The next lowest speed I can set it to according to the mother board manual is 450mhz. You need to restart your computer. When I do this, windows will only run in safe mode. When the computer does start, I see the CPU clock speed to be 450. If you can help me, or need any other information, please contact me.
Many chips have the mutliplier locked.
You can't change this number. Whatever jumper you are playing with you need to know what it does. Now, in some cases, raising the core voltage slightly, and I mean slightly can help with the stability of the overclock. But this is very dangerous to do. Also, your RAM will determine how high you can go.