I'm newbi to this forum, so I introduce myself: Hi to everyone

I know that this question seems foolish but I want to change the CPU string posted by the bios. The reason is because a friend of mine has a computer shop and he has different lines of computers, one of them are overlocked ones (tested very hard to be stable) and he wants the bios to post something like "Intel Q9550: 2,83@3,2Ghz" instead of "Intel Q9550: 2,83Ghz" (the AMI bios doesn't show up the actual speed).
As I said before, he usually works with AMI bios and Asus motherboards (P5Q, P6T...). I don't know if changing de cpu code will result in missfunctioning of the cpus... or if it's possible to change only the string.
Thanks in advance.