Dell XPS 420 (Late 2007) - Manual (Page 106)

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)
book.book Page 106 Tuesday, November 27, 2007 10:29 AM