That's not so difficult (Score 1)

It's easy to use your P4 cpu more than 100% in this meaning. Just participate in the mersenne prime search. The P4 client is highly optimized assembly. When you look inside the source, you find comments like

The FDIV takes 39 clocks and only the last two can overlap with other float instructions. This gives us 37 clocks to do something useful with the integer units.

However, how did you measure your 112% value?

Maik