Dell Alienware M17x R2 (Early 2010) - Manual (Page 85)

CHAPTER 19: GRAPHICS CARD(S)
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Your computer may have a single graphics or dual graphics configuration. The
graphics card on the left is the primary graphics card and the graphics card on the
right is the secondary graphics card.
In a single graphics configuration, your computer will only have a primary graphics
card.
In a dual graphics configuration, your computer will have a primary graphics
card, a secondary graphics card, and a graphics cable connecting the primary and
secondary graphics cards.
CHAPTER 17: GRAPHICS CARD(S)
CHAPTER 19: GRAPHICS CARD(S)