D3030 (BX920 S2)
Technical Manual
27
Main memory
Spare Channel Mode
I
This mode is only supported by Intel
®
Xeon
®
5600 processor series.
In this mode, channel C forms a replacement for the two channels A and B and
channel F forms a replacement for the two channels D and E. Channels C and
F are not available as regular main memory. The channels are populated in the
same way as in Performance Channel Mode.
●
All three channels must be populated identically as regards the size and
organization of the memory modules.
●
Memory modules with different clock frequencies and different speed ratings
can be used within a channel, whereby the settings of the slowest memory
module are used for the channel.
●
The timings in the active channels (A and B) and in the spare channel (C)
can be set differently.
●
Only 2/3 of the maximum memory bandwidth is available in Spare Channel
Mode.
●
In Spare Channel Mode, the total main memory available in the system is
2/3 the size of the installed memory.
Figure 6: Fitting in Spare Channel Mode
CPU 1
CPU 2
DIMM 2A
DIMM 1A
DIMM 2B
DIMM 1F
1.
1.
2.
1.
2.
1.
2.
1.
1.
DIMM 1E
DIMM 1D
Front
Ch
a
nnel 2
Ch
a
nnel 1
Ch
a
nnel 0
DIMM 1B
DIMM 1C
DIMM 2C
Ch
a
nnel 0
Ch
a
nnel 1
Ch
a
nnel 2
S
lot 1
S
lot 0
S
lot 0
S
lot 0
S
lot 0
S
lot 1
S
lot 0
S
lot 0
S
lot 1
