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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-
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
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 for the OS & other applications
Note :
The motherboard will NOT boot if DIMM module(s) are installed in any of the
Bank2 slot(s).
Size
Physical Memory
Remaining (-Available)
(4 GB Total System Memory)
1 MB
3.99 GB
4 KB
3.99 GB
2 MB
3.99 GB
4 KB
3.99 GB
256 MB
3.76 GB
256 MB
3.51 GB
512 MB
3.01 GB
16 MB
2.85 GB
1 MB
2.84 GB
2.84 GB
2-9
Chapter 2: Installation
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