Oracle X8-2L Service Manual page 131

You must not replace a dual-rank DIMM with a quad-rank DIMM and vice versa. If you violate
this rule, the performance of the server might be adversely affected. For DIMM slot population
rules, see "DIMM Population Rules" on page
3. Install a DIMM.
Ensure that the ejector tabs are in the open position.
a.
b. Align the notch in the replacement DIMM with the connector key in the
connector slot.
The notch ensures that the DIMM is oriented correctly.
c. Push the DIMM into the connector slot until the ejector tabs lock the DIMM in
place.
If the DIMM does not easily seat into the connector slot, verify that the notch in the DIMM
is aligned with the connector key in the connector slot. If the notch is not aligned, damage
to the DIMM might occur.
4. Repeat Step 3 until all replacement DIMMs are installed.
5. Return the server to operation:
122.
Servicing the DIMMs (CRU)
Install a DIMM
131