Hello, any help on this issue would be great! My system is based on a ECS P4S5A/DX Motherboard (Socket 478) and a Pentium 4 / 1,8 GHZ processor. I found another better one to replace the processor, the Pentium 4 / 2,8 GHz. Everything works fine, but the new processor runns at 2,1 GHz and not at its full speed ( It says 21 * 100 ). From the BIOS setup i can not change neither the multiplier 21 (which i expected) nor the FSB value of 100. How can i make the processor to work at its normal speed?? Thanks a lot in advance!