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Cooler Master Master Watt 550 Watt Semi-Fanless Silencio Fan, Semi-Modular 80 PLUS Bronze Power Supply

In stock. Limit 10 per customer.
Ships from United States.
  • 1300W
  • 1000W
  • 850W
  • 750W
  • 650W
  • 600W
  • 550W
  • 500W
  • 450W
  • 1
  • 1 x 120 mm
  • 1 x 135 mm
  • Full Modular
  • Non-Modular
  • Semi-Modular
  • MWE
  • MWE Gold
  • MWE White
  • MasterWatt TUF
  • MasterWatt
  • Semi-Fanless up till 15% load
  • Dual Forward and DC-to-DC circuit design
  • More Conductive PCI-e Cables
  • 80 PLUS Bronze Certified
  • Durable LDB bearing
MasterWatt 550 Watt
High Efficiency. Smart Fan. Modular Design.

The COOLER MASTER MasterWatt series power supplies power your PC components at an efficiency level of 80 PLUS Bronze – RELIABLY and STABLY. The LDB bearing fan delivers high cooling capacity during high power output, and stops spinning under 15% load. With a modular design, you can plug in the power cables only needed. No more mess inside your case.

80 PLUS Bronze Certified

The 80 PLUS Bronze certification guarantees that MasterWatt delivers an average efficiency of 85%.

Durable LDB Bearing

Cooler Master 120mm Silencio FP fan combines sealed LDB bearings with quiet fan blades, offering a long lifetime of quiet cooling.

  • A: The groove outside of the bearing helps to circulate the oil
  • B: Sealant on the bobbin ensures the highest level of dustproof - IP6X
  • C: Recycle slot adds extra storage space for the oil
  • D: The shaft makes the oil flow by pumping it while spinning
Semi-Fanless up to 15% Load

MasterWatt Operates at 0dB under 15% load. Experience noise-free basic computing.

Dual Forward and DC-to-DC Circuit Design

The Dual Forward and DC-to-DC circuit design offers reliability and stability. This is especially significant in +3.3V and +5V outputs.

More Conductive PCI-e Cables

The MasterWatt uses 16 AWG PCI-e cables. Less resistance and better efficiency provide you with a safer user environment.

Warranty & Returns

Warranty, Returns, And Additional Information


  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years
  • Read full details

Return Policies

    We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1, 2022 and December 25, 2022 you will have until January 31, 2023 to return your product. There's nothing additional that you have to do!
  • Return for refund until: January 31, 2023
  • Return for replacement until: January 31, 2023
  • This item is covered by's Extended Holiday Return Policy. Read full return policy for details.