HP Integrity BL860c i2 User's & Service Manual page 51

NOTE: The server blade ships with at least two DIMMs installed in slots 3A and 4A.
3. Ensure the DIMM slot latches are open.
CAUTION: Use only HP low profile DIMMs. DIMMs from other sources might adversely
affect data integrity.
DIMMs do not seat fully if turned the wrong way.
DIMMs in a pair or quad must be identical.
Installing internal components 51