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DRAM configurations
You can increase your computer’s DRAM to up to 512 MB. The main logic
board has eight DIMM slots which accept DIMMs that meet these
specifications:
m 8, 16, 32, or 64 MB (128 MB DIMMs are available, but they have not been
tested for use with Power Macintosh computers.)
m 64-bit wide, 168-pin
m 70-nanosecond (ns) RAM access time or faster (If you install DIMMs
with different speeds, they will all operate at the speed of the slowest
DIMM installed.)
m 1K, 2K, or 4K refresh rate
m extended data output (EDO) or fast-paged mode
IMPORTANT
The Single Inline Memory Modules (SIMMs) from older
Macintosh computers are not compatible with your computer and should
not be used.
DIMMs can be installed one at a time in any order in any of the memory
slots. However, if you wish to take advantage of your computer’s memory
interleaving capability, which provides maximum performance, you must
install the DIMMs in pairs, and in paired slots. (Slots are paired A1 and B1,
A2 and B2, and so on. It doesn’t matter which pairs you use or the order in
which you use them, as long as the DIMMs are installed in paired slots.)
Memory interleaving allows the computer to read or write to its memory at
the same time that other memory reads or writes are occurring, thus
providing approximately 5 percent to 15 percent faster performance.
To increase DRAM to the maximum of 512 MB, fill all eight slots with
64 MB DIMMs.
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Chapter 8