The SilverStone Nightjar ST45NF fan-less power supply supports the ATX12V v2.3 and EPS12V standards and is rated for a combined, continuous output power of up to 450 watts (500W peak) when operating at 230 VAC. Note: When operating on 115 VAC line power, the combined, continuous output capacity is limited to 400W (450W peak). The DC output specifications also require an ambient air temperature of 25°C or less (internal case air temperature), which is considerably lower than what is typically needed by the majority of fan-cooled PSUs.
The PSU includes universal AC line input (automatically adjusts the AC line voltage) and active PFC, which makes the unit more environmentally friendly. The ST45NF PSU provides a single +12V output rated for up to 35A (420W).
Specifications (from the SilverStone website)