A turbo-pll (controller) is some kind of device you hook up directly to your mobo (I don't know how, but though) to set your frequency regulation. People manipulate their mobo's in such a way they reach idiot high FSB speeds. I don't know if the device takes over all the pll-funcions or that it only controls them. These devices are VERY expensive and no option for any normal overclocker. I know some OC-sites which sell it, problem is they're dutch. Hope this helps!
Also go to www.k7v.com for some good advice, oc'ing your k7v!