG850
Product typeATX 3.1 Compatible
Graphics
CrossFire supportReady
Ports & slots
SATA power connectors6
Output type+3.3 V@18A, +5 V@18A, +5VSB@3A
Power
Max wattage850 W
Power efficiencyUp to 85%
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
Size & build
Shipping weight2.45 kg
Package size273 × 203 × 114 mm
Compatibility
PSU length limit140 mm
More details
Fan configuration1 × 120 mm FDBfan

Questions about this item

Will the 120mm FDB fan need replacement after years of continuous operation?

The fluid-dynamic-bearing fan is rated for long service life; no user-serviceable parts are inside, so replacement would require a full unit swap if the bearing ever wears out.

What thermal limit appears first when the 850W output is sustained for hours?

The 120mm FDB fan ramps up to move heat through the large vents; the over-temperature protection will trip before any component exceeds its safe operating point.

How loud is the 120mm FDB fan and how much heat does the unit exhaust when running all day at typical load?

The fan runs quietly at low loads and increases speed only as needed; the steel shell and large vents dissipate heat efficiently so case temperatures stay manageable during extended use.

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