Your last query update only one record then i cannot imagine how do you measure this.

But i have answered your question based on information provided. CPU can be used in stricte calculations like  a*b or e.g sort operations. To see simple what do CPU in particullar database operation and if you can benefid from faster CPU, put your db on RAM disk and measure times in your specific DML like select, update on both machines. This is also limited because of dufference in motherboard, speed of RAM ...

Regards,