It can't be overclocked.
What is your motherboard model?
My motherboard's name is
Intel® AL440LX Motherboard
I used to have the same proccesor (look at pic below), and I couldnt overclock it
We upgraded to an Intel Pentium II 400 mhz proccesor, but because the (Grand)Motherboard was too old, it said that the proccesor was 266 mhz...
I went to the bios to see if I could overclock it, but it wouldn't allow me to alert the clock speed...
Picture: