Video card Shared memory went from 15go to 3go (Os changed win8 to 7)

[Exodios]

hi guys (first of all sorry for my bad english)
i have asus g75vx with NVIDIA GeForce GTX 670MX
when i was on windows 8 i had 15 go shared memory for my video card as shown in this screenshot :

but when i change to win7 pro x64 it went down to nearly 3go :

what i can do to go back yo my previous stat ?
ps :
1- driver is updated
2- i'm not sure but i believe after i installed my windows7 and video card driver it was like in win 8 the shared memory : 15go and went down to 3go those last days

Thanks a lot guys for any support <3

 

[stormy13]

There is nothing you can change as that value is based on an algorithm depending on how much RAM you have installed. It is also never used unless your video card runs out of its own memroy, which ideally you don't want to happen as system RAM is slower than video RAM.

This,

http://www.sevenforums.com/tutorials/89278-video-memory-virtualization-brief-guide.html

should help to explain it.

 

[Exodios]

tnx mate you helped a lot ^_^