# Cooler Master MasterWatt, 80+ Bronze Certified 550W Semi-fanless Modular Power Supply

- Category: Power Supply
- Brand: Cooler Master
- Model: MasterWatt
- Part number: MPX-5501-AMAAB-US
- Price (US): currently unavailable
- Price last checked: 2026-08-06
- Rating: 4.6/5 from 2378 Amazon reviews
- Warranty: 5 years
- Product page: https://buildmypc.net/component-details/power-supply/cooler-master-masterwatt-mpx-5501-amaab-us/

## Description

n/a

## Specifications

| Spec | Value |
| --- | --- |
| Brand | Cooler Master |
| Model | MasterWatt |
| Power | 550 W |
| Efficiency | 80+ Bronze |
| Color | Black |
| Form Factor | ATX |

## Key Features

- 550W semi-modular ATX power supply
- Semi-finless up till 15% load
- 80 plus bronze certified
- Temperature controlled 120 millimeter fan with dustproof LDB bearing
- 5 years
- Dc-to-dc circuit design for stable voltage output
- Thicker 16AWG Pie cables to support the latest graphics cards

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