In windows I have a tool which I just turn on and have turbo boost constantly on my i5 in laptop.. Unfortunately i can't overclock my cpu over bios. Can anybody recommend any tool for Ubuntu ? I'm not worry about ventilation and electricity.
Turbo-boost is on "all the time" by default in the default
ondemand CPU governor.
But that doesn't mean the clock speed is always the turbo boost's level all the time and certainly not for all cores. Turbo boost allows the CPU to scale up one or two cores (depending on the CPU) to an overclocked level on demand. This will happen in Ubuntu.
What you can't (and shouldn't) do is try to turbo boost while overclocking. I'm not even sure it's possible. You'd be mixing two things that shouldn't be mixed.
But what you can do is set a manual overclock in your BIOS. CPU scaling will probably still happen but that isn't an issue because ondemand is just as fast as the performance governor in most situations. You can set it if you wish.