2-10
X8DT6/X8DT6-F/X8DTE/X8DTE-F User's Manual
1.35V DIMMs
•
1.35V RDIMM Population for the Motherboard w/5600 Processors Installed
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 (Note 1)
QR
2
2
Reg. DDR3 ECC
800,1066 (Note 2)
Mixing SR, DR
2
2
Reg. DDR3 ECC
800 (Note 3)
Mixing SR, DR, QR
Note 1:
1333/1066 MHz QR RDIMMs will run at 800 MHz (-BIOS automatic downgrading).
Note 2:
1333 MHz SR/DR RDIMMs will run at 800 MHz (-BIOS automatic downgrading).
Note 3:
1333/1066 MHz SR/DR/QR RDIMMs will run at 800 MHz (-BIOS automatic downgrading).
Note 4:
Mixing of 1.35V and 1.5V DIMMs is not recommended.
1.35V UDIMM Population for the Motherboard w/5600 Processors Installed
DIMM
Slots per
Channel
DIMMs
Populated
per Channel
DIMM Type (Unb.=
Unbufered)
Speeds (in MHz)
Ranks per DIMM
(any combination;
SR=Single Rank,
DR=Dual Rank,
QR=Quad Rank)
2
1
Unb. DDR3 ECC
800,1066,1333
SR or DR
2
2
Unb. DDR3 ECC
800,1066
Mixing SR, DR
Note 1:
1333 MHz for two DIMMs per channel is supported when Unbuf./ECC DIMMs are used.
Note 2:
Mixing of 1.35V and 1.5V DIMMs is not recommended.
Notes: 1
: Due to OS limitations, some operating systems may not show
more than 4 GB of memory.
2
: Due to memory allocation to system de-
vices, 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.
Possible System Memory Allocation & Availability
System Device
Size
Physical Memory (4 GB Total memory)
Remaining (-Available)
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