Dell Dimension 9150 Owner's Manual page 73

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)
NOTE:
Memory purchased from Dell is covered under your computer warranty.
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
connectors DIMM_1 and DIMM_2 or connectors DIMM_3 and DIMM_4.
Addressing Memory With 4-GB Configurations
Your computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current
operating systems, such as Microsoft
space; however, the amount of memory available to the operating system is less than 4 GB. 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.
® ®
Windows XP, can only use a maximum of 4 GB of address
Removing and Installing Parts
73