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Black non-modular ATX 3.1 power supply, 140 mm long, flat etched cables, dual-colour H++ connector, 12 cm FDB fan

Thermaltake

Thermaltake Smart BX3 Pro 850W power supply PS-SPD-0850NNFABU-7

SKU CH-DFEZ-9F8PJ MPN PS-SPD-0850NNFABU-7

Non-modular ATX 3.1 unit with native PCIe 5.1 12V-2X6 connector, 80 Plus Bronze efficiency and 105 °C main capacitor

  • Max wattage850 W
  • Modular cablingNon-Modular
  • Fan configuration12 cm FDB Fan
  • Power factor correctionActive
  • PSU length limit140 mm
  • Power good signal100-150 msec
  • ATX 3.1 compliant for modern system stability
  • Native PCIe 5.1 12V-2X6 connector delivers up to 600W to new GPUs
  • 80 Plus Bronze certified efficiency reduces wasted power
  • 105°C main capacitor rated for 100,000 hours MTBF
  • Compact 140 mm length fits a wide range of cases

ATX 3.1 power supply for modern builds

This 850 W unit meets the Intel ATX 3.1 specification and includes a native PCIe 5.1 12V-2x6 connector rated for 600 W. It is built for users who need reliable, efficient power for current-generation graphics cards and CPUs. The non-modular design keeps cost down while the flat etched cables help routing in tight spaces.

Upgrade from older ATX 2.x units lacking 12V-2x6

If your existing supply follows the ATX 2.x standard and cannot deliver the 600 W PCIe connector required by newer GPUs, this model closes that gap. The jump is worth it when a graphics card upgrade demands the native 12V-2x6 interface and 850 W continuous output at 40 °C. The 80 Plus Bronze rating and 105 °C main capacitor add efficiency and longevity over many legacy Bronze units.

Check case clearance and cable routing before

The PSU length is 140 mm, so confirm your chassis supports that depth. Because the unit is non-modular, every cable is permanently attached; verify you have room to route the full set, including the flat etched PCIe and ATX leads. Input range covers 100 to 240 V at 50 or 60 Hz, matching standard mains worldwide.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $74.99
Cheaper than about 77% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameThermaltake
Model nameSmart BX3 Pro 850 W
Part numberPS-SPD-0850NNFABU-7
Product colorBlack
Product typeATX 3.1
Ports & slots
Output type+3.3 V@18A, +5 V@18A, +5VSB@3A
Connection types1 × 12VHPWR (12+4) PCIe / 1 × 24 pin ATX / 2 × 8 pin (4+4) EPS (CPU) / 3 × 8 pin (6+2) PCIe / 4 × 4 pin Peripheral / 4 x SATA
Power
Max wattage850 W
Modular cablingNon-Modular
Power factor correctionActive
Power good signal100-150 msec
Power hold-up time> 17msec at 80% load
Efficiency certification80 PLUS BRONZE Certified
Built-in protectionOCP/OVP/OPP/OTP/UVP/SCP
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current15A-6A
Size & build
Product dimensions150 × 140 × 86 mm
Shipping weight2.31 kg
Package size279 × 216 × 122 mm
Compatibility
PSU length limit140 mm
Environment & compliance
Regulatory approvalsCE/UKCA/LVD/UKCA/FCC/ICES/TUV/CB/cTUVus/BSMI/CCC
More details
Fan configuration12 cm FDB Fan
Mean time between failures100,000 hrs minimum

Questions about this item

What case clearance does the 140 mm length require?

The unit measures 140 mm long, so any ATX case with at least that depth will accept it without interfering with drive cages or the motherboard tray.

How do I confirm the PCIe 12V-2x6 connector is fully seated?

Push the matcha dual-colored H++ connector until the green band disappears; the colour change shows the latch has engaged and the 600 W link is secure.

When should the 105°C main capacitor be considered for replacement?

The capacitor is rated for 100,000 hours minimum MTBF at 105 °C; plan a preventive swap once the supply approaches that service interval.

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