Arctic Cooling has lifted the lid on the Fusion 550R PSU, but in this case PSU stands for Payment Saving Unit.
So, what's special about the Fusion 550R PSU? Well, according to Arctic Cooling switching to this PSU can save you 100€ over four years compared to a standard PSU (assuming it's in service 200 days/year with 4 half days at full load and where juice costs 0.15€/kWh - you'll have to number crunch your own kWh figures to find out how much you can save). A quick number crunch based on average kWh prices across the US suggests that over 4 years you'd save roughly the price of the unit.
Here's the spec of the PSU:
- Ultra quiet 80mm PWM fan with low noise impeller
- 550W maximum output power, ATX 2.2
- 82-86% efficiency, 99% PFC
- 80mm ARCTIC F8 Pro fan
- Intelligent fan control (700 – 2,000 RPM)
- Controller for case ventilation
- Over-Power, Over-Voltage, Short Circuit protection
- SLI and Crossfire compatible
The externally mounted fan is certainly an interesting idea - as long as it doesn't get fouled by anything and fry the PSU.
Personally I think that this might be worth considering if building a new PC or replacing an old PSU, but I wouldn't bother replacing an existing PSU for those savings. Much better to switch on power management or turn your PC off when it's not in use.