28
Technical Manual
D2861 (BX922 S2)
Main memory
Performance features
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03
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Spare Channel Mode
I
This mode is only supported by Intel processors of type Intel
®
Xeon
®
processors of the 5600 series.
In this mode, channel C forms a replacement for the two channels A and B.
Channel C is 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.
●
The slots within a channel do not have to be populated identically, but the
corresponding slots of all three channels must be populated identically.
●
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 7: Fitting in Spare Channel Mode
CPU 2
CPU 1
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DIMM 1C
1.
DIMM 2C
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DIMM 1B
1.
DIMM 2B
2.
DIMM 1A
1.
DIMM 2A
2.
DIMM 2D
2.
DIMM 1D
1.
DIMM 2E
2.
DIMM 1E
1.
DIMM 2F
2.
DIMM 1F
1.
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Front
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ide
