Interleaved Memory - What Is It And How Much Of A Performance
Gain Can You Expect
With
the advent of the Centris 650 and Quadra 800 many Macintoshes
(but not all) have been capable of Memory Interleaving.
Memory Interleaving consists of placing pairs of equivalent
sized memory chips in the corresponding memory slots of
your machines memory banks. The memory controller then sees
the two slots as one single logical unit that it can address
at once instead of going back and forth. For example you
could place a 64MB chip in slot A of memory bank group 1
and a 64MB chip in slot A of memory bank group 2 and you
would be able to take advantage of memory interleaving.
Chips must be installed in pairs and be of the same size.
For a much more detailed explanation of Memory Interleaving
click
here. You can find out if your machine is capable of
memory interleaving by downloading
Guru, NewTech's computer RAM specs database software.
The performance gain you will see from memory
interleaving depends on the clock speed of the machine,
the access speed of your RAM and the application you are
using. We performed the tests below on a Daystar
Millennium computer fitted with a 604e/200Mhz processor
card and 64MB of RAM. One set of test were run with the
memory interleaved and the second without.
The results below represent the percentage
of extra time taken to perform a given task by the non-interleaved
system. Longer bars equals slower performance
A folder of 50MB and 1,000 files was copied for this test
For this test a Word document was scrolled from beginning
to end
In this test a common word in a large ClarisWorks document
was replaced
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With
the advent of the Centris 650 and Quadra 800 many Macintoshes
(but not all) have been capable of Memory Interleaving.
Memory Interleaving consists of placing pairs of equivalent
sized memory chips in the corresponding memory slots of
your machines memory banks. The memory controller then sees
the two slots as one single logical unit that it can address
at once instead of going back and forth. For example you
could place a 64MB chip in slot A of memory bank group 1
and a 64MB chip in slot A of memory bank group 2 and you
would be able to take advantage of memory interleaving.
Chips must be installed in pairs and be of the same size.
For a much more detailed explanation of Memory Interleaving
