Rabit 1.5 is out!! You edit your x800 clock speeds in the bios so you don't have to load any 3rd party utilities to set your desired clock rate (great for VIVO users who use the XT bios but can't reach XT PE speeds)
http://www.mvktech.net/content/view/68/38/
http://www.mvktech.net/content/view/68/38/