I get the 'Out of bounds' error on vcpufreq on my Athlon XP 2500+ (OC to 3200+) but it opens fine on my P3 750 box.
No such file or directory
Yes, this is also the case on vec's box. This is, of course, the culprit, as vcpufreq loads the frequencies combobox from this file. It is supposed to be there whenever a cpufreq kernel module is loaded, but I guess the AMD module doesn't follow the docs...
Anyway, the good news is that changing frequency does work in these cases, so as a workaround, the next vcpufreq release will supply the min and max available frequencies in the combobox whenever scaling_available_frequencies is missing. The bad news is, this will miss out on a lot of working (tested on vec's box) in-between settings, so if anybody figures out another way to get the list, please let us know.