The OCZ StealthXStream 400 W is probably the best entry-level power supply we reviewed to date. It can not only deliver its labeled power at 47º C, but also presents a high efficiency of up to 85%, voltages very close to their nominal values (below 3% margin, while ATX spec allows up to 5%) and amazingly low noise and ripple levels. If you are building an entry-level or mainstream computer with a simple video card, this is one of the best options on the market and its low price makes it to have an unbeatable cost/benefit ratio.