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Intel
®
Compute Module MFS2600KI TPS Functional Architecture
Revision 1.0 15
Intel order number: G51989-002
Supported and Validated
3.4.2 Publishing Compute Module Memory
The BIOS displays the “Total Memory” of the compute module during POST if Display
Logo is disabled in the BIOS setup. This is the total size of memory discovered by the
BIOS during POST, and is the sum of the individual sizes of installed DDR3 DIMMs in
the system.
The BIOS displays the “Effective Memory” of the compute module in the BIOS setup.
The term Effective Memory refers to the total size of all DDR3 DIMMs that are active (not
disabled) and not used as redundant units.
The BIOS provides the total memory of the compute module in the main page of the
BIOS setup. This total is the same as the amount described by the first bullet above.
If Display Logo is disabled, the BIOS displays the total system memory on the diagnostic
screen at the end of POST. This total is the same as the amount described by the first
bullet above.
3.4.3 Memory Map and Population Rules
The following are generic DIMM population requirements that generally apply to the Intel
®
Compute Module MFS2600KI.
DIMM slots on any memory channel must be filled following the “farthest fill first” rule.
A maximum of eight ranks can be installed on any one channel, counting all ranks in
each DIMM on the channel.
DIMM types (UDIMM, RDIMM, LRDIMM) must not be mixed within or across processor
sockets.
Mixing ECC with non-ECC DIMMs (UDIMMs) is not supported within or across
processor sockets.
Mixing Low Voltage (1.35V) DIMMs with Standard Voltage (1.5V) DIMMs is not
supported within or across processor sockets.
Mixing DIMMs of different frequencies and latencies is not supported within or across
processor sockets.
LRDIMM Rank Multiplication Mode and Direct Map Mode must not be mixed within or
across processor sockets.
Only ECC UDIMMs support Low Voltage 1.35V operation.
QR RDIMMs may only be installed in DIMM Slot 1 or 2 on a channel.
Two DPC QR Low Voltage RDIMMs are not supported.
In order to install 3 QR LRDIMMs on the same channel, they must be operated with
Rank Multiplication as RM = 2.
RAS Modes Lockstep, Rank Sparing, and Mirroring are mutually exclusive in this BIOS.
Only one operating mode may be selected, and it will be applied to the entire system.
If a RAS Mode has been configured, and the memory population will not support it
during boot, the system will fall back to Independent Channel Mode and log and
display errors