Gateway 450 - Manual (Page 261)

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Chapter 15: Upgrading Your Notebook
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8
Pull the memory module out of the slot.
9
Hold the new or replacement module at a 30-degree angle and press it into
the empty memory slot. This module is keyed so that it can only be inserted
in one direction. If the module does not fit, make sure that the notch in
the module lines up with the tab in the memory bay.
Important Use only memory modules designed for the
Gateway 450SX4.