Dell PowerEdge M620 Owner's Manual page 182

Figure 3-15. Memory Locations
B1
B8
A8
A1
General Memory Module Installation Guidelines – PowerEdge M905
To ensure optimal performance of your system, observe the following
guidelines when configuring your system memory:
• Memory modules must be installed in pairs, beginning with the first two
sockets in each set of memory modules. These sockets are marked by white
retention levers.
• All memory modules in the blade must be identical in speed and
technology. The memory modules in each pair must be the same size.
182
Installing Blade Components
–
PowerEdge M905
D1
D2
D3
D4
C1
C2
C3
C4