Supermicro Supero X8DAi User Manual page 28

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 DIMMs
Slots per Populated
Channel per Channel
2 1
2 1
2 2
2 2
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
Firmware Hub fl ash 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 for the OS & other
applications
DIMM Population Table
DIMM Type (Reg.= Speeds (in MHz)
Registered)
Reg. DDR3 ECC 800,1066,1333
Reg. DDR3 ECC 800,1066
Reg. DDR3 ECC 800,1066
Reg. DDR3 ECC 800
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
2-8
Ranks per DIMM
(any combination;
SR=Single Rank,
DR=Dual Rank,
QR=Quad Rank)
SR or DR
QR
Mixing SR, DR
Mixing SR, DR,QR