I have a HP Elitebook 840 G1 in which intel core i5 4300U processor is being used and according to above mentioned intel site link the max turbo speed of this processor is 2.90 GHz but my machine shows 2.50 GHz why?
Moreover i noticed that machines doesn't show the actual turbo speed which are mentioned on intel site why?
Your quick response will be highly appreciated.
Your machine shows 2.5GHz where? Doesn't show the actual turbo speed where?
This is a very complicated feature and what is achievable at any point in time is dependent upon a lot of criteria including number of cores active, temperatures of these cores, etc. Shoving some sort of load on the system and expecting to see the max turbo speed just isn't going to happen. The max turbo speed only happens when there is only a single core active and temperatures show elbow room for this core to be overclocked.
For more information (get ready to do a lot of reading; this isn't a simple thing), consult these sources:
Hope this helps,
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I presume you have finished all of this reading and understand what you will and won't see?