X8STI datasheet(33/109 Pages) ETC1

33 / 109 page

Chapter 2: Installation

2-9

Possible System Memory Allocation & Availability

System Device

Size

Physical Memory

Remaining (-Available)

(4 GB Total System Memory)

Firmware Hub flash memory (System BIOS)

1 MB

3.99 GB

Local APIC

4 KB

3.99 GB

Area Reserved for the chipset

2 MB

3.99 GB

I/O APIC (4 Kbytes)

4 KB

3.99 GB

PCI Enumeration Area 1

256 MB

3.76 GB

PCI Express (256 MB)

256 MB

3.51 GB

PCI Enumeration Area 2 (if needed) -Aligned on

256-MB boundary-

512 MB

3.01 GB

VGA Memory

16 MB

2.85 GB

TSEG

1 MB

2.84 GB

Memory available for the OS & other applications

2.84 GB

Note :

The motherboard will NOT boot if DIMM module(s) are installed in any of the

Bank2 slots but none in the Bank1 slots. The first DIMM module must be

installed in DIMM1A, and all Bank1 slots must be filled before populating any

Bank2 slot(s).

Maximum Memory Possible

Single Rank UDIMMs - 12GB (6x 2GB DIMMs), Dual Rank UDIMMs - 24GB (6x

4GB DIMMs)

Note 1: Both Unbuffered ECC and Non-ECC DIMM modules are supported by the

motherboard. Using ECC or Non-ECC memory on your motherboard depends on

the CPU installed.

Note 2: Due to OS limitations, some operating systems may not show more than

4 GB of memory.

Note 3: 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. Refer to the table on the

next page. For Microsoft Windows users: Microsoft implemented a design change

in Windows XP with Service Pack 2 (SP2) and Windows Vista. This change is spe-

cific 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.

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