ASUS N53SV, N73SV Core i7 turbo boost setting

[Juffus2012]

Hi everyone.

Is there any way to switch off Turbo Boost feature on ASUS N53SV or N73SV?
Because I need stable core frequency at 2.0GHz, not 2.9Ghz of one core.

Please have a look at BIOS, is there any hidden settings?

And the second question, there is an ASUS K52JU with Intel Core i5 450M, which has Intel HD video, but there works only AMD Radeon 6370M
I think the reason is also in hidden BIOS settings, please have a look too.
(and also for turbo boost please)

Thanks in advance, the result will be very important.