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Power Supply

Cooler Master - MasterWatt 550 W 80+ Bronze Certified Semi-Modular ATX Power Supply

( 4.7 Average / 13 Ratings )



Cooler Master


MasterWatt 550

Part #

(or) MPX-5501-AMAAB-UK
(or) MPX-5501-AMAAB-AU
(or) MPX-5501-AMAAB-EU




550 W



Efficiency Certification

80+ Bronze


85% @ Typical Load


+3.3V@20A, +5V@20A, +12@45.8A, -12V@0.3A, +5VSB@3A

PCI-Express 6+2-Pin Connectors


Completed Builds Using This Part

See All Completed Builds


Merchant Base Promo Shipping Tax Availability Total
Amazon Canada $69.99 Free two-day shipping with Amazon Prime In stock $69.99
( 6 new from $69.99. Last updated 5 hours ago. )
Memory Express $69.99 $69.99+
Canada Computers $76.99 In stock $76.99+
Powertop $76.99 In stock $76.99+
Vuugo $86.75 Out of stock $86.75+
PC-Canada $87.99 Out of stock $87.99+
Newegg Canada Marketplace $112.61 $112.61+
* Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.ca at the time of purchase will apply to the purchase of this product.

Price History (Excluding Tax) History:


ultra700 12 points 14 months ago
from completed build Orange glow - Ryzen gaming PC

Excellent power supply. Would buy again.

lectrician1 19 points 10 months ago
from completed build My Savior

Low-noise first-time-builder recommended PSU.

Matt_B03 5 points 9 months ago

Solid semi modular power supply with a 5 year warranty. Quiet as well. Would recommend.

puffketeer 15 points 8 months ago

An excellent performer, and superb in terms of wattage-to-price. Plus it gives me ample headroom for when I decide to upgrade the CPU/GPU.

thrillhouse1988 21 points 7 months ago
from completed build The Fort Knight

Best bang for buck semi-modular PSU I could find. Looks good in the case and does the job. Glad that the cables were sleeved black!

Shiloh_ 14 points 7 months ago
from completed build Snowfall (First pc build)

Quiet and fits in any case

worstcaster 10 points 7 months ago
from completed build My Gaming Rig

It is proving power to my system with no problems, so far. This is my first build, so I maybe judging this harshly, but the cables seemed very stiff, which made cable management more difficult.

Erick_cassibo 4 points 6 months ago
from completed build Obvious newb is obvious

Certified, what more do you want?

dann20201 8 points 6 months ago

Really small PSU now that I look at it lol. Uses its own modular cables which is weird but at least the cables are all black. Not much to say.

Xez90 7 points 5 months ago
from completed build Budget workstation

Not sure i'd recommend this product. For £10 more you can pick up a Corsair PSU of the same specifications that has better contents.