5-12
SUPERSERVER
1027R-WRF USER'S MANUAL
LRDIMM Support on the Intel E5-2600 Series Processor Platform
DIMMs Populated
per DDR Channel
LRDIMM Type
(Load Reduced
DIMM)
POR Speeds (in
MHz)
Ranks per DIMM
(Any Combination)
1
LR ECC DDR3
1066, 1333
QR
2
LR ECC DDR3
1066, 1333
QR
Other Notes and Restrictions
•
For the memory modules to work properly, please install DIMM modules in pairs
(with even number of DIMMs installed).
•
All channels in a system will run at the fastest common frequency.
•
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 disproportional. See the following
table for details.
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