Chapter 2: Installation
2-13
1.35V UDIMM Population for the Motherboard w/5600 Processors Installed
DIMM
Slots per
Channel
DIMMs
Populated
per Channel
DIMM Type (Unb.=
Unbuffered)
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.
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 mem-
ory 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 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-M
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
