Memory Installation Guidelines - Dell Precision Workstation 450 User Manual

Memory Installation Guidelines

• Memory module connectors must be upgraded in matched pairs. Memory module
connectors 1 and 2 must contain modules of identical size, type, speed, and number of
chips and memory module connectors 3 and 4 must contain modules of identical size,
type, speed, and number of chips. To locate the memory sockets on the system board,
see the system board components illustration (for the Dell Precision 450 computer, see
"System Board Components" or for the Dell Precision 650 computer, see "System
Board Components") or the system board label inside your computer.
• Before you install new memory modules, download the most recent BIOS for your
computer from the Dell Support website at support.dell.com.
M e m o r y M o d u l e L a b e l
Addressing Memory With 4-GB Configurations
Your computer supports a maximum of 4GB of memory when using four 1-GB DIMMs.
Current operating systems, such as Microsoft
utilize a maximum of 4 GB of address space; however, the amount of memory available to
the operating system is slightly 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. The following is a list of components that require
memory address space:
• System ROM
• APIC(s)
• Integrated PCI devices, such as network connector, SCSI controller, and IEEE 1394
controller
110 Memor y
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Windows 2000 and Windows XP , can only