Hi Shoota my suggestion would be to use the Lion L1/L2 version from iAtkos released on the interwebs as you got a gigabyte board there are big chances that it will be fully supported and DSDT able you can find
HERE (you will need to have an account from tony in order to download it just make sure you know which revision you got and the right bios which only F4/F5 are support it good luck :)) as far as the GTX 210 card is wonderfully support it as a matter of fact I used to use them all the time...
Good luck make sure you use Graphic Enabler = Yes to get the most of your card and good luck!!!
KEXT, instruction and tutorial can be found
HERE too!!
Let me know how it goes!!