HP dc73 Service Reference Guide - HP Compaq dc7800 Business PC - Page 179

Populating SODIMM Sockets, Installing SODIMMs

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Populating SODIMM Sockets Item Description Socket Color 1 SODIMM1 socket, Channel A Black 2 SODIMM3 socket, Channel B White NOTE: A SODIMM must occupy the black DIMM1 socket. Otherwise, the system will display a POST error message indicating that a memory module must be installed in the black socket. 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. Installing SODIMMs CAUTION: You must disconnect the power cord 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. For more information, refer to Electrostatic Discharge Information on page 53. 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 (Preparation for Disassembly on page 159). 2. Remove the computer access panel (Computer Access Panel on page 163). 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. Memory 167

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Populating SODIMM Sockets
Item
Description
Socket Color
1
SODIMM1 socket, Channel A
Black
2
SODIMM3 socket, Channel B
White
NOTE:
A SODIMM must occupy the black DIMM1 socket. Otherwise, the
system will display a POST error message indicating that a memory module
must be installed in the black socket.
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.
Installing SODIMMs
CAUTION:
You must disconnect the power cord 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. For more information, refer to
Electrostatic Discharge Information
on page
53
.
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 (
Preparation for Disassembly
on page
159
).
2.
Remove the computer access panel (
Computer Access Panel
on page
163
).
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.
Memory
167