Relion 1900e/2900e Manual
Revision 1.0
26
LRDIMM Rank Multiplication Mode and Direct Map Mode must not be mixed within or across
processor sockets. This is a Fatal Error Halt in Memory Initialization.
In order to install 3 QR LRDIMMs on the same channel, they must be operated with Rank
Multiplication as RM = 2. This will make each LRDIMM appear as a DR DIMM with ranks twice as large.
RAS Modes Lockstep, Rank Sparing, and Mirroring are mutually exclusive in this BIOS. Only one
operating mode may be selected, and it will be applied to the entire system.
If a RAS Mode has been configured, and the memory population will not support it during boot, the
system will fall back to Independent Channel Mode and log and display errors.
Rank Sparing Mode is only possible when all channels that are populated with memory meet the
requirement of having at least 2 SR or DR DIMM installed, or at least one QR DIMM installed, on each
populated channel.
Lockstep or Mirroring Modes require that for any channel pair that is populated with memory, the
memory population on both channels of the pair must be identically sized.
The following table identifies possible DIMM population configurations
Table 6. DIMM Population Matrix
# of
DIMMs
Processor Socket 1 = Populated
Processor Socket 2 = Populated
M
A
1
A
2
A
3
B
1
B
2
B
3
C
1
C
2
C
3
D
1
D
2
D
3
E
1
E
2
E
3
F
1
F
2
F
3
G
1
G
2
G
3
H
1
H
2
H
3
1
X
N
2
X X
N
2
X
X
Y
2
X
X
N
3
X X
X
N
3
X
X
X
N
3
X
X
X
N
3
X
X
X
N
4
X X
X
X
Y
4
X X
X
X
N
4
X
X
X
X
Y
4
X
X
X
X
Y
4
X X
X
X
N
4
X
X
X
X
Y
5
X X
X
X
X
N
5
X
X
X
X
X
N
6
X X
X
X
X
X
Y
6
X
X
X
X
X
X
Y
6
X X
X
X
X
X
N
6
X
X
X
X
X
X
N
8
X X
X
X
X
X
X
X
Y
8
X X
X
X
X
X
X
X
Y
8
X
X
X
X
X
X
X
X
Y
8
X X
X
X
X
X
X
X
N
12
X X
X
X
X
X
X
X
X
X
X
X
Y
12
X X
X
X
X
X
X
X
X
X
X
X
N
Summary of Contents for Relion 1900e
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