Toughpower SFX 850W
The Thermaltake Toughpower SFX 850W is a 850W SFX power supply rated 80+ Platinum, fully modular, with a 12V-2x6 connector for a modern graphics card. Independent lab testing puts it at standard+ for noise, averaging 37.4 dB(A) across the load range, 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 850W unit delivers 850W. This scores how well built and how liveable the Toughpower SFX 850W 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.
Measured in the lab
Everything else on this page is a specification the manufacturer published. These figures were measured from the Toughpower SFX 850W itself by Cybenetics, an independent test lab.
- Average efficiency
- 90.0%Averaged across the full load range
- Average noise
- 37.4 dB(A)Cybenetics grade standard+, averaged across the load range
- Zero-RPM mode
- YesThe fan stops entirely at low load
- Fan bearing
- Fluid dynamicWhat the fan spins on, and how long it lasts
Each figure is an average over more than 1,450 load combinations, which is not the same measurement as the 80+ Platinum badge on the box. That badge certifies the unit at a handful of fixed load points; this covers the whole range, including the light loads a desktop spends most of its time at. Lab figures exist for roughly a fifth of the units we track, so their absence on another page means that unit has not been through this lab, not that it did badly.
Other wattages in this range
The same Toughpower 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
- 850 W
- Efficiency
- 80+ Platinum
- Price per watt
- $0.202/W
Connectors
- Motherboard
- 20+4-pin
- CPU (EPS)
- 2 (4+4)
- PCIe
- 2 (6+2)
- 12V-2x6 / 12VHPWR
- 1 (12+4)
- SATA
- 8
- Molex (4-pin)
- 4
Physical
- Form factor
- SFX
- Depth
- 104 mm
- Fan size
- 92 mm
- Modularity
- Fully modular
Platform
- Built by
- Jiu Zhou Yang Guang Power Supply (HKC)
Electrical & Warranty
- Input voltage
- 100-240 V
- Part number
- PS-STP-0850FNFAPU-1
Compare the Toughpower SFX 850W 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 Toughpower SFX 850W
Every in-stock retailer offer we track, cheapest first.
| Retailer | Availability | Price | Updated | Buy |
|---|---|---|---|---|
| Amazon | In stock | $171.32 |  | |
| Newegg | In stock | $179.99 |  | |
| Adorama | In stock | $189.99 Free shipping |  |
The Toughpower SFX 850W starts from $171.32 across 3 retailers, which works out at $0.202/W. Prices update daily from live stock.
What the Toughpower SFX 850W can power
Compare all GPUs →The graphics cards this 850W unit meets the system requirement for, ranked fastest first at 4K, 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 4K. 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 |
|---|---|---|---|
| GeForce RTX 4090 Nvidia | 450 W | 850 W | +0 W |
| GeForce RTX 5080 Nvidia | 360 W | 850 W | +0 W |
| GeForce RTX 4080 Super Nvidia | 320 W | 750 W | +100 W |
| Radeon RX 7900 XTX AMD | 355 W | 800 W | +50 W |
| GeForce RTX 5070 Ti Nvidia | 300 W | 750 W | +100 W |
| Radeon RX 9070 XT AMD | 304 W | 750 W | +100 W |
| GeForce RTX 4080 Nvidia | 320 W | 750 W | +100 W |
| Radeon RX 7900 XT AMD | 300 W | 750 W | +100 W |
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