thanks for the responses. here is where i am now: in the manual for the ka266, it shows 2 options for the cpu fsb speed setting. if you leave the jumper off(open) it says cpu 133/133mhz. if you leave the jumper on it says cpu 100/100mhz. i guess that whenever i see things like "ka266" this means 133 bus spee. is that right? why is the mobo called a 266, i think it can only run up to 133. im using 256mb of ddram, 1ghz athlon, iwill ka266. thanks for any additional input, i need the help and this on line community has helped me learn a ton!