AMD Opteron/Athlon64 PowerNow!

modulename: powernow-k8.ko

configname: CONFIG_X86_POWERNOW_K8

Linux Kernel Configuration
└─>AMD Opteron/Athlon64 PowerNow!
In linux kernel since version 2.6.12  
This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
Support for K10 and newer processors is now in acpi-cpufreq.

To compile this driver as a module, choose M here: the
module will be called powernow-k8.

For details, take a look at Documentation/cpu-freq/.