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Rectangular steel power supply with large side vents, 120 mm fan, fixed cable bundle, matte finish

Rosewill

Rosewill VNW550 550W 80 PLUS power supply

SKU CH-47YK-Q4GFE MPN VNW550

A 550 W 80 PLUS certified non-modular PSU with a single 12 V rail, two PCIe connectors and six SATA connectors in a compact 140 mm chassis

  • Maximum Power550 W
  • Fans1 x 120 mm
  • PFCActive
  • Main Connector24Pin
  • +12V RailsSingle
  • PCI-Express Connector2 x 6+2-Pin

Option 550W

  • 80 PLUS certification delivers up to 80% efficiency
  • Single +12V rail with DC-DC design provides stable voltage
  • 120 mm FDB fan and vented steel shell optimise thermal control
  • Compact 140 mm length fits small-form-factor builds
  • Five protection circuits safeguard against over-voltage, overload and short-circuit

550 W 80 PLUS Power Supply

The Rosewill VNW550 delivers 550 W of continuous power for desktop builds. Its non-modular cable set includes a 20+4-pin main connector, two 4+4-pin CPU connectors, two 6+2-pin PCIe connectors and six SATA connectors. The unit measures 140 mm in length and fits small-form-factor cases. Active PFC and a single +12 V rail provide stable voltage across all loads.

Sustained Load Behaviour

A 120 mm FDB fan and large steel vents maintain airflow during extended operation. The five-protection suite (UVP, OVP, OPP, SCP, OCP) guards components when demand remains high. Hold-up time of 16 ms minimum keeps the system running through brief mains interruptions. DC-DC design on the +12 V rail ensures clean voltage delivery under continuous stress.

80 PLUS Efficiency Limits

The 80 PLUS White certification guarantees up to 80 % efficiency at typical loads. Efficiency drops below that threshold at very light or peak loads, so sustained high draw converts more input power to heat. The compact 140×150×86 mm chassis limits thermal mass, making case airflow important for long sessions. Non-modular cables add resistance that slightly reduces usable headroom at full rating.

Highlights

  • 80 PLUS certification delivers up to 80% efficiency
  • Single +12V rail with DC-DC design provides stable voltage
  • 120 mm FDB fan and vented steel shell optimise thermal control
  • Compact 140 mm length fits small-form-factor builds
  • Five protection circuits safeguard against over-voltage, overload and short-circuit

Specifications

BrandRosewill
ModelVNW550
Maximum Power550 W
Fans1 x 120 mm
PFCActive
Main Connector24Pin
+12V RailsSingle
PCI-Express Connector2 x 6+2-Pin
SATA Power Connector6
Max PSU Length140 mm
ModularNon-Modular
Hold-up Time16ms min.
EfficiencyUp to 80%
Energy-Efficient80 PLUS 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
6 x 15-Pin SATA Connector
2 x 4-Pin Peripheral Connector
Shipping weight1.70 kg
Package size234 × 198 × 99 mm

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Questions about this item

How loud does the 120 mm FDB fan get when the 550 W unit runs all day?

The 120 mm FDB silent fan is designed for low-noise operation; the steel shell with large vents and optimized thermal control keeps airflow steady during continuous load.

Which cables are permanently attached since the PSU is non-modular?

Fixed cables include a 20+4-pin main connector, two 4+4-pin ATX12V/EPS12V connectors, two 6+2-pin PCI-E connectors, six SATA connectors and two 4-pin peripheral connectors.

Will the 140 mm long chassis fit alongside an older ATX motherboard that uses a 24-pin main power socket?

Yes, the 140 mm depth and 20+4-pin main connector match standard ATX dimensions, so it installs in older cases and works with legacy 24-pin motherboards.

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