Apple Power Macintosh 5400 series - Manual (Page 144)

IMPORTANT The DIMMs should be 64-bit-wide, 168-pin fast-paged mode,
with 70-nanosecond (ns) RAM access time or faster. DIMMs that are either
32 or 64 MB must support a 2K refresh count. The Single Inline Memory
Modules (SIMMs) from older Macintosh computers are not compatible with
your computer and should not be used.
If you decide to have additional DRAM installed in your computer, the
DIMMs can be installed one at a time in any order in either of the memory
slots.
High Performance Module (cache) configurations
A 256K Level 2 memory cache provides an overall increase in your
computer’s performance. You can add a cache by having an Apple-authorized
dealer or service provider install the High Performance Module (256K Level
2 cache) in the cache slot on the main logic board of your computer.
Opening the computer
IMPORTANT To avoid generating static electricity that may damage
components, do not walk around the room until you have completed the
installation of the expansion card or memory and closed the computer.
Additionally, move the logic board as little as possible while it is outside the
computer case.
1 Turn off your computer following the instructions in “Turning the Computer Off” in
Chapter 1 of this manual.
2 Turn the computer completely off by pressing the power switch at the back of the
computer.
Press the side of the switch marked with the j symbol.
3 Unplug all the cables except the power cord from the computer (including the cable that
connects your keyboard to the computer).
Leaving the power cord plugged in helps protect the computer from damage
caused by electrostatic discharge.
132 Appendix B