So, dann nehmen wir doch mal die passende Review dazu:
AnandTech: Super Flower Amazon 650W Power Supply
Conclusion
From what we saw during testing, the Super Flower Amazon PSU appears to be a very good product. Of course, since this looks like a preproduction unit we can't say for sure how it will compare with actual retail models made on the standard factory lines. Super Flower says the unit we received should be representative of stock units, and if so that's great; we will make sure to get our hands on a retail unit for comparison once they begin shipping.
http://images.anandtech.com/reviews/psu/2008/super-flower-amazon-650w/table_end.png In terms of feature set, there's nothing truly remarkable with the Amazon series. It's a typical power supply with no funny gimmicks; the only really noteworthy feature is the 140mm fan. It provides very good voltage distribution, good efficiency, and very silent operation. The build quality is very good as well, even though we don't like to see large amounts of glue all over the place. The length of the housing might be a little long for a 650W power supply, but that's because Super Flower uses the same topology for all of the power supplies in this series. They selected high-quality components, and the result is a very good power supply. The number of connectors is good for a 650W unit, allowing users to power up to two of the most powerful GPUs currently on the market. Cable lengths are also decent, with 50cm ATX connectors and PEG connectors at 50cm and 65cm.
The overall performance is very good, surpassing much of the competition that has been around for a while. Voltage regulation was good on the six important 12V rails. The 3.3V provides a constant high voltage of up to 3.47V while the 5V rail is almost the opposite with somewhat low results under higher loads. The efficiency reaches up to 87% with 230VAC and up to 85% with 120VAC.
The temperatures inside of the power supply were very low, reaching only 50°C with normal ambient room temperature. The fan spins at a very sedate 600RPM most of the time, and only starts turning faster at more than 80% load. The temperature does begin to rise at higher loads, and it would have been nice if Super Flower allowed the fan to spin a bit faster at maximum load -- obviously there's still plenty of room left in terms of noise output. As it stands, the Amazon 650W only puts out an exceptional 18dB(A) at up to 550W, making this the quietest actively cooled power supply we have seen to date. If you are like most users and you have a PC that never requires more than 500W, you will never hear this PSU.
The only real question we have is pricing. We will have to wait until Super Flower begins shipping these units to get a price quote.
ich frage mich warum ? 
