Dell Alienware M17x R2 (Early 2010) - Manual (Page 90)

CHAPTER 20: GRAPHICS CARD FAN(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. The primary graphics card will have a
primary graphics card fan and the secondary graphics card will have a secondary
graphics card fan.
CHAPTER 18: GRAPHICS CARD FAN(S)
CHAPTER 20: GRAPHICS CARD FAN(S)