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
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