In my opinion, you're missing that it's an automatic feature and only used,
when you've a power hungry application and enough resources available.

http://www.intel.nl/content/www/nl/nl/archite...rbo-boost-technology.html

for better answers post processor vintage....also cut # of threads, ie: 3>2>1

Thanks Bearcat.... So they only was to get the full power of the CPU is limit the number of cores? Is this issue with just this chip set or others, for example x1230v2?

Below the Intel turbo table, from which it is evident that the scaling up and down is -excluding- of hyperthreads.

http://www.intel.com/support/processors/corei7/sb/CS-032279.htm

Mine is a real 4 quad + hyperthreading. Running 8 boinc jobs concurrent sets turbo at 3.7ghz when the base is 3.4. When setting 6, the turbo stays at 3.7, this because the physical cores are still fully utilized. Only when going down to 3 boinc threads does the turbo go to 3.8, 3790.95, as per the documentation.

Measurement with CPU-Z. 1.70

If in Ubuntu, there's various little monitors such as CPU-Freq, where mine is locked to 'Performance', similar to what can be done in Windows.

Xeon processors are made to run long and hard whereas i7 processors are made to run in spurts on higher settings. Xeon will outlast an i7 if you run them max for a long period of time. One of the reasons you won't see OCing options on motherboards. to expensive to burn up. there are other ways like adjusting voltage and such to get xeons a bit higher but you really need to know what your doing before trying it. I have a hex i7 and like tweaking it from time to time through the bios but since I don't water cool, don't care to have a 500 dollar chip burn up. You can get an SR2 motherboard to crank yours up. If you do, better have water cooling or you will burn them up. Good luck.