Dell XPS 8500 (Early 2012) - Manual (Page 105)

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5
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2
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5 When the processor is fully seated in the socket, close the processor cover.
6 Pivot the release lever down and place it under the tab on the processor
cover.
CAUTION: Ensure that the processor cover notch is positioned underneath the
alignment post.
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5 alignment post
release lever
processor cover notch 2
4 processor cover
processor
Processor 105