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Black rectangular ATX power supply with large side vents and a 120mm fan grille

Rosewill

Rosewill VMG850 850W 80+ Gold ATX 3.1 power supply

SKU CH-H2YE-BXYCQ MPN VMG850

An 850 W ATX 3.1 power supply with full modular cabling, 80 PLUS Gold efficiency, a native 12V-2x6 connector for PCIe 5.1 graphics cards and a 120 mm FDB fan in a 140 mm compact chassis

  • Max wattage850 W
  • Power efficiencyUp to 85%
  • Modular cablingFull Modular
  • Fan configuration1 × 120 mm FDBfan
  • Power factor correctionActive
  • Main power connector20+4Pin

Model ATX 3.1 80+ Gold (850W)

  • Delivers 850 W continuous power for demanding builds
  • 80 PLUS Gold certification reaches 85% efficiency at typical loads
  • Full modular cabling reduces clutter and improves airflow
  • Native 12V-2x6 connector supplies 600 W to PCIe 5.1 graphics cards
  • Compact 140 mm depth fits 35% smaller chassis designs

ATX 3.1 850 W power supply

The Rosewill VMG850 is an ATX 3.1 compatible, fully modular unit rated at 850 W. It carries 80 PLUS Gold certification and uses a single +12 V rail backed by 100 % Japanese electrolytic capacitors. A 120 mm FDB fan provides cooling in a compact 140 mm deep chassis suited to small-form-factor builds.

Pre-installation checklist

Verify that your case can accept a power supply up to 140 mm in length and that the motherboard requires a 20+4 pin main connector plus two 4+4 pin EPS connectors. Ensure the graphics card needs no more than three 6+2 pin PCIe connectors or the single 12+4 pin 12V-2x6 connector supplied. Confirm the unit’s SATA and peripheral connector counts match your storage and accessory needs.

Sustained-load behaviour

The platform is rated for up to 235 % power excursion and 300 % GPU power excursion, allowing brief peaks well above the continuous 850 W rating. Hold-up time is specified at a minimum of 16 ms, giving the system a short ride-through during mains interruptions. A six-protection suite covering OCP, OPP, OTP, OVP, SCP and UCP maintains safe operation during prolonged heavy loads.

How it compares

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

Price $71.99
Cheaper than about 78% 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

Other versions of this model

3 more in the same range

Questions about this item

Does the VMG850 box include the 12V-2x6 cable for my GPU, or do I need to buy it separately?

The full-modular unit ships with one native 12+4-pin 12V-2x6 cable, three 6+2-pin PCI-E cables, two 4+4-pin EPS cables, eight SATA cables and four peripheral cables, so no extra GPU power cable is required.

Should I pick this 850 W model or a lower-wattage unit for a single modern graphics card?

At 850 W the supply delivers up to 600 W through the 12V-2x6 connector and supports 300 % GPU power excursion, giving ample headroom for a single high-end card and future upgrades.

What does the 80 PLUS Gold rating actually mean for my daily power draw?

The certification guarantees at least 85 % efficiency at typical loads, so less electricity is wasted as heat and the 120 mm FDB fan can run quieter during normal use.

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