Here is my ASUS Terminator running the userland cpufreq driver (max is 800Mhz):
cat /proc/cpuinfo processor : 0 vendor_id : CentaurHauls cpu family : 6 model : 7 model name : VIA Samuel 2 stepping : 3 cpu MHz : 533.442 cache size : 64 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu de tsc msr cx8 mtrr pge mmx 3dnow bogomips : 1068.19
At this speed with a 2.5" SATA hard drive, the system consumes approximately 26 watts, not counting the lcd monitor display. The amazing thing about this machine is that it can be purchased for as little as $75!