Satellite P750-05F reserved graphics memory and best nVidia driver

I have recently purchased a P750-05F.
The systems specs under windows 7 say
8 gig ram installed. 6 gig available for system ram.
For the graphics GT540M it says 2 gig dedicated, 4 gig available.
Obviously 2 gig of system ram is reserved for the graphics. How can i undo this?
I think 2 gig dedicated is more than enough.
I want to release the reserved 2 gig system ram back to system ram.
I cannot find any bios or graphics driver options to do this ??
Also what is the best latest nvidia driver to use for best performace on this laptop ?
Please help.

So if the GT540 is NOT using the reserved 2 gig, is is available for use by system ram if required.
Or is it locked off from system ram never ever to be used.
Seems like a waste if it is ?
So whats the story on that part ?
thanks

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@arbaz ,
Hello and thank you for posting on the HP support forums.
I am sorry but I am not understanding what you are asking. If you see two display adapters you are looking at the main graphics adapter and then the GPU. The GPU is part of the systems CPU. One is dedicated and the other is part of the CPU.
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Satellite P750-05F reserved graphics memory and best nVidia driver

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