HPE ProLiant DL325 Gen10 Plus v2 User Manual page 159

For more information, see the documentation that ships with the option.
11. To install the expansion card in the primary riser, do the following:
a. Remove the primary riser cage.
b. Remove the riser slot blank.
c. Install the expansion card.
Make sure that the card is seated firmly in the slot.
Primary riser slot 1
Primary riser slot 2
d. Install the primary riser cage.
12. To install the expansion card in the secondary riser, do the following:
If you are installing a full-height expansion card in the secondary riser, make sure that the riser is equipped with the full-height
retainer bracket.
a. Remove the riser slot blank.
b. Install the expansion card.
Make sure that the card is seated firmly in the slot.
Half-height, half-length expansion card
Installing an expansion card 159