User`s guide
Chapter 5: Advanced Serverboard Setup
5-11
Memory Support
The R422-E2/R422-INF-E2 supports up to 48 GB Registered ECC DDR3 1333
MHz/1066 MHz/800 MHz in 12 DIMMs (w/maximum of 8 GB per DIMM). Also,
memory speed support is dependent on the type of CPU used on the board.
DIMM Module Population Conguration
For memory to work properly, follow the tables below for memory installation:
DIMM Population Table
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, 1066 QR
2 2 Reg. DDR3 ECC 800, 1066 Mixing SR, DR
2 2 Reg. DDR3 ECC 800 Mixing SR, DR, QR
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 disproportional.
Possible System Memory Allocation & Availability
System Device Size Physical Memory Available
(4 GB Total System Memory)
Firmware Hub 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 to OS & other applications 2.84 GB