Dell Dimension E521 Owner's Manual - Page 67

Addressing Memory With 4-GB Configurations - maximum memory

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2 1 1 Channel A: matched pair of memory modules in connectors DIMM_1 and DIMM_2 (white securing clips) 2 Channel B: matched pair of memory modules in connectors DIMM_3 and DIMM_4 (black securing clips) NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module. Otherwise, your computer may not start properly. You should install your original memory modules in pairs either in DIMM connectors 1 and 2 or DIMM connectors 3 and 4. NOTE: Memory purchased from Dell is covered under your computer warranty. Addressing Memory With 4-GB Configurations Your computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current 32-bit operating systems, such as Microsoft® Windows® XP, can use a maximum of 4 GB of address space; however, the amount of memory available to the operating system is less than that installed. Certain components within the computer require address space in the 4-GB range. Any address space reserved for these components cannot be used by computer memory. Removing and Installing Parts 67

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Removing and Installing Parts
67
NOTICE:
If you remove your original memory modules from the computer during a memory upgrade, keep them
separate from any new modules that you may have, even if you purchased the new modules from Dell. If possible,
do not pair an original memory module with a new memory module. Otherwise, your computer may not start
properly. You should install your original memory modules in pairs either in DIMM connectors 1 and 2 or DIMM
connectors 3 and 4.
NOTE:
Memory purchased from Dell is covered under your computer warranty.
Addressing Memory With 4-GB Configurations
Your computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current
32-bit operating systems, such as Microsoft
®
Windows
®
XP, can use a maximum of 4 GB of address
space; however, the amount of memory available to the operating system is less than that installed.
Certain components within the computer require address space in the 4-GB range. Any address space
reserved for these components cannot be used by computer memory.
1
Channel A: matched pair of memory
modules in connectors DIMM_1 and
DIMM_2 (white securing clips)
2
Channel B: matched pair of memory
modules in connectors DIMM_3 and
DIMM_4 (black securing clips)
2
1