I7-2600K on DZ68DB CPU Clock jumps

Hello,

I have a problem with cpu clock: I7-2600K on DZ68DB, BIOS ver. 0043, Win 7 Pro, 64bit.

I turned off SpeedStep, C State and Turbo Boost in BIOS settings, but CPUID shows me: "CPU Clock - 1596.x , Multiplier - 16x jumping to CPU Clock - 3392.x, Multiplier - 34".

How can I get the constant CPU speed?

Thanks,

Evgeny