106 Removing and Installing Parts
Addressing Memory With 8-GB Configurations
Your computer supports a maximum of 8 GB of memory when you use four 
2-GB DIMMs. However, the amount of memory available to the operating 
system is less than 8 GB. This is because certain components within the 
computer require address space in the 8-GB range; and any address space 
reserved for these components cannot be used by computer memory.
  NOTE: 8 GB memory is available only if you ordered an operating system that 
supports 64 bits. If you ordered a system that supports only 32 bits then the memory 
available is 4 GB. 
Installing Memory
  CAUTION: Before you perform any of the procedures in this section, follow the 
safety instructions in the Product Information Guide.
 
NOTICE: To prevent static damage to components inside your computer, discharge 
static electricity from your body before you touch any of your computer’s electronic 
components. You can do so by touching an unpainted metal surface on the computer.
1
Follow the procedures in "Before You Begin" on page 99.
2
Remove the computer cover (see "Removing the Computer Cover" on 
page 101).
3
Lay the computer on its side so that the system board is on the bottom of 
the inside of the computer.
4
Press out the securing clip at each end of the memory module connector.
Channel A: matched pair of memory 
modules in connectors DIMM_1 
and DIMM_2 (white securing clips)
Channel B: matched pair of memory 
modules in connectors DIMM_3 
and DIMM_4 (black securing clips)
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