Seasonic S12III (SSR-500GB3)

Home Power Supply Seasonic S12III

Product Specification

Connectivity
Total Connectors
1 x 20+4-Pin ATX Motherboard
1 x 4+4-Pin EPS CPU
2 x 6+2-Pin PCIe
4 x 15-Pin SATA
3 x 4-Pin Peripheral / Molex
PCIe Connector Distances : 21.7" / 550 mm
SATA Connector Distances : 17.7" / 450 mm
Peripheral Connector Distances : 17.7" / 450 mm
Floppy Connector Distances : 4.7" / 120 mm
ATX Connector Distance : 21.7" / 550 mm
EPS Connector Distances : 23.6" / 600 mm
Electrical
Total Wattage : 500 W
Number of +12 V Rails : 1
Combined Power for +12 V : 480 W
Max Load for +12 V : 40 A
Combined Power for +3.3/+5 V : 100 W
Max Load for +3.3 V : 20 A
Max Load for +5 V : 20 A
Max Power for +5 Vsb : 12.5 W
Max Load for +5 Vsb : 2.5 A
Max Power for -12 V : 3.6 W
Max Load for -12 V : 0.3 A
AC Input Power : 110 to 240 VAC, 50 / 60 Hz at 5 to 10 A
General
Efficiency Rating : 80 PLUS Bronze
Efficiency : 82 to 85% at 20 to 100% Load
Cooling
Fan Size : 120 mm
Bearing Type : Sleeve
Fan Life Expectancy : 30,000 Hours
Environmental
Operating Temperature : 104°F / 40°C
Physical
Form Factor : ATX
Compliance : ATX 12 V
Protection : Over-Power Protection, Over-Voltage Protection, Short-Circuit Protection, Under-Voltage Protection
Mean Time Between Failures (MTBF) : 100,000 Hours
Dimensions : 5.51 x 3.39 x 5.91" / 140 x 86 x 150 mm
Packaging Info
Package Weight : 4.42 lb
Box Dimensions (LxWxH) : 10.5 x 7.7 x 3.9"

Seasonic S12III 500, 80+ Bronze Certified 500W Power Supply with Silent Fan Control

  (1536 Total Review)

Product Features

  • Fixed cabling - Provides all the necessary cables required for a standard pc.
  • 80 plus Bronze - 82% efficient at 20% load, 85% efficient at 50% load, and 82% efficient at 100% load.
  • 120 mm SLEEVE BEARING FAN; The 120 mm fan inside is regulated by the Seasonic S2FC fan control, which optimizes the fan speed according to the needs of the system to create a quiet and pleasant environment.
  • 5 year warranty; Our commitment to superior quality.
Add Product to List
Amazon
Out of Stock · Last Checked At: Nov 9, 2026
View on Amazon
As an Amazon Associate, PC Builder earns from qualifying purchases. Prices and availability are as of the date shown and may change. Affiliate Disclosure

Product Specification

Connectivity
Total Connectors
1 x 20+4-Pin ATX Motherboard
1 x 4+4-Pin EPS CPU
2 x 6+2-Pin PCIe
4 x 15-Pin SATA
3 x 4-Pin Peripheral / Molex
PCIe Connector Distances : 21.7" / 550 mm
SATA Connector Distances : 17.7" / 450 mm
Peripheral Connector Distances : 17.7" / 450 mm
Floppy Connector Distances : 4.7" / 120 mm
ATX Connector Distance : 21.7" / 550 mm
EPS Connector Distances : 23.6" / 600 mm
Electrical
Total Wattage : 500 W
Number of +12 V Rails : 1
Combined Power for +12 V : 480 W
Max Load for +12 V : 40 A
Combined Power for +3.3/+5 V : 100 W
Max Load for +3.3 V : 20 A
Max Load for +5 V : 20 A
Max Power for +5 Vsb : 12.5 W
Max Load for +5 Vsb : 2.5 A
Max Power for -12 V : 3.6 W
Max Load for -12 V : 0.3 A
AC Input Power : 110 to 240 VAC, 50 / 60 Hz at 5 to 10 A
General
Efficiency Rating : 80 PLUS Bronze
Efficiency : 82 to 85% at 20 to 100% Load
Cooling
Fan Size : 120 mm
Bearing Type : Sleeve
Fan Life Expectancy : 30,000 Hours
Environmental
Operating Temperature : 104°F / 40°C
Physical
Form Factor : ATX
Compliance : ATX 12 V
Protection : Over-Power Protection, Over-Voltage Protection, Short-Circuit Protection, Under-Voltage Protection
Mean Time Between Failures (MTBF) : 100,000 Hours
Dimensions : 5.51 x 3.39 x 5.91" / 140 x 86 x 150 mm
Packaging Info
Package Weight : 4.42 lb
Box Dimensions (LxWxH) : 10.5 x 7.7 x 3.9"

Similar Products

Alternatives to the Seasonic S12III at a similar price

View all Power Supplies
Thermaltake PS-TPD-0850NNFAGU-3

Thermaltake PS-TPD-0850NNFAGU-3

  • 850 W
  • 80+ Gold
  • ATX
$79.99 View
Thermaltake SPD-0700NP

Thermaltake SPD-0700NP

  • 700 W
  • 80+
  • ATX
$54.99 View
Thermaltake SMART 600

Thermaltake SMART 600

  • 600 W
  • 80+
  • ATX
$42.99 View
Thermaltake PS-SPD-0500NPCWUS-W

Thermaltake PS-SPD-0500NPCWUS-W

  • 500 W
  • 80+
  • ATX
$39.99 View