I am trying to overclock my IWILL KK266, and I cannot get my FSB speed past 129 Mhz. There is a jumper that has "FSB select jumper" and options are FSB 100 Mhz and FSB 133 Mhz. Whenever I try to change this jumper to 133, then the system will not boot. Also, if I go above 129 with the 100Mhz jumper setting, then it will not boot (or screen will not connect) and I must restart the FSB at 100. I have unlocked my multiplier... brought it down... upped the core voltage.... I am a semi-newbie at o/c ing and this is a big problem for me. I thought that my mobo wont support it, but then again, why the jumper setting? ANY help would be greatly appreciated. Thanks!