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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

  • TypeIntel ATX 12 V
  • Maximum Power500 W
  • Fans120mm Sleeve Bearing Fan
  • PFCActive
  • Main Connector20+4Pin
  • +12V RailsSingle

Options 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.

Points forts

  • 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

Caractéristiques

BrandSeaSonic
SeriesS12III Bronze Series
ModelS12III-500GB (SSR-500GB3)
TypeIntel ATX 12 V
Maximum Power500 W
Fans120mm Sleeve Bearing Fan
PFCActive
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector2 x 6+2-Pin
SATA Power Connector4
Max PSU Length140 mm
ModularNon-Modular
Energy-Efficient80 PLUS BRONZE Certified
Over Voltage ProtectionYes
Input Voltage110 - 240 V
Input Frequency Range50/60 Hz
Input Current8 - 4 A
Output+3.3V@20A, +5V@20A, +12V@40A, [email protected] , [email protected]
MTBF>100,000 Hours
ApprovalsSafety and EMC: cTUVus, TUV, Gost-R, UkrTEST, CB , BSMI, Semko, CCC, CE, FCC, C-tick
Environmental Compliance: Energy Star, RoHS, WEEE, REACH
Connectors1 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
Features80 PLUS Bronze Certified High Efficiency
Highly Reliable 105 °C Japanese Brand Capacitor
Ample + 12 V Outputs
Active Power Factor Correction (99 % PF Typical)
LLC resonant converter design
Smart & Silent Fan Control (S2FC)
120 mm Fluid Dynamic Bearing (FDB) Fans
Soft-Mount Rubber Cushions
Patented Easy Swap Connector
Universal AC Input (Full Range)
Ultra Ventilation (Honeycomb Structure)
Dimensions3.39" x 5.51" x 5.91"
Poids d’expédition2.02 kg
Dimensions du colis267 × 201 × 102 mm

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Questions sur cet article

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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