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MSI · 550 W · ATX

MSI MAG A550BN

ATX 2.3 · 80 PLUS Bronze · Fixed cables

Capability
55
Cap / price
110
Wattage value
88
Amazon
$50
MSI MAG A550BN
View MSI MAG A550BN Gallery in high resolution
$50
Available on Amazon Updated Aug 30, 2026 Prime FBA
Capability55.1
Capability / price110.3
Wattage value88.0
$50 on Amazon PSU table Compare this PSU

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Written analysis

MSI MAG A550BN at a glance

The MSI MAG A550BN is a 550 W ATX power supply built to the ATX 2.3 generation. Efficiency is listed as 80 PLUS Bronze. Cables are fixed.

The calculated capability score is 55.1, averaging the available wattage, recorded efficiency percentage, and warranty inputs against fixed references. Listed warranty is 5 years. +12V output is 45 A.

Best fit: Mainstream gaming and productivity builds where efficiency and cable management matter.

Platform and cooling

Dimensions are listed as 150 x 140 x 86 mm. Cooling fan size is 120 mm. The unit uses 1 +12V rail at up to 45.00 A per rail. Certifications include 80 PLUS® Standard.

Current value

At $50, price per kilowatt is $90.89. Capability / price is 110.3 and wattage value is 88.0. Compare nearby supplies below; wattage alone does not determine value.

Unit data

Full specifications

Wattage, efficiency, platform size, electrical outputs, connectors, cooling, and value in one technical sheet.

General

Manufacturer
MSI
PSU
MSI MAG A550BN
Launch price
—
Amazon price
$50
Amazon availability
Available
Price updated
Aug 30, 2026

Power & efficiency

Wattage
550 W
Efficiency
80 PLUS Bronze
Recorded efficiency
85%
Warranty
5 years

Value

Amazon price
$50
Price / kW
$90.89
Capability
55.1
Capability / price
110.3
Wattage value
88.0

Platform & size

ATX generation
2.3
Form factor
ATX
Dimensions
150 x 140 x 86 mm
Modular
No
Fanless
No

Electrical

Input voltage
100-240
+12V output
45 A
+5V output
20 A
+3.3V output
20 A
+12V rails
1
Max amps / rail
45.00 A

Cooling & build

Fan size
120 mm
Fan stop
No
Certifications
80 PLUS® Standard

Additional information

Also listed as
MAG A550BN

Amazon

Price history

Nearby capability

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Discussion

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Amazon listing details

Marketplace feature text kept for reference. Structured specifications above are the source for scores and comparisons.

80 PLUS Bronze CERTIFIED

5-year limited warranty, guaranteeing long term reliable operation

Low Noise Fan

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