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Rectangular steel PSU in matte black with fixed flat cables and a 120mm fan grille

GIGABYTE

GIGABYTE GP-P550B power supply

SKU CH-HX73-8B476 MPN GP-P550B

550 W ATX 12V v2.31 unit with 80 PLUS Bronze efficiency, single +12 V rail, 120 mm hydraulic-bearing fan and full protection suite

  • Max wattage550 W
  • Power efficiency85% at typical load
  • Modular cablingNon-Modular
  • Fan configuration1 × 120 mm Silent Hydraulic Bearing (HYB) Fan
  • Main power connector20+4Pin
  • 12V railsSingle

Model ATX 80+ Bronze (550W)

  • 80 PLUS Bronze certified for 85% efficiency at typical load
  • Single +12V rail delivers stable power output for hardware compatibility
  • 120mm Silent Hydraulic Bearing fan adjusts speed for noise reduction
  • Flat cables reduce clutter and improve airflow inside the case
  • Multiple protections including OVP, OPP, SCP, UVP, OCP, OTP

Power for mainstream builds

The GIGABYTE GP-P550B is a 550 W ATX 12V v2.31 power supply built for standard desktop systems. It carries 80 PLUS Bronze certification with 85% efficiency at typical load. A single +12 V rail delivers stable power to the CPU and graphics card. The unit uses a non-modular design with flat cables to reduce clutter inside the case.

Compatibility checklist

Confirm your case accepts a power supply up to 140 mm in length and has room for the fixed cable bundle. The main motherboard connector is a 20+4 pin plug and two 6+2 pin PCIe connectors are provided for graphics cards. Three SATA power connectors are available for drives. Input voltage covers 100-240 V at 50/60 Hz for worldwide use.

Thermals and power behaviour

A 120 mm hydraulic bearing fan adjusts speed based on load to balance cooling and noise. The Bronze-rated efficiency reduces waste heat at normal loads. Protections include OVP, OPP, SCP, UVP, OCP and OTP. Hold-up time is at least 16 ms and the power good signal arrives within 100-500 ms.

How it compares

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

Price $55.99
Cheaper than about 88% 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 nameGIGABYTE
Model nameGP-P550B
Product typeATX 12 V v2.31
Graphics
SLI supportNo
CrossFire supportNo
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors3
Output type+3.3 V@18A, +5 V@15A, +5VSB@3A
Connection types1 x ATX/MB 20+4 Pin
1 x CPU/EPS 4+4 Pin
2 x PCI-e 6+2 Pin
6 x SATA
4 x Peripheral 4 Pin
1 x Floppy
Power
Max wattage550 W
Power efficiency85% at typical load
Modular cablingNon-Modular
Power factor correctionNo
Main power connector20+4Pin
12V railsSingle
Power good signal100-500 ms
Power hold-up time16 ms min.
Efficiency certification80 PLUS BRONZE Certified
Built-in protectionOVP / OPP / SCP / UVP / OCP / OTP
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current8–4 A
Size & build
Product dimensions3.39 in × 5.91 in × 5.51 in
Shipping weight2.27 kg
Package size305 × 203 × 152 mm
Compatibility
PSU length limit140 mm
More details
Fan configuration1 × 120 mm Silent Hydraulic Bearing (HYB) Fan
Mean time between failures>100,000 h

Other versions of this model

4 more in the same range

Questions about this item

What cables come attached and what must I add?

The unit ships with a fixed 20+4 pin main connector, two 6+2 pin PCIe plugs and three SATA power leads; no modular cables are included so nothing extra can be added.

How do I decide if the 550 W bronze unit fits my build?

Pick this 550 W model when your peak system draw stays below the rated maximum; the single +12V rail and 85% typical efficiency suit mid-range gaming or workstation configurations.

What does the 85% efficiency figure mean once installed?

At typical load the PSU converts 85% of wall power into usable DC output, so less energy becomes heat and the 120 mm hydraulic fan runs quieter.

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