S12III-500
The Seasonic S12III-500 is a 500W ATX power supply rated 80+ Bronze, non-modular. Independent lab testing puts it at standard+ for noise, meaning clearly audible under load. It is out of stock at the retailers we track right now, but the specs below still apply whenever it returns.
Prices update regularly and may differ at the retailer. This page contains affiliate links.
Quality score
How we score →A power supply has no performance benchmark: every 500W unit delivers 500W. This scores how well built and how liveable the S12III-500 is, out of 100, from six published factors.
Better always scores higher, but the steps are uneven on purpose: Bronze to Gold is worth 11 of the 25 efficiency points, Gold to Titanium only 6. A factor we hold no value for scores zero rather than being skipped, so a unit we know little about never outranks a fully specified one. That does mean a zero can mean either poor or unknown, which is what the confidence figure above is for. Physical size scores nothing: ATX is a fit decision, not a quality one.
Measured in the lab
Everything else on this page is a specification the manufacturer published. This figure was measured from the S12III-500 itself by Cybenetics, an independent test lab.
- Noise grade
- standard+clearly audible under load
Specifications
Output & Rating
- Continuous power
- 500 W
- Efficiency
- 80+ Bronze
Connectors
- Motherboard
- 20+4-pin
- CPU (EPS)
- 1 (4+4)
- PCIe
- 2 (6+2)
- 12V-2x6 / 12VHPWR
- —
- SATA
- 4
- Molex (4-pin)
- 3
Physical
- Form factor
- ATX
- Depth
- 140 mm
- Fan size
- 120 mm
- Modularity
- Non-modular
- Cable colour
- black
- Colour
- black
- RGB
- No
Electrical & Warranty
- Protections
- OPP, OVP, UVP, OCP, OTP, SCP
- Input voltage
- 100-240 V
- Input frequency
- 50-60 Hz
Compare the S12III-500 against every other unit on the power supply comparison table. Not sure how much wattage you need? The power supply guide works through the sizing.
Where to buy the S12III-500
Every in-stock retailer offer we track, cheapest first.
Currently out of stock
The S12III-500 isn’t in stock at the retailers we track right now. Prices refresh daily, so check back, or compare other in-stock units.
Browse in-stock power suppliesWhat the S12III-500 can power
Compare all GPUs →The graphics cards this 500W unit meets the system requirement for, ranked fastest first at 1080p, with the margin left over. The resolution follows the wattage, because a unit this size is bought for a card that will be run at 1080p. Headroom is measured against the card maker’s own whole-system recommendation, so 0 W means it meets that recommendation exactly rather than falling short.
| Graphics card | Card draw | PSU advised | Headroom |
|---|---|---|---|
| Radeon RX 9060 XT 16 GB AMD | 160 W | 450 W | +50 W |
| Radeon RX 9060 XT 8 GB AMD | 150 W | 450 W | +50 W |
| Intel Arc B570 Intel | 150 W | 450 W | +50 W |
| Radeon RX 6600 XT AMD | 160 W | 500 W | +0 W |
| Radeon RX 6600 AMD | 132 W | 500 W | +0 W |
| GeForce RTX 3050 6GB Nvidia | 70 W | 300 W | +200 W |
| Radeon RX 6500 XT AMD | 107 W | 400 W | +100 W |
| Intel Arc A380 Intel | 75 W | 300 W | +200 W |
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