HP AFICIO SP 8100DN - Manual (Page 40)

Attaching Memory Unit Type D 128MB, Memory Unit Type E 256MB (SDRAM Module)
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2
F
Be sure to install the SDRAM module into the slot as shown.
Two slots are provided for the SDRAM modules.
The default SDRAM module is installed in the inner slot.
To install an additional memory, attach an additional SDRAM module to the
outer slot, or replace the default SDRAM module.
G
When installing an SDRAM module in a vacant slot, align the notch of the
SDRAM module with the slot, and then insert the module vertically.
H
Press down the SDRAM module, until it clicks into place.
AQV560S
AQV761S
AQV762S