My PC has a Pentium III. Originally it has 256 RAM and it was set to run at 600MHz (factory). I have changed to 512RAM (Crucial RAM card) expecting that my PC will improve its performance but for my surprise it is running now at 300 MHz instead of 600MHz. I have tried to use the BIOS menu to change it from 300 to 600 but the BIOS is still set to 600MHz. It displays the speed as it was before I made the change.
Now my PC is running very slow. What is the problem? Do I need to remove the extra 256 RAM that I added?