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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
Alternate Belgium €64.90 +€3.99 s/h In stock €68.89
Paradigit €69.99 +FREE s/h €69.99
Bytes At Work €71.00 +€3.95 s/h €74.95

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.