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 SFX power supply with 80 Plus Platinum efficiency and ATX 3.1 compliance is for compact builds needing high-end GPU power.
This 850W SFX unit is a strong contender for compact, high-performance PC builds due to its 80 Plus Platinum efficiency and ATX 3.1/PCIe Gen 5.1 readiness. However, the reported cable length and rigidity issues, plus the single daisy-chained PCIe cable, mean you might need to invest in aftermarket cables or adapt your build plan.
If cable management is a top priority for your SFX build, look for PSUs explicitly advertising ultra-flexible or pre-sleeved short cables, or factor in the cost of custom cables.
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Pros
- Delivers 850 watts in an SFX form factor, fitting into small cases with dimensions of 125mm(W) x 63.5mm(H) x 103.8mm(D).
- Achieves 80 PLUS Platinum certification, indicating up to 92% efficiency.
- Includes a native PCIe 12V-2x6 connector capable of delivering up to 450W for PCIe 12+4pin graphics cards, meeting ATX 3.1 and PCIe Gen 5.1 standards.
- Features a 90mm fluid dynamic bearing fan with a Smart Zero Fan mode that keeps it off until 30% load.
- Comes with an SFX to ATX adapter bracket for broader case compatibility.
- Backed by a 7-year warranty.
Cons
- Cables are reported as too long for many SFX builds, making cable management difficult.
- Cables are not braided and are described as inflexible by users.
- The 850W model includes only one daisy-chained PCIe cable, which can be insufficient for GPUs requiring multiple dedicated PCIe connectors.
- Multiple connectors on a single cable can hinder clean aesthetics in a build.
Dimension Scores
The 850W output in an SFX form factor with 80 PLUS Platinum certification and ATX 3.1 compliance is top-tier for power delivery and efficiency.
The 90mm FDB fan with Smart Zero Fan mode ensures silent operation below 30% load.
Utilizes 100% high-quality Japanese 105°C electrolytic capacitors, indicating a focus on durability and stability.
User feedback consistently points to cables being too long, inflexible, and not braided, making clean routing challenging in SFX cases.
Best For
- Small Form Factor (SFX) PC builds with high-power GPUs (e.g., RTX 40 series) requiring a 12V-2x6 connector.
- Users prioritizing power efficiency, evidenced by the 80 PLUS Platinum certification.
- PC enthusiasts building in compact cases where a standard ATX PSU won't fit, but who still need 850W.
- Systems needing ATX 3.1 compliance for next-gen hardware stability.
Not Recommended For
- Users who prioritize pristine cable management without purchasing custom cables.
- Budget-conscious builders, as the Platinum efficiency and ATX 3.1 features command a higher price.
- GPUs that specifically require more than one dedicated PCIe power cable, as this unit only provides one daisy-chained option.
Watch Out For
- The included cables are often too long for SFX cases, forcing users to manage excess cable length or purchase custom shorter cables.
- Cable flexibility is a reported issue, making routing and bending difficult in tight SFX enclosures.
- The 850W version only has one daisy-chained PCIe cable, which might not be enough for GPUs needing multiple, separate PCIe power inputs, potentially preventing the GPU from powering on.
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
The biggest headache for builders using this SFX PSU seems to be the cables. Users report the cables are often too long for compact cases, making it a struggle to keep things tidy. The inflexibility and lack of braiding also contribute to cable management frustrations. Another specific issue highlighted is that the 850W model only provides one daisy-chained PCIe cable, which can be a dealbreaker for modern GPUs that demand multiple dedicated power inputs.
“Man, this thing powers my 4070 Ti Super in my tiny case, which is awesome, but I had to buy custom cables because the ones it came with were like spaghetti trying to fit in a shoebox. Seriously, Thermaltake, shorter cables for SFX, please!”
Common Praise
- Compact size fits well in SFX cases.
- Native 12V-2x6 connector for new GPUs.
- Fan stays off under light loads, keeping the system quiet.
- Includes an SFX to ATX adapter bracket for versatility.
Common Complaints
- Cables are excessively long for SFX builds.
- Cables are stiff and difficult to bend for routing.
- Only one daisy-chained PCIe cable is included with the 850W model.
- Multiple connectors on a single cable make for a less clean build.
Ownership Tips
- You'll likely spend extra time on cable management or budget for custom cables if you want a clean SFX build.
- Verify your GPU's exact PCIe power requirements; if it needs more than one dedicated cable, this PSU's single daisy-chained option might not work for you.
- The fan is genuinely silent at low loads, which is a plus for quiet computing.
- The SFX to ATX bracket is handy if you ever repurpose it for a larger build.
Frequently Asked Questions
Does this PSU come with an ATX adapter bracket?
Yes, it includes an SFX to ATX adapter bracket, so you can install it in cases designed for larger ATX power supplies if needed.
Is this power supply quiet during normal use?
It features a Smart Zero Fan mode, which means the 90mm fan remains off until the power supply reaches 30% load, contributing to silent operation during light tasks.
Can this power supply handle the latest graphics cards?
Yes, it is PCIe Gen 5.1 ready and fully compatible with ATX 3.1 standards, including a native 12V-2x6 connector that can deliver up to 450W for compatible GPUs.
Are the cables modular?
Yes, this is a fully modular power supply, meaning you only connect the cables you need, which helps reduce clutter in your PC build.
What kind of capacitors does this PSU use?
It uses 100% high-quality Japanese 105°C/221°F electrolytic capacitors, which are known for their durability and stability.
Buying Guide
When you're looking at power supplies, especially for small computers, you need to think about more than just wattage. The 'form factor' tells you if it'll even fit in your case. 'Efficiency rating' (like 80 Plus Platinum) means less wasted electricity and less heat, which is a big deal in tight spaces. Also, check the 'connectors' to make sure it has everything your graphics card and motherboard need, especially the newer 12V-2x6 for modern GPUs.
Wattage (850W)
This is the total power your PSU can deliver. Think of it like the horsepower of your car; you need enough to run all your components, especially your CPU and graphics card, without straining the system.
Form Factor (SFX)
This dictates the physical size of the power supply. SFX units are much smaller than standard ATX PSUs, essential for fitting into compact PC cases. If your case is small, you absolutely need an SFX unit.
80 Plus Platinum Certified
This certification indicates how efficiently the PSU converts AC power from your wall outlet into DC power for your components. Platinum means it's very efficient (up to 92%), wasting less energy as heat and potentially saving you a tiny bit on your electricity bill.
ATX 3.1 Standard & PCIe Gen 5.1 Ready
These are the latest industry standards for power supplies, ensuring compatibility and stable power delivery for current and future high-power graphics cards, particularly those with the new 12V-2x6 power connector. It's like having the latest USB standard for your devices.
Alternatives
If this unit's cables are a concern, look for SFX PSUs with shorter, more flexible, individually sleeved cables. If your GPU needs multiple dedicated PCIe power inputs, consider an SFX PSU that explicitly states it provides more than one non-daisy-chained PCIe cable.
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