D2861 (BX922 S2)
Technical Manual
29
Performance features
Main memory
V
CAUTION!
If only one CPU is installed, the empty DIMM slots must be fitted with
dummy DIMM modules to ensure sufficient cooling of the system (this
does not apply if two CPUs are installed).
3.2.1
Memory speed
The maximum DDR3 memory speed depends on the memory configuration on
one memory channel and on the CPU speed.
One DIMM per channel = max. 1333 MHz, two DIMMs per channel = max.
1333 MHz for 1.5 V memory / max. 1066 MHz for 1.35 V memory. The memory
channel with the lowest speed defines the speed of all CPU channels in the
system.
DI
M
M
type
DI
M
M
sl
o
ts
p
e
r c
h
a
nne
l
DI
M
M
s
p
opul
a
te
d
p
e
r c
h
a
nne
l
M
a
x
. m
e
mo
ry
sp
e
e
d
(CP
U
-
d
e
pe
nde
n
t)
Ran
ks p
e
r
DI
M
M
*
2 / 2
1
800, 1066, 1333
SR / DR
RDIMM
2 / 2
1
800, 1066
QR
1.5 V
2 / 2
2
800, 1066, 1333
Mix of SR + DR
1333 MHz
2 / 2
2
800
Mix of QR + SR /DR
2 / 2
1
800, 1066, 1333
SR / DR
RDIMM
2 / 2
1
800, 1066
QR**
LV /1.35 V
2 / 2
2
800, 1066
Mix of SR + DR
1333 MHz
2 / 2
2
800
Mix of QR** + SR /DR
UDIMM 1.5 V
2 / 2
1
800, 1066, 1333
SR / DR
1333 MHz
2 / 2
2
800, 1066, 1333
Mix of SR + DR
UDIMM LV / 1.35 V
2 / 2
1
800, 1066, 1333
SR / DR
1333 MHz
2 / 2
2
800, 1066
Mix of SR + DR
* SR = single rank, DR = dual rank, QR = quad rank
** No memory modules released for this configuration
*** Lost LV-mode memory will automatically switch to 1,5 V Vcc
