I have GEFORCE 8500 GT graphic card. How can i get best and safe performance with that?

I have GEFORCE 8500 GT manufactured by gigabye. Config is 512mb ddr2 memory, 128-bit interface. coreclock- 550MHZ, and memory clock-800MHZ. But i didnt understand how to get best and safe performance with that. I am confusing with the settings like ANTI ALIASING, VERTICAL SYNC, TEXTURE AND ANISOTROPIC FILTERING, TRIPLE BUFFERING, EXTENSION LIMIT, GAMMA CORRECTION, MIPMAPS. I need detailed info about these setting. and how to get best and safe performance with my graphic card.

1- anti aliasing : its a kind of texture filtering so the textures that are far from you in the game would look like the ones near to you ( try comparing textures that are close to you and the ones that are far without antialiasing and with it , you would see what i mean )
2- vertical sync spares ur screen from dealing with high framerates that it cant handle , try wikipedia for detailed stuff.
3- anisotropic filtering : kind of has the same job as anti aliasing .
4- no idea
5- no idea
.... try wikipedia , it will really help you

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