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X8DA3/X8DAi User's Manual
Memory Support
The X8DA3/X8DAi supports up to 96 GB Registered ECC DDR3 1333 MHz/1066
MHz/800 MHz in 12 DIMMs. Memory speed support is dependent on the type of
CPU used on the board.
DIMM Module Population Confi guration
For memory to work properly, follow the tables below for memory installation:
DIMM Population Table
DIMM
Slots per
Channel
DIMMs
Populated
per Channel
DIMM Type (Reg.=
Registered)
Speeds (in MHz)
Ranks per DIMM
(any combination;
SR=Single Rank,
DR=Dual Rank,
QR=Quad Rank)
2
1
Reg. DDR3 ECC
800,1066,1333
SR or DR
2
1
Reg. DDR3 ECC
800,1066
QR
2
2
Reg. DDR3 ECC
800,1066
Mixing SR, DR
2
2
Reg. DDR3 ECC
800
Mixing SR, DR,QR
Note 1
: Due to OS limitations, some operating systems may not show
more than 4 GB of memory.
Note 2
: 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 dispropor-
tional. (See the following Memory Availability Table.)
Possible System Memory Allocation & Availability
System Device
Size
Physical Memory
Remaining (-Available) (4 GB Total System
Memory)
Firmware Hub fl 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
