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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

  • Max wattage550 W
  • Power efficiencyUp to 80%
  • Modular cablingNon-Modular
  • Fan configuration1 × 120 mm
  • Power factor correctionActive
  • Main power connector24Pin

Wattage 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.

How it compares

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

Price $34.99
Cheaper than about 94% of the 10,869 comparable items (median $142.99).
Max wattage 550 W
Lower than about 82% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameRosewill
Model nameVNW550
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors6
Output type+3.3 V@18A, +5 V@18A, +5VSB@3A
Connection types1 × 20+4-Pin Main Connector
2 × 4+4-Pin ATX12 V / EPS12 V Connector
2 × 6+2-Pin PCI-E Connector
6 × 15-Pin SATA Connector
2 × 4-Pin Peripheral Connector
Power
Max wattage550 W
Power efficiencyUp to 80%
Modular cablingNon-Modular
Power factor correctionActive
Main power connector24Pin
12V railsSingle
Power hold-up time16 ms min.
Efficiency certification80 PLUS Certified
Overvoltage protectionYes
Overload protectionYes
Size & build
Shipping weight1.70 kg
Package size234 × 198 × 99 mm
Compatibility
PSU length limit140 mm
More details
Fan configuration1 × 120 mm

Other versions of this model

2 more in the same range

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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