Bios Mods -The Best BIOS Update and Modification Source

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.

Guys, sorry for resurrecting this topic, but I have a problem with n73sv. The notebook is from a friend. I updated the BIOS to version 306 and after that Windows did not start any more. Then the problems began. I could no longer start with UEFI mode. I installed Windows 10 again, and Windows Update no longer installed the Video drivers, Intel 3000, or Nvidia. All the drivers I try to install conflict. I tried to install the original Windows 7 and download the drivers direct from the Asus website. Not so installed. Is there anything I can do? Is there a "307" version of this BIOS? If you can help me, I'll be immensely grateful.