Lenovo ThinkStation C20x 4269 Hardware Manual page 124

4. Position the replacement memory module over the memory slot. Make sure the
5. Go to "Completing the FRU replacement" on page 123.
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Hardware Maintenance Manual
notch 1 on the memory module aligns correctly with the connector key 2
on the system board. Push the memory module straight down into the
connector until the retaining clips close.