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Populating SODIMM sockets
There are two SODIMM sockets on the system board, with one socket per channel. The sockets are labeled
XMM1 and XMM2. The XMM1 socket operates in memory channel A. The XMM2 socket operates in memory
channel B.
Item
Description
1
SODIMM1 socket, Channel A
2
SODIMM2 socket, Channel B
The system will automatically operate in single channel mode, dual channel mode, or flex mode, depending
on how the SODIMMs are installed.
●
The system will operate in single channel mode if the SODIMM sockets are populated in one channel
only.
●
The system will operate in a higher-performing dual channel mode if the memory capacity of the
SODIMM in Channel A is equal to the memory capacity of the SODIMM in Channel B.
●
The system will operate in flex mode if the memory capacity of the SODIMM in Channel A is not equal to
the memory capacity of the SODIMM in Channel B. In flex mode, the channel populated with the least
amount of memory describes the total amount of memory assigned to dual channel and the remainder
is assigned to single channel. If one channel will have more memory than the other, the larger amount
should be assigned to channel A.
●
In any mode, the maximum operational speed is determined by the slowest SODIMM in the system.
Replacing SODIMMs
CAUTION:
before adding or removing memory modules. Regardless of the power-on state, voltage is always supplied to
the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing
memory modules while voltage is present may cause irreparable damage to the memory modules or system
board.
The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is important
to use memory modules with gold-plated metal contacts to prevent corrosion and/or oxidation resulting from
having incompatible metals in contact with each other.
Static electricity can damage the electronic components of the computer or optional cards. Before beginning
these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal
object.
When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the
module.
1.
Prepare the computer for disassembly
2.
Remove the access panel
18
Chapter 4 Removal and replacement procedures – small form factor (SFF) chassis
You must disconnect the power cord and wait approximately 30 seconds for the power to drain
(Access panel on page
System Board Label
XMM1
XMM3
(Preparation for disassembly on page
15).
Socket Color
Black
White
14).
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