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Has anyone tried RBE on ati mobility 3470?

sonnet

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As per title I wanna ask if anyone tried to tweak voltages of an ati mobility 3470 with RBE.
I own a laptop Toshiba satellite pro P300-19Q which mount this vga.
I saved the original bios and the opened it with RBE. I uploaded 3 screenshot.
In the first one (default.jpg) there are the default values.
In the second one (proposed.jpg) there are th changes I want make,basically reduce the maximum voltage from 1.2v to 1.1 and reduce frequency of clockinfo 2 and 9 from 300mhz to 110mhz. I also reduced voltage in clockinfo 4 and 5 from 1.2v to 1.0 given that frequency is only 300mhz (while maximum is 680mhz in 3d).
What do you think about this voltages?
Should I leave at default values obscured by "lock" setting?(third screenshot)
 

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