Apple PowerBook 165 - Manual (Page 144)

Upgrades PSRAM Expansion Card - 6
Caution:
Handle the PSRAM
card by the edges only. Do
not touch any components on
the card.
Caution:
If you install a
third-party expansion
card, do not remove or cover
up any of the heat sinks on
the daughterboard.
Operating the computer
without the heat sinks
significantly increases the
chance of daughterboard
failure.