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Rectangular black ATX power supply unit with fixed cables and 120mm fan grille

Seasonic

Seasonic SSR-500GB3 500W 80+ Bronze power supply

SKU CH-R0MD-00XKR MPN SSR-500GB3

Delivers 500 W through a single +12 V rail with 80 PLUS Bronze efficiency and a 120 mm sleeve-bearing fan controlled by S2FC for quiet operation

  • Max wattage500 W
  • Modular cablingNon-Modular
  • Fan configuration120 mm Sleeve Bearing Fan
  • Power factor correctionActive
  • Main power connector20+4Pin
  • 12V railsSingle

Model ATX 80+ Bronze (500W)

  • 80 PLUS Bronze certification delivers 85 % efficiency at 50 % load
  • Single +12 V rail supplies 40 A for stable GPU power
  • 120 mm fan with Smart Silent Fan Control balances cooling and noise
  • 105 °C Japanese capacitors ensure long-term reliability
  • 140 mm compact length fits most ATX cases

500 W ATX power supply for mainstream builds

The Seasonic S12III Bronze series unit delivers 500 W of continuous power through a single +12 V rail rated at 40 A. It fits standard ATX bays with a 140 mm depth and uses fixed cabling that includes a 20+4 pin main connector, two 6+2 pin PCIe connectors and four SATA power plugs. Over-voltage, under-voltage, over-power and short-circuit protection circuits guard connected components.

Fixed cable set and S2FC fan control

The non-modular loom supplies every cable a typical system needs, eliminating the need to source extra leads. A 120 mm double ball bearing fan runs under Smart and Silent Fan Control, adjusting speed to thermal load so the unit stays quiet during light work and ramps up only when the system demands it. Japanese 105 °C capacitors on the primary side help maintain stable output over long operating periods.

80 PLUS Bronze efficiency at 50 % load

The power supply meets 80 PLUS Bronze certification, reaching 85 % efficiency at 50 % load and 82 % at both 20 % and 100 % load. This reduces waste heat and lowers running costs compared with uncertified units. Input voltage ranges from 110 V to 240 V at 50 Hz or 60 Hz, making it suitable for worldwide use without a voltage switch.

How it compares

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

Price $63.99
Cheaper than about 83% of the 10,869 comparable items (median $142.99).
Max wattage 500 W
Lower than about 84% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic
Product lineS12III Bronze Series
Model nameS12III-500 GB (SSR-500GB3)
Product typeIntel ATX 12 V
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors4
Output type+3.3 V@20A, +5 V@20A, +12 V@40A
Connection types1 x Main Power (24/20 pins)
1 x CPU (8/4 pins)
2 x PCIe (8/6 pins)
4 x SATA
3 x Peripheral
1 x Floppy
Power
Max wattage500 W
Modular cablingNon-Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS BRONZE Certified
Overvoltage protectionYes
Supply voltage110–240 V
AC input frequency50/60 Hz
Rated input current8–4 A
Size & build
Product dimensions3.39 in × 5.51 in × 5.91 in
Shipping weight2.02 kg
Package size267 × 201 × 102 mm
Compatibility
PSU length limit140 mm
Environment & compliance
Regulatory approvalsSafety and EMC: cTUVus, TUV, Gost-R, UkrTEST, CB , BSMI, Semko, CCC, CE, FCC, C-tick
Environmental Compliance: Energy Star, RoHS, WEEE, REACH
More details
Fan configuration120 mm Sleeve Bearing Fan
Mean time between failures>100,000 h

Other versions of this model

1 more in the same range

Questions about this item

When will the 120 mm sleeve bearing fan need replacement?

The fan is rated for more than 100,000 hours of operation, so replacement is unlikely during normal use.

What limits continuous output at full 500 W load?

The single +12 V rail delivers up to 40 A and efficiency drops to 82 % at 100 % load, increasing heat inside the unit.

How loud and hot does the PSU get when running all day?

The S2FC fan control adjusts the 120 mm sleeve bearing fan speed to balance noise and cooling, while 85 % efficiency at 50 % load keeps waste heat moderate.

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