Super Flower Amazon 650W Power Supplyby Christoph Katzer on October 16, 2008 3:00 AM EST
- Posted in
Efficiency and PFC
Super Flower claims this is a high efficiency power supply, and indeed we see up to 87% with 230VAC input. The curve is typical of most power supplies, starting low and reaching its peak at around 50% load. Maximum efficiency regardless of input is at around 300W, and depending on input voltage you will want a minimum load of 100W to 125W in order to stay above 80% efficiency. 80Plus Bronze certification requires a minimum efficiency of 82% at 20% and 100% load, and 85% efficiency at 50% load; the Super Flower Amazon 650W does meet those requirements, but only with 230VAC; 120VAC appears to barely miss the mark, although we're probably splitting hairs.
The power factor correction is one of the best we have seen in recent time. With lower input voltages, you will have an almost constant PFC of more than .99.