Talking of power savings, from a FreeBSD mailing list in November last year with an early beta version of the AMD 10h cpufreq patch which I have updated above for 10h and now 11h CPUs:
cpu: Phenom 9350e quadcore 4x 2.0GHz (energy efficient 65W version, not black edition)
mem: 1GB DDR2/666 CL5 (1 DIMM)
mobo: Asus M3N72-D Socket AM2+ with nVidia 750a SLI chipset.
hdd: 2,5" 40GB Hitachi notebook HDD on Parallel ATA (udma33)
power supply: Huntkey Greenstar 400W
measurement: average real power drain at wall socket, tested with
Voltcraft Energycheck 3000
@2000: 88.4W
@1200: 75.0W
@1000: 68.5W
@800: 65.0
@600: 60.7W
@400: 58.0W
So in total i shave off 30.4W when idling using cool'n'quiet!! This is very very cool. =)