Dell XPS 15Z (L511Z, Mid 2011) - Manual (Page 85)

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Specifications
Video
Integrated
Video
controller Intel HD Graphics
Video
memory up to 1.6 GB
Discrete
Video
controller NVIDIA GeForce GT 525M
Video
memory 1 GB or 2 GB DDR3
Display
Type 15.6‑inch HD WLED,
TrueLife
15.6‑inch Full HD WLED,
TrueLife
Display
Dimensions:
Height 193.59 mm (7.62 inches)
Width 344.16 mm (13.54 inches)
Diagonal 396.42 mm (15.60 inches)
Maximum
resolution HD: 1366 x 768
FHD: 1920 x 1080
Refresh rate 60 Hz
Operating
angle 0° (closed) to 135°
Horizontal
viewing angle 40/40
Vertical
viewing angle 15/30 (H/L)
Pixel pitch 0.2265 mm x 0.2265 mm