The underestimated frequency of the processor

asgg
Percents Intel Core 2 Duo E8400? If in Windows option elektropitanie is on maximum performance (on sbalansirovannoi maybe a percent better, but I think in this percent, there is no such).
Go into the BIOS and see whether frequency is displayed and your multiplier and tire.
For accuracy Run AIDA 64 or CPU-z. The Windows may not correctly display frequency. (I wrote a 3.5 instead of 4.5 GHz in the system properties)
If you have a good mother and a cooler, we can do well to podrazhat.