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

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.