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Rectangular black ATX power supply with 120 mm fan and modular cables visible

Cooler Master

Cooler Master MPX-5501-ACAAB-U1 550 W power supply

SKU CH-VMEX-HX6VR MPN MPX-5501-ACAAB-U1

A 550 W ATX power supply with a 120 mm fan, active PFC and 80 PLUS Bronze efficiency, fully modular with two 6+2-pin PCIe and four SATA connectors

  • Max wattage550 W
  • Power efficiency85% Typically
  • Fan configuration1 × 120 mm fan
  • Power factor correctionActive
  • Main power connector20+4Pin
  • PCIe power connectors2 × 6+2-Pin
  • 80 PLUS Bronze certification reduces wasted energy with 85% typical efficiency
  • 550 W continuous output powers mid-range builds through a single 12 V rail at 43 A
  • 120 mm LDB-bearing fan runs quietly while keeping temperatures low
  • Modular cables simplify builds by letting you connect only the 20+4-pin, 4+4-pin CPU, two 6+2-pin PCIe and four SATA leads you need
  • Compact 140 mm depth fits tight cases and leaves room for cable routing

Cooler Master MWE 550 W Bronze PSU

This Cooler Master MWE unit delivers 550 W through an Intel ATX 12V v2.31 design. It targets mainstream desktop builders who need reliable power for mid-range components. The 80 PLUS Bronze rating confirms typical efficiency of 85 %. A single 120 mm fan with a durable LDB bearing keeps noise low while the DC-DC circuit design provides stable voltage rails.

Check case clearance and cable needs before ordering

The power supply measures 140 mm in length so verify that your chassis can accommodate it. Ensure the motherboard accepts the 20+4 pin main connector and the 4+4 pin CPU connector. Two PCIe 6+2 pin cables support most mid-range graphics cards. Four SATA connectors and three peripheral 4-pin connectors cover typical storage and accessory requirements. Input voltage spans 100 to 240 V at 50 or 60 Hz for worldwide use.

Upgrade from older group-regulated

Replacing a group-regulated design with this DC-DC topology improves cross-load stability on the +12 V rail which delivers 43 A. The Bronze certification reduces waste heat compared to unrated supplies. Over-voltage and overload protection add safety for connected hardware. Hold-up time of 16 ms at 80 % load and a power-good signal of 100 to 500 ms meet standard ATX requirements. The MTBF rating exceeds 100 000 hours.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $52.99
Cheaper than about 90% of the 10,869 comparable items (median $142.99).
Max wattage 550 W
Lower than about 82% of the 930 comparable items (median 850 W).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameCooler Master
Product lineMWE Series
Model nameMPX-5501-ACAAB-U1
Product typeIntel ATX 12 V V2.31
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors4
Output type+3.3 V@22A, +5 V@20A, +12 V@43A
Connection typesMB 20+4 Pin x 1
CPU 12 V 4+4 Pin x 1
SATA x 4
Peripheral 4 Pin x 3
FDD Cable 4 Pin x 1
PCI-e 6+2 Pin x 2
Power
Max wattage550 W
Power efficiency85% Typically
Power factor correctionActive
Main power connector20+4Pin
Power good signal100-500 ms
Power hold-up time16 ms at 80% load
Efficiency certification80 PLUS BRONZE Certified
Overvoltage protectionYes
Overload protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current8–4 A
Size & build
Product dimensions5.9 in × 5.5 in × 3.39 in
Product weight4.2 lb (1.91 kg)
Shipping weight2.06 kg
Package size269 × 198 × 117 mm
Compatibility
PSU length limit140 mm
Environment & compliance
Regulatory approvalsTUV-RH, CE, CCC, KC, EAC, RCM, cTUVus, FCC, BSMI
More details
Fan configuration1 × 120 mm fan
Mean time between failures>100,000 h

Questions about this item

What cables are included and what must be purchased separately?

The box provides a 20+4-pin motherboard cable, a 12V 4+4-pin CPU cable, four SATA power plugs, three 4-pin peripheral plugs, one floppy-style 4-pin plug and two PCI-e 6+2-pin connectors. No extra cables are needed for a standard build.

How do I choose between the available versions or capacities?

This model is a single 550 W unit; there are no alternative wattage or capacity options to select from.

What does the 550 W rating mean once the unit is installed in a real system?

The 550 W label is the maximum continuous output. The +12 V rail delivers up to 43 A, the +5 V rail up to 20 A and the +3.3 V rail up to 22 A, with typical efficiency of 85 percent under load.

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