Linux benchmark tools

[Vu Pham]

I build a new Suse workstation using Cpu Intel X6700 which is supposed
to run at 2.66Mhz. /proc/cpuinfo shows it runs only at 1.6Ghz.

A Google search told me that this cpu has SpeedStep technology that will
automatically switch the cpu to 1.6Ghz when it is in idle mode and will
turn it back to 2.66Ghz when load increases. That's good to save power,
but when working on this PC, I think it is slower noticeably than my
current workstation. 

Is there any way to disable Speedstep so that I can check how it works
in full speed ?

What benchmark tools available for Linux ?

Thanks,

Vu