User`s manual
Chapter 2: Installation
2-9
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 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 rst DIMM module must be
installed in DIMM1A, and all Bank1 slots must be lled 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-
cic 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.