Thermaltake Toughpower SFX 850W 80Plus Platinum ATX 3.1 Standard Power Supply; 450W 12V-2x6 Connector Included; Full Modular; 90mm FDB Fan; PS-STP-0850FNFAPU-1; 7 Year Warranty
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AI Verdict
This 850W 80Plus Platinum SFX power supply with ATX 3.1 and PCIe Gen 5.1 is for compact builds needing modern power delivery.
This PSU is a strong fit for specific small form factor builds that need 850W and the latest ATX 3.1/PCIe Gen 5.1 compatibility. Its compact dimensions (125mm W x 63.5mm H x 103.8mm D) and native 12V-2x6 connector are key advantages for modern SFF systems with powerful GPUs. However, cable issues and reported reliability concerns make it a situational choice.
If you need more robust protection testing results or more flexible cabling out of the box, look for SFX PSUs with a stronger track record in professional reviews for protection features and better bundled cables.
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Pros
- Meets ATX 3.1 and Intel SFX 12V 4.1 standards for next-gen hardware compatibility.
- Includes a native 450W 12V-2x6 connector for PCIe 5.1 graphics cards.
- Achieves 80 PLUS Platinum efficiency, converting power efficiently up to 92%.
- Features a 90mm fluid dynamic bearing fan with Smart Zero Fan mode, keeping it silent under 30% load.
- Maintains low ripple noise (<30mV) and strict voltage regulation (<±2%).
- Backed by a 7-year warranty.
Cons
- Cables can be too long for some small form factor cases, making cable management difficult.
- The 24-pin cable is reported as short (just under 14 inches) and inflexible for some builds.
- Only comes with one daisy-chained PCIe cable for non-12V-2x6 GPUs, which might be insufficient for multi-GPU setups.
- Some users report the fan can become noisy under load despite the Smart Zero Fan feature.
- Professional testing has shown some units failing protection testing (OPP and OTP).
Dimension Scores
This dimension is not applicable to a power supply unit.
While it has a 7-year warranty, there are user reports of a unit failing after 10 months and professional testing indicating failures in protection mechanisms (OPP, OTP).
850W is a high capacity for an SFX unit, sufficient for most single high-end GPU systems in a compact build.
It's fully compatible with ATX 3.1 and PCIe Gen 5.1 standards, including a native 12V-2x6 connector, making it highly compatible with current and future hardware.
Best For
- Small Form Factor (SFF) PC builds requiring high wattage in a compact size.
- Systems with a single high-end PCIe Gen 5.1 graphics card like an RTX 40 series.
- Users prioritizing power efficiency and low ripple noise for stable system operation.
- New PC builds aiming for future compatibility with ATX 3.1 and PCIe 5.1 standards.
Not Recommended For
- Budget-conscious builders, as its price point is on the higher end.
- Multi-GPU setups due to limited PCIe connector options beyond the 12V-2x6.
- Users who need extremely flexible or braided cables without buying custom sets.
Watch Out For
- The included cables might be too long for some SFF cases, leading to cluttered builds.
- The 24-pin cable is reported to be just under 14 inches, which can be too short for routing in certain SFF chassis.
- Some users have reported the fan becoming noisy when the PSU is under significant load.
- One user reported a unit dying after 10 months of use.
- Professional reviews have noted units failing Over Power Protection (OPP) and Over Temperature Protection (OTP) tests.
Full Specifications
| ASIN | B0D2851VQD |
| Brand | Thermaltake |
| Color | Black |
| Series | Toughpower SFX 850W |
| Voltage | 120 Volts |
| Wattage | 850 watts |
| Model Name | Toughpower SFX 850W |
| Form Factor | SFX |
| Item Weight | 3 pounds |
| Manufacturer | Thermaltake |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 850 |
| Item model number | SFX-0850AH8FLP |
| Compatible Devices | PC |
| Product Dimensions | 4.05 x 4.9 x 2.5 inches |
| Item Dimensions LxWxH | 4.05 x 4.9 x 2.5 inches |
| Item dimensions L x W x H | 4.05 x 4.9 x 2.5 inches |
What Buyers Say
This Thermaltake SFX 850W PSU is pretty new, so there aren't tons of user reviews yet, but the ones out there point to some specific issues. The biggest surprise is that despite its compact SFX form factor, some users found the cables too long for their small cases, while the 24-pin was too short for others. There's also a concerning report of a unit failing after 10 months and some professional tests showing protection failures. People do like the quiet operation at low loads and the future-proofing with ATX 3.1 and PCIe Gen 5.1.
“Man, I bought this for my tiny build and the cables are a nightmare, like, too long for some spots and the 24-pin is barely reaching, makes me want to just buy custom ones. It's quiet when I'm just browsing, but when I game, I can definitely hear that fan kick in. Hope it lasts longer than my last PSU, heard some bad stuff about these failing.”
Common Praise
- Fan is dead silent at low power draw due to Smart Zero Fan mode.
- Native 12V-2x6 connector is ready for new NVIDIA 40-series GPUs.
- 80 PLUS Platinum efficiency helps reduce heat and power loss.
- Compact SFX form factor fits well in small cases.
- Fully modular design helps with cable management, despite cable length issues.
Common Complaints
- Included cables are stiff and can be difficult to route in tight SFF cases.
- The 24-pin cable length (under 14 inches) can be problematic for some SFF builds.
- Only one daisy-chained PCIe cable is provided, limiting options for multiple older GPUs.
- Fan can become audible and potentially noisy under heavy system load.
- Reports of units failing protection tests (OPP and OTP) in professional reviews.
- One user experienced a unit failure after 10 months of use.
Ownership Tips
- You might end up buying custom cables to get a clean look in your SFF case because the included ones are either too long or too short in specific spots and not very flexible.
- The fan is genuinely quiet during light desktop use, but expect it to make some noise once your system is under a gaming or heavy workload.
- If you're running a GPU that needs multiple 8-pin PCIe connectors (and isn't using the 12V-2x6), you'll be stuck with a single daisy-chained cable, which isn't ideal for power delivery or aesthetics.
- Keep an eye on its performance; there are isolated reports of units failing within a year, which is a bummer for a Platinum-rated PSU.
Frequently Asked Questions
Is this power supply quiet?
It features a Smart Zero Fan mode, meaning the fan won't spin until the load hits 30%, keeping it silent during light use. However, some users have reported that the fan can get noisy under heavier loads.
What kind of cables does it come with?
It's fully modular and includes a native 12V-2x6 (12+4pin) connector for modern graphics cards. The other low-profile cables are reported to be somewhat inflexible and potentially too long for some SFF cases, or too short for the 24-pin in others.
Can I use this for multiple graphics cards?
While it has 850W, it only comes with one daisy-chained PCIe cable in addition to the 12V-2x6, which might not be enough for multi-GPU setups requiring multiple dedicated PCIe power connectors.
What are the dimensions of this PSU?
The Toughpower SFX Platinum measures 125mm(W) x 63.5mm(H) x 103.8mm(D), making it suitable for small form factor cases.
Does it work with older components?
Yes, ATX 3.1 is backward compatible, so it will work with older motherboards and graphics cards that use standard 8-pin PCIe connectors, though its primary benefit is for newer hardware.
Buying Guide
When you're looking at a power supply, especially for a compact PC, you need to think about more than just wattage. The 'SFX' part means it's small, designed for tiny cases, so check your case's compatibility first. 'ATX 3.1' and 'PCIe Gen 5.1' mean it's built for the newest graphics cards and power standards, which is a big deal for future-proofing your build. Also, 'fully modular' cables mean you only plug in the ones you need, which is a lifesaver for cable management in small spaces.
850W
This is the maximum power the unit can deliver. For most high-end single-GPU gaming PCs, 850W is plenty, ensuring your components get stable power even under heavy load. Think of it like the engine size in a car – more wattage means more potential power for your system.
80Plus Platinum
This certification indicates how efficiently the PSU converts AC power from your wall into DC power for your PC. Platinum is a high rating (up to 92% efficiency), meaning less wasted energy as heat, lower electricity bills, and a cooler-running system. It's like getting better gas mileage for your computer.
ATX 3.1 / PCIe Gen 5.1 with 12V-2x6 Connector
These are the latest power standards, specifically designed for modern, power-hungry graphics cards. The 12V-2x6 connector is a dedicated cable for GPUs like the NVIDIA RTX 40-series, ensuring they receive stable power without needing adapters, which can be a fire hazard. It's like having a dedicated, high-speed lane for your graphics card's power needs.
SFX Form Factor
This refers to the physical size of the power supply. SFX units are much smaller than standard ATX PSUs, making them essential for Small Form Factor (SFF) PC cases. If you're building a compact system, you absolutely need an SFX power supply to fit.
Alternatives
If this PSU doesn't fit, look for other SFX units with similar wattage and ATX 3.1/PCIe Gen 5.1 compliance, but prioritize models with better-reviewed cable flexibility and a stronger track record for protection circuit reliability.
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