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Rectangular black ATX power supply unit with side-mounted 120 mm fan and modular cable sockets

Thermaltake

Thermaltake Smart BM3 850W PS-SPD-0850MNFABU-3 power supply

SKU CH-XE12-3VGQP MPN PS-SPD-0850MNFABU-3

ATX 3.0 compatible 850 W semi-modular PSU with 80 PLUS Bronze efficiency, a 120 mm FDB fan, Japanese 105°C capacitor and a PCIe 12+4pin connector rated for 450 W

  • Max wattage850 W
  • Modular cablingSemi-Modular
  • Fan configuration1 × 120 mm FDB Fan
  • Power factor correctionActive
  • PCIe power connectorsPCIe 6+2pin x 4 PCIe 12+4pin (450 W) x 1
  • PSU length limit150 mm

Model ATX 3.0 80+ Bronze (850W)

  • 850 W output meets Intel ATX 3.0 specifications
  • PCIe 12+4pin connector rated 450 W for Gen 5.0 graphics cards
  • 80 PLUS Bronze efficiency at 115 Vac input
  • Japanese 105°C main capacitor ensures long-term reliability
  • Semi-modular design with 120 mm FDB fan keeps cables tidy

Smart BM3 850W ATX 3.0 power supply

This semi-modular unit delivers 850 W of continuous power and meets 80 PLUS Bronze efficiency at 115 V input. It is built around a single +12 V rail with DC-to-DC topology and uses a 105 °C Japanese electrolytic capacitor. The 120 mm fluid-dynamic-bearing fan runs quietly under load. It targets system builders moving to modern GPU platforms.

ATX 3.0 and PCIe 5.0 readiness

The power supply complies with Intel ATX 3.0 specifications and includes a native 12+4 pin PCIe 5.0 connector rated for 450 W alongside four 6+2 pin PCIe connectors. This replaces older units that lack the 12VHPWR interface and cannot handle transient spikes from current-generation graphics cards. The upgrade is worth it when a new GPU requires the 12+4 pin connection or when the previous PSU cannot sustain high transient loads.

150 mm depth semi-modular fit

At 150 mm long, 86 mm high and 140 mm deep, the chassis fits standard ATX cases with adequate clearance. Semi-modular cabling keeps the 24-pin ATX and EPS cables fixed while allowing PCIe and peripheral cables to be added as needed. The unit weighs 1.7 kg and carries a 100,000-hour MTBF rating. Protection circuitry covers OCP, OVP, UVP, OPP, OTP and SCP.

How it compares

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

Price $70.99
Cheaper than about 79% 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 nameSPD-850AH2CLB
Part numberPS-SPD-0850MNFABU-3
Product typeATX 3.0 Compatible
Ports & slots
PCIe power connectorsPCIe 6+2pin x 4
PCIe 12+4pin (450 W) x 1
Power
Max wattage850 W
Modular cablingSemi-Modular
Power factor correctionActive
Power good signal100-150 msec
Power hold-up time> 17msec
Efficiency certificationMeet 80 PLUS® Bronze at 115Vac input
Built-in protectionOCP/OVP/UVP/OPP/OTP/SCP
Size & build
Product dimensions150 mm(W)x86 mm(H)x140 mm(D)
Product weight1.7 KG
Shipping weight1.63 kg
Package size279 × 216 × 127 mm
Compatibility
PSU length limit150 mm
Environment & compliance
Regulatory approvalsCE/UKCA/LVD/UKCA/FCC/ICES/TUV/CB/cTUVus/BSMI/CCC
More details
Fan configuration1 × 120 mm FDB Fan
Mean time between failures100,000 hrs minimum

Other versions of this model

5 more in the same range

Questions about this item

Will the 150 mm depth fit in a standard ATX case?

The unit measures 150 mm deep, 86 mm high and 140 mm wide so it matches the typical ATX form factor used by most mid-tower cases.

Which cables are fixed and which can be removed during installation?

The 24-pin ATX, CPU 8-pin and PCIe 12+4pin cables are permanently attached; the four PCIe 6+2pin cables and peripheral leads are detachable.

How long is the 105 °C Japanese capacitor rated to last?

The main electrolytic capacitor is rated for 105 °C operation and the power supply carries a minimum MTBF of 100,000 hours.

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