Laptops :: Laptop Graphics

i tryed 640x480  and 16 bit but still get same graphics dose dpi have anythign to do with it ? cause i didnt put anything there also when i got to video modes i get
0 0f00 80x25
1 0f01 80x50
2 0f02 80x43
3 0f03 80x28
4 0f05 80x30
5 0f06 80x34
6 0f07 80x60
what do i choose ?  and how do i do frame buffering sorry i'm more into hardware n mods then software