Ian Pilcher wrote: > Seems like a simple question, but I can't find a definition anywhere. > > Anyone know? Yes perhaps. Vtt is a voltage needed by memory bus termination resistors. http://www.ocworkbench.com/2003/asrock/k7s8xguide/K7S8Xmods/k7s8x_voltage_mods.htm Read more: http://www.google.com/search?hl=cs&q=vtt+voltage+termination&btnG=Hledat&lr= Regards Rudolf