Thermaltake Smart BX3 550W 80 Plus Bronze ATX 3.1 Power Supply

The Thermaltake Smart BX3 550W is a non-modular ATX 3.1 power supply designed for budget-conscious builders who need a dependable foundation for their desktop PC. Carrying the 80 Plus Bronze certification, it delivers up to 85% energy efficiency under typical load conditions, helping to reduce electricity waste and keep operating temperatures in check. Built to the ATX 3.1 specification, the Smart BX3 supports power excursion headroom of up to 200%, making it compatible with modern graphics cards that can draw brief transient power spikes beyond their rated TDP. The unit also meets ATX 3.1 timing and low-load efficiency requirements, including 60% efficiency at low loads. Cooling is handled by a 120mm fluid bearing fan, which operates quietly and offers longer service life than sleeve-bearing alternatives. A Smart Zero Fan mode keeps the fan completely stationary below a set load threshold, eliminating fan noise during light desktop use, media playback, or idle operation. The main filter capacitor is rated to 105°C (221°F), a specification associated with improved longevity and stability compared to standard 85°C capacitors. Power delivery relies on a single high-amperage +12V rail paired with a DC-to-DC converter circuit, which helps maintain stable voltages across all connected components. Protection circuitry includes Over Current Protection (OCP), Over Voltage Protection (OVP), Under Voltage Protection (UVP), Over Power Protection (OPP), Short Circuit Protection (SCP), and Over Temperature Protection (OTP). The unit ships with a 5-year warranty from Thermaltake. The non-modular flat cable design uses soft black cables to simplify routing and reduce clutter inside the chassis. — Verified Specifications — Wattage: 550W Certification: 80 Plus Bronze Form Factor: ATX 3.1 Modularity: Non-modular Fan: 120mm fluid bearing, Smart Zero Fan mode Main Capacitor Rating: 105°C Rail Design: Single +12V, DC-to-DC Connectors: 4× SATA, 4× Peripheral (4-pin), 2× PCIe (6+2-pin) Protections: OCP, OVP, UVP, OPP, SCP, OTP Warranty: 5 years GTIN: 4711475642942 SKU: PS-SPD-0550NNFABD-3