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The computer comes with double data rate 3 synchronous dynamic random access memory (DDR3-
SDRAM) dual inline memory modules (DIMMs).
The memory sockets on the system board can be populated with up to four industry-standard DIMMs.
These memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum
memory support, you can populate the system board with up to 8 GB of memory configured in a high-
performing dual channel mode.
For proper system operation, the DDR3-SDRAM DIMMs must be:
●unbuffered PC3-10600, 1333 MHz-compliant
●1.5 volt DDR3-SDRAM DIMMs
The DDR3-SDRAM DIMMs must also:
●support CAS latency 9 DDR3 1333 Mhz (9-9-9 timing)
●contain the mandatory JEDEC SPD information
In addition, the computer supports:
●512Mbit, 1Gbit, and 2Gbit non-ECC memory technologies
●single-sided and double-sided DIMMs
●DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not
NOTE:The system will not operate properly if you install unsupported DIMMs.
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Populating DIMM Sockets
There are four DIMM sockets on the system board, with two sockets per channel. The sockets are
labeled DIMM1, DIMM2, DIMM3, and DIMM4. Sockets DIMM2 and DIMM4 operate in memory channel
A. Sockets DIMM1 and DIMM3 operate in memory channel B.
Figure 7-5 DIMM Socket Locations
Table 7-1 DIMM Socket Locations
1DIMM1 socket, Channel ABlack
2DIMM2 socket, Channel A (populate
3DIMM3 socket, Channel BBlack
4DIMM4 socket, Channel B (populate
NOTE:A DIMM must occupy the XMM2 socket.
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
●The system will operate in single channel mode if the DIMM sockets are populated in one channel
●The system will operate in a higher-performing dual channel mode if the total memory capacity of
the DIMMs in Channel A is equal to the total memory capacity of the DIMMs in Channel B. The
technology and device width can vary between the channels. For example, if Channel A is
populated with two 1-GB DIMMs and Channel B is populated with one 2-GB DIMM, the system will
operate in dual channel mode.
●The system will operate in flex mode if the total memory capacity of the DIMMs in Channel A is not
equal to the total memory capacity of the DIMMs 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. For optimal speed, the channels should be
34 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis
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balanced so that the largest amount of memory is spread between the two channels. If one channel
will have more memory than the other, the larger amount should be assigned to Channel A. For
example, if you are populating the sockets with one 2-GB DIMM, and three 1-GB DIMMs, Channel
A should be populated with the 2-GB DIMM and one 1-GB DIMM, and Channel B should be
populated with the two 1-GB DIMMs. With this configuration, 4-GB will run as dual channel and 1
GB will run as single channel.
●In any mode, the maximum operational speed is determined by the slowest DIMM in the system.
Installing Memory Modules
CAUTION:You must disconnect the power cord and wait approximately 30 seconds for the power to
drain 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
1.Prepare the computer for disassembly (Preparation for Disassembly on page 29).
2.Remove the access panel (
Access Panel on page 30).
3.Locate the memory module sockets on the system board.
WARNING!To reduce risk of personal injury from hot surfaces, allow the internal system
components to cool before touching.
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4.Open both latches of the memory module socket (1), and insert the memory module into the
Figure 7-6 Installing a DIMM
NOTE:A memory module can be installed in only one way. Match the notch on the module with
the tab on the memory socket.
A DIMM must occupy the DIMM2 socket. Always populate the blue sockets before the black sockets
in each channel.
To create a dual-channel memory configuration, the memory capacity of Channel A must equal
the memory capacity of Channel B. Refer to
Populating DIMM Socketson page 34 for more
5.Push the DIMM module down firmly into the socket, ensuring that the module is fully inserted and
properly seated. The DIMM must be pushed all the way down into the socket and sit evenly in the
socket to avoid memory corruption. Make sure the latches are in the closed position (3).
6.Repeat steps 4 and 5 to install any additional modules.
7.Replace the computer access panel.
8.Reconnect the power cord and any external devices, then turn on the computer. The computer
should automatically recognize the additional memory when you turn on the computer.
9.Lock any security devices that were disengaged when the access panel was removed.
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The computer has three PCI Express x1 expansion slots and one PCI Express x16 expansion slot. The
expansion slots accommodate full-height or half-height expansion cards.
Figure 7-7 Expansion Slot Locations
Table 7-2 Expansion Slot Locations
1PCI Express x1 expansion slot
2PCI Express x1 expansion slot
3PCI Express x1 expansion slot
4 PCI Express x16 expansion slot
NOTE:You can install a PCI Express x1, x4, x8, or x16 expansion card in the PCI Express x16
To remove, replace, or add an expansion card:
1.Prepare the computer for disassembly (
Preparation for Disassembly on page 29).
2.Remove the access panel (
Access Panel on page 30).
3.Locate the correct vacant expansion socket on the system board and the corresponding expansion
slot on the back of the computer chassis.
Expansion Cards 37