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Black rectangular ATX power supply with 120mm fan and sleeved cables

Corsair

Corsair CX550 CP-9020121-NA 550W power supply

SKU CH-HD5S-3E4WH MPN CP-9020121-NA

A 550 W ATX power supply with 80 Plus Bronze efficiency, a single +12 V rail, two PCIe 6+2 connectors, five SATA connectors and a thermally controlled 120 mm fan

  • Max wattage550 W
  • Fan configuration1 × 120 mm Thermally Controlled Rifle Bearing Fan
  • Power factor correctionActive
  • Main power connector24Pin
  • 12V railsSingle
  • PCIe power connectors2 × 6+2-Pin

Model CX Series (550W)

  • 80 PLUS Bronze certification reduces waste heat and lowers electricity draw
  • Thermally controlled 120 mm rifle-bearing fan keeps noise low across varying loads
  • Single +12 V rail design simplifies cable routing for modern GPUs and CPUs
  • Compact 140 mm depth fits smaller ATX cases without crowding components
  • 100 000 hour MTBF rating indicates long-term reliability under continuous operation

CX Series 550 W ATX supply

The Corsair CX550 is a 550 W ATX12V power supply built for mainstream desktop builds. It carries 80 Plus Bronze certification and active PFC for efficient power delivery. A single +12 V rail and LLC resonant topology with DC-to-DC conversion support modern CPUs and chipsets. The unit measures 140 mm in length.

Black sleeved cables and quiet fan

All cables feature black sleeving and connectors for a clean internal appearance. The thermally controlled 120 mm rifle-bearing fan adjusts speed with load to keep noise low. Included connectors are one 24-pin ATX, one EPS12V 4+4-pin, two PCIe 6+2-pin, five SATA and four PATA plugs. Over-voltage protection is built in.

Suits mid-range gaming and office PCs

This supply fits systems drawing up to 550 W with one or two graphics cards needing 6+2-pin power. Builds requiring more PCIe connectors, higher wattage or modular cabling should consider other models. The 100–240 V input works worldwide without a voltage switch. Approvals include UL, CE, TUV and RoHS compliance.

How it compares

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

Price $61.99
Cheaper than about 84% 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).

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Specifications

Product
Brand nameCORSAIR
Product lineCX Series
Model nameCX550
Product typeATX12 V / EPS12 V
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors5
Output type+3.3 V@25A, +5 V@20A, +5VSB@3A
Connection types1 × 24-pin ATX
1 x EPS12 V/ATX12 V (4+4)
2 x PCIe (6+2)
5 x SATA
4 x PATA
Power
Max wattage550 W
Power factor correctionActive
Main power connector24Pin
12V railsSingle
Efficiency certification80 PLUS BRONZE Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency47–63 Hz
Rated input current6.3–3.15 A
Size & build
Product dimensions5.91 in × 5.51 in × 3.39 in
Product weight3.81 lb (1.73 kg)
Shipping weight2.25 kg
Package size269 × 188 × 102 mm
Compatibility
PSU length limit140 mm
In the box
Included itemsCX Series ATX Power Supply
Power Cord
4 x Mounting Screws
Pack of Zip-ties
Warranty Document
Environment & compliance
Regulatory approvalsFCC, ICES, CE, UL, cUL, RCM, TUV, CB, CCC, BSMI, EAC, RoHS, WEEE, KC
More details
Fan configuration1 × 120 mm Thermally Controlled Rifle Bearing Fan
Mean time between failures100,000 h

Other versions of this model

5 more in the same range

Questions about this item

How long is the rifle-bearing fan rated to run before it may need replacement?

The fan is part of a unit with a 100000-hour MTBF, so the fan itself is designed for very long service life under normal loads.

What thermal limit triggers the fan to spin faster during sustained full-load operation?

The thermally controlled 120mm fan ramps speed based on internal temperature, keeping the unit within its 80 Plus Bronze efficiency envelope up to 550 W continuous output.

How much waste heat and noise does the supply produce when running at typical load all day?

At typical loads the 80 Plus Bronze efficiency keeps waste heat low, and the thermally controlled 120mm rifle-bearing fan stays quiet while maintaining safe temperatures.

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