Differentiate of graphics and graphics 2D?

Raster graphics is the generic term for bitmap graphics. Raster comes from the fact that the value of a 2D (XY) raster are specified (the term can be applied for more dimensions as well). With other...

Overclock it.

For regular applications you won't notice a difference but in games, definitely.

If you mean you want to use a graphic card and not your onboard graphics , then yes. But you don't touch the chip, when you install a card into the slot, and remove your onboard graphic drivers, then...

yep