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

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)

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.

1Follow the procedures in "Before You Begin" on page 99.

2Remove the computer cover (see "Removing the Computer Cover" on page 101).

3Lay the computer on its side so that the system board is on the bottom of the inside of the computer.

4Press out the securing clip at each end of the memory module connector.

106

Removing and Installing Parts

Page 106
Image 106
Dell XPS 420 owner manual Installing Memory, Addressing Memory With 8-GB Configurations