User Guide

36
A
A
X
X
4
4
5
5
F
F
-
-
4
4
D
D
S
S
e
e
r
r
i
i
e
e
s
s
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
M
M
a
a
x
x
i
i
m
m
u
u
m
m
t
t
h
h
e
e
p
p
e
e
r
r
f
f
o
o
r
r
m
m
a
a
n
n
c
c
e
e
o
o
f
f
D
D
u
u
a
a
l
l
C
C
h
h
a
a
n
n
n
n
e
e
l
l
To get the highest performance of Dual Channel, the DIMM must meet the following conditions.
Matched DIMM configuration in each channel
● Same Density (128MB, 256MB, 512MB, etc.) ● Same DRAM technology (128Mb, 256Mb, or 512Mb)
● Same DRAM bus width (x8 or x16) ● Either single-sided or dual-sided
Matched in both Channel A and Channel B memory channels
● Populate symmetrical memory slots (Slot 0 or Slot 1)
Note: Memory interface speed will be set to the lowest speed of memory populated.
Table below shows DIMMs with same Organization and Density, but are non-matching as bus width, technology and/or external banks
are different. Mixing these DIMMs will put platform into single channel mode.
Organization Density
Composition Technology
External
16Mx64 128MB 16Mx8 *8 pcs 128MB 1
16Mx64 128MB 16Mx16 *4 pcs 256MB 1
32Mx64 256MB 16Mx8 *16 pcs 128MB 2
32Mx64 256MB 32Mx8 *8 pcs 256MB 1
Different Bus Width Different TechnologySame Density Same Organization Same # of DRAM Banks
Non-Matched
128MB DIMMs
Non-Matched
256MB DIMMs
Same Organization Same Density Same Bus Width Different Technology Different # of DRAM Banks