Dell Alienware M17x R2 (Early 2010) - Manual (Page 94)

CHAPTER 21: GRAPHICS CARD BLANK
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If your computer has a dual graphics configuration, the secondary graphics card
is already installed on the right side of the computer base (to remove and replace
the graphics card see the instructions in “Graphics Card(s)” on page 85 and
“Graphics Card Fan(s)” on page 90).
If you do not have a secondary graphics card, your computer will have a graphics
card blank instead.
CHAPTER 19: GRAPHICS CARD BLANK
CHAPTER 21: GRAPHICS CARD BLANK