Chapter 2: Installation
2-11
Notes
Be sure to use memory modules of the same type, same speed,
same frequency on the same motherboard. Mixing of memory
modules of different types and speeds is not allowed.
Due to memory allocation to system devices, the amount of
memory that remains available for operational use will be re-
duced when 4 GB of RAM is used. The reduction in memory
availability is disproportional. See the following table for details.
For Microsoft Windows users: Microsoft implemented a design
change in the Windows XP with Service Pack 2 (SP2) and Win-
dows Vista. This change is specic to the behavior of Physical
Address Extension (PAE) mode which improves driver compat-
ibility. For more information, please read the following article at
Microsoft’s Knowledge Base website at: http://support.microsoft.
com/kb/888137.
Possible System Memory Allocation & Availability
System Device Size Physical Memory
Remaining (-Available)
(4 GB Total System
Memory)
Firmware Hub ash memory (System BIOS) 1 MB 3.99
Local APIC 4 KB 3.99
Area Reserved for the chipset 2 MB 3.99
I/O APIC (4 Kbytes) 4 KB 3.99
PCI Enumeration Area 1 256 MB 3.76
PCI Express (256 MB) 256 MB 3.51
PCI Enumeration Area 2 (if needed) -Aligned on 256-MB
boundary-
512 MB 3.01
VGA Memory 16 MB 2.85
TSEG 1 MB 2.84
Memory available to OS and other applications 2.84
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