SUPER MICRO Computer X8SIA-F user manual Possible System Memory Allocation & Availability

X8SIA/X8SIA-F User's Manual

Note: Due to memory allocation to system devices, the amount of memory that remains available for operational use will be reduced when 4 GB of RAM is used. The reduction in memory availability is disproportional.

For Microsoft Windows users: Microsoft implemented a design change in Win- dows XP with Service Pack 2 (SP2) and Windows Vista. This change is specific to the Physical Address Extension (PAE) mode behavior which improves driver compatibility. 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

PhysicalMemory

Remaining (-Available)

(4 GB Total System Memory)

Firmware Hub flash memory (System BIOS)

Local APIC

Area Reserved for the chipset

I/O APIC (4 Kbytes)

PCI Enumeration Area 1

PCI Express (256 MB)

PCI Enumeration Area 2 (if needed) -Aligned on 256-MB boundary-

VGA Memory

TSEG

Memory available to OS and other ap- plications

1 MB

4KB

2MB

4KB

256MB

256MB

512MB

16MB

1MB

3.99

3.99

3.99

3.99

3.76

3.51

3.01

2.85

2.84

2.84

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