Thermaltake Purepower 560w PSU
 

Cooling is handled by two case fans.  The exhaust is your standard 80mm case fan.  The intake fan located on the bottom of the unit so it can help pull hot air up and off your processor is a 90mm number.  Both fans are auto adjusting so at 40 degrees Celsius and below, things spin at 1400 RPM making 20 dBA.  Fan speed and noise increases relative to the temperature detected by an internal probe to a max of 3500 RPM at 43 dBA should the top temperature level of 60 Celsius be reached.  Something else that is auto adjusting is detection of 115/230 voltage from the power cable coming in.

I have seen this done before but only in backyard mod form.  Thermaltake has scored big points for neatness in sleeving all the power lines and shrink wrapping the ends.  There are four strands of Molex power connectors (wrapped in blue) each with two four-pin Molex and one FDD connector.  There is one strand in green that has two SATA connectors.  These aren't SATA power adapters, the Purepower unit is the only true SATA power ready product I've seen.

Cracking open the case we find that modern heatsink technology has migrated into the PSU's heatsinks.  The standard aluminum convection fins are here but if you look closely in the bottom right pic you will see that the heatplate is made of copper. 

Thermaltake makes a big deal about stable power.  They can brag about this in part because of the active power factor correction.  This is done via extra capacitors that keep things in line should any effects of leakage or load present themselves.

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