Phoronix: Nouveau Now Supports Overclocking Your GPU

While the Nouveau driver may not yet have a stable Gallium3D or DDX driver release nor does it have capabilities like stabilized power management or OpenGL 3.x, if you want to overclock your NVIDIA graphics card with this open-source driver, you can now do so today. Martin Peres who has been working on Nouveau power management support and timing management, has produced a patch to support custom clock manipulation of the NVIDIA graphics card's core clock, memory clock, and shader clock speeds. The voltages can also be manipulated too whether you are manually overclocking or underclocking your GPU with this Linux kernel DRM driver...

http://www.phoronix.com/vr.php?view=ODgwNw