Dell PowerEdge M620 Owner's Manual page 202

Independent Channel Mode (Optimizer Mode) – PowerEdge M610/M610x
In this mode, all three channels are populated with identical memory
modules. This mode permits a larger total memory capacity, but does not
support the reliability features of the other modes. To enable this mode,
select the Optimizer option on the Memory Settings screen of the System
Setup program. See "Memory Settings Screen" on page 140. A minimal
single-channel configuration of one 1 GB memory module per processor is
also supported in this mode.
Table 3-10. Examples of PowerEdge M610/M610x Memory Configurations
Total Memory Modules
Physical – Number and
Memory Type
1 GB One 1 GB
UDIMM
2 GB Two 1 GB
UDIMMs
2 GB Two 1 GB
UDIMMs
4 GB Two 2 GB
UDIMMs
4 GB Two 2 GB
UDIMMs
4 GB Four 1 GB
UDIMMs
4 GB Four 1 GB
UDIMMs
6 GB Six 1 GB
UDIMMs
6 GB Three 2 GB
UDIMMs
8 GB Four 2 GB
UDIMMs
202
Installing Blade Components
Memory Module Processors Memory
Locations
A1 One
A2, A3 One
A1, B1 Two
A2, A3 One
A2, A3 One
A2, A3, B2, B3 Two
A2, A3, B2, B3 Two
A1, A2, A3, B1, Two
B2, B3
A1, A2, A3 One
A2, A3, B2, B3 Two
Available
Mode Memory
Independent 1 GB
channel
Advanced 1 GB
ECC or
mirroring
Independent 2 GB
channel
Mirroring 2 GB
Advanced 4 GB
ECC
Mirroring 2 GB
Advanced 4 GB
ECC
Independent 6 GB
channel
Independent 6 GB
channel
Mirroring 4 GB