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Rectangular steel power supply with large side vents, 120mm fan, semi-modular cables visible

Rosewill

Rosewill VSB850 850W 80+ Bronze ATX 3.1 Semi-Modular Power Supply

SKU CH-8FQH-NM9Q7 MPN VSB850

Delivers 850 W with 80 PLUS Bronze efficiency, ATX 3.1 compatibility and a native 12V-2x6 connector for modern GPUs in a compact 140 mm semi-modular design

  • TypeATX 3.1 Compatible
  • Maximum Power850 W
  • Fans1 x 120 mm
  • PFCActive
  • Main Connector20+4Pin
  • +12V RailsSingle

Options ATX 3.1 80+ Bronze (850W)

  • Ready for modern builds with ATX 3.0 and 3.1 compliance
  • Efficient 80 PLUS Bronze rating keeps energy waste low
  • Native 12V-2x6 cable feeds 600W to new GPUs
  • Compact 140 mm depth fits 35% smaller cases
  • 120 mm ICB fan with large vents maintains cool operation

What this unit is

The Rosewill VSB850 is an 850 W ATX 3.1 compatible semi-modular power supply built for desktop systems that need modern GPU support. It carries 80 PLUS Bronze certification with up to 85% efficiency and uses a single +12V rail design backed by 105°C Japanese capacitors. The 120 mm ICB fan runs inside a compact 140 mm deep chassis.

Who should consider it

Builders assembling a compact system around a PCIe 5.1 graphics card will benefit from the native 12+4-pin 12V-2x6 cable and the 140 mm length that fits tight cases. The six SATA connectors and three peripheral plugs cover typical storage and accessory needs. Systems requiring fully modular cabling or higher efficiency ratings should evaluate other models.

Deciding specification

The inclusion of a native 12+4-pin 12V-2x6 connector rated for 600 W direct delivery is the single spec that determines whether this unit matches a next-generation graphics card. Without that cable a builder would need an adapter which adds failure points and cable bulk.

Points forts

  • Ready for modern builds with ATX 3.0 and 3.1 compliance
  • Efficient 80 PLUS Bronze rating keeps energy waste low
  • Native 12V-2x6 cable feeds 600W to new GPUs
  • Compact 140 mm depth fits 35% smaller cases
  • 120 mm ICB fan with large vents maintains cool operation

Caractéristiques

BrandRosewill
ModelVSB850
TypeATX 3.1 Compatible
Maximum Power850 W
Fans1 x 120 mm
PFCActive
Main Connector20+4Pin
+12V RailsSingle
SATA Power Connector6
CrossFireCrossFire Ready
Max PSU Length140 mm
ModularSemi-Modular
Hold-up Time16ms min.
EfficiencyUp to 85%
Energy-Efficient80 PLUS BRONZE Certified
Over Voltage ProtectionYes
Overload ProtectionYes
Output+3.3V@18A, +5V@18A, [email protected] , [email protected] , +5VSB@3A
Connectors1 x 20+4-Pin Main Connector
2 x 4+4-Pin ATX12V / EPS12V Connector
2 x 6+2-Pin PCI-E Connector
1 x 12+4-Pin 12V-2x6 Connector
6 x 15-Pin SATA Connector
3 x 4-Pin Peripheral Connector
Poids d’expédition2.23 kg
Dimensions du colis267 × 203 × 112 mm

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Questions sur cet article

What does the 850 W rating mean for a typical desktop build?

The 850 W rating is the maximum continuous power the unit can deliver across all rails, enough for a high-end CPU and a modern graphics card with headroom for transient spikes.

What does ATX 3.1 compatibility cap in practice?

ATX 3.1 compatibility means the unit includes a native 12V-2x6 connector rated for 600 W, supporting the power-excursion profiles required by current PCIe 5.1 graphics cards.

Will the 140 mm depth fit in a compact case?

At 140 mm deep the chassis is 35 % shorter than many standard units, so it fits most mid-tower and many small-form-factor cases that accept ATX power supplies.

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