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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

  • TypeATX 3.0 Compatible
  • Maximum Power850 W
  • Fans1 x 120 mm FDB Fan
  • PFCActive
  • PCI-Express ConnectorPCIe 6+2pin x 4 PCIe 12+4pin (450W) x 1
  • Max PSU Length150 mm

Options 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.

Highlights

  • 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

Specifications

BrandThermaltake
ModelSPD-850AH2CLB
Part NumberPS-SPD-0850MNFABU-3
TypeATX 3.0 Compatible
Maximum Power850 W
Fans1 x 120 mm FDB Fan
PFCActive
PCI-Express ConnectorPCIe 6+2pin x 4
PCIe 12+4pin (450W) x 1
Max PSU Length150 mm
ModularSemi-Modular
Power Good Signal100-150 msec
Hold-up Time> 17msec
Energy-EfficientMeet 80 PLUS® Bronze at 115Vac input
ProtectionOCP/OVP/UVP/OPP/OTP/SCP
MTBF100,000 hrs minimum
ApprovalsCE/UKCA/LVD/UKCA/FCC/ICES/TUV/CB/cTUVus/BSMI/CCC
Dimensions150mm(W)x86mm(H)x140mm(D)
Weight1.7 KG
Shipping weight1.63 kg
Package size279 × 216 × 127 mm

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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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