SFX 450W
The SilverStone SFX 450W is a 450W SFX power supply rated 80+ Bronze, non-modular. Independent lab testing puts it at standard++ for noise, meaning clearly audible under load. Full specs, quality score and current prices are below.
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 450W unit delivers 450W. This scores how well built and how liveable the SFX 450W 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: SFX is a fit decision, not a quality one.
Other wattages in this range
The same SFX platform at a different rating. A larger unit runs a smaller load perfectly well, so buy for the card you plan to fit.
Specifications
Output & Rating
- Continuous power
- 450 W
- Efficiency
- 80+ Bronze
- Price per watt
- $0.222/W
Connectors
- CPU (EPS)
- 1 (4+4)
- PCIe
- 1 (6+2)
- 12V-2x6 / 12VHPWR
- —
- SATA
- 3
Physical
- Form factor
- SFX
- Depth
- 100 mm
- Fan size
- 92 mm
- Modularity
- Non-modular
Measured Noise
- Cybenetics grade
- standard++
- What that means
- clearly audible under load
Platform
- Built by
- Sirfa
- Topology
- Double Forward
- Minor-rail regulation
- DC-DC
Electrical & Warranty
- Input voltage
- 100-240 V
- Part number
- SST-ST45SF-V3
Compare the SFX 450W 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 SFX 450W
Every in-stock retailer offer we track, cheapest first.
| Retailer | Availability | Price | Buy |
|---|---|---|---|
| Newegg | In stock | $99.99 |  |
The SFX 450W starts from $99.99 across 1 retailer, which works out at $0.222/W. Prices update daily from live stock.
What the SFX 450W can power
Compare all GPUs →The graphics cards this 450W 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 | +0 W |
| Radeon RX 9060 XT 8 GB AMD | 150 W | 450 W | +0 W |
| Intel Arc B570 Intel | 150 W | 450 W | +0 W |
| GeForce RTX 3050 6GB Nvidia | 70 W | 300 W | +150 W |
| Radeon RX 6500 XT AMD | 107 W | 400 W | +50 W |
| Intel Arc A380 Intel | 75 W | 300 W | +150 W |
| Radeon RX 6400 AMD | 53 W | 350 W | +100 W |
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