how to install graphics driver on a laptop with NVIDIA OPTIMUS(GT310M)

[hifihuang]

i have a laptop with core i3 and nvidia gt310m.the laptop has 2 Graphics card.it seems NVIDIA OPTIMUS technology.the built-in card can't to be disable in the bios.
i want to make GT310M to work.so i installed NVEnabler 64.kext on the laptop.but it can't work.  it will be Kernel Panic if i install Natit.kext or NVInject.kext.
in the end i got the graphics card rom of gt310m.i use NVCAP-Maker to get the card's NVCAP.but EFI-String didn't work out too.
So what can i do？
thx