System Memory Support - Kontron KTQ45/Flex User Manual

KTD-00782-H
2.4

System Memory support

The KTQ45 boards have four onboard DDR3 DIMM sockets and support the following memory features:
DDR3-800/1066 DIMM 240pin DRAM modules (PC3-6400/PC3-8500)
·
1.5V (only) 240-pin DDR3 SDRAM DIMMs with gold-plated contacts
·
DDR3-800 (PC3-6400), DDR3-1066 (PC3-8500) SDRAM DIMMs
·
DDR3-800/1066 DIMM with SPD timings supported
·
Unbuffered, single-sided x8/x16 or double-sided x8/x16 DIMMs
·
16 GB (4 x 4GB) maximum total system memory using 64-bit OS. (Shared Video Memory is
withdrawn).
·
4 GB maximum total system memory using 32-bit OS. ~3GB is displayed in System Properties.
(Shared Video Memory is withdrawn).
·
Minimum total system memory: 512 MB
·
Non-ECC DIMMs
·
Serial Presence Detect
The installed DDR3 SDRAM should support the Serial Presence Detect (SPD) data structure. This allows the
BIOS to read and configure the memory controller for optimal performance. If non-SPD memory is used, the
BIOS will attempt to configure the memory settings, but performance and reliability may be impacted.
Memory Operating Frequencies
Regardless of the DIMM type used, the memory frequency will either be equal to or less than the processor
system bus frequency. For example, if DDR3 800 memory is used with an 800 MHz system bus frequency
processor, the memory clock will operate at 400 MHz. The table below lists the resulting operating memory
frequencies based on the combination of DIMMs and processors.
DIMM Type Module
name
DDR3 800 PC3-6400
DDR3 800 PC3-6400
DDR3 800 PC3-6400
DDR3 1066 PC3-8500
DDR3 1066 PC3-8500
DDR3 1066 PC3-8500
Notes: Kontron offers the following memory modules:
· P/N 1028-6891, DDR3-RAM, 1GB, 240p, 800MHZ, PC3-8500, DIMM
· P/N 1028-6892, DDR3-RAM, 2GB, 240p, 800MHZ, PC3-8500, DIMM
· Faster RAM like PC3-10600 can be used but will run at lower speed.
Memory Configurations
The KTQ45 boards support the following three types of memory organization:
1. Dual channel (Interleaved) mode. This mode offers the highest throughput. Dual channel mode is enabled
when the installed memory capacities of both DIMM channels are equal. Technology and device width can
vary from one channel to the other but the installed memory capacity for each channel must be equal. If
different speed DIMMs are used between channels, the slowest memory timing will be used.
2. Single channel (Asymmetric) mode. This mode is equivalent to single channel bandwidth operation. This
mode is used when only a single DIMM is installed or the memory capacities of channel A is bigger than of
channel B. Technology and device width can vary from one channel to the other. If different speed DIMMs
are used between channels, the slowest memory timing will be used.
3. Flex mode. This mode provides the most flexible performance characteristics and is used if both channels
are populated and at the same time the memory capacities of channel A is smaller than of channel B.
KTQ45 family
Memory Processor
Data system bus
transfers frequency
[Mill/s] [MHz]
800 800
800 1066
800 1333
1066 800
1066 1066
1066 1333
Resulting Peak
memory clock rate
frequency
[MHz] [MB/s]
400 6400
400 6400
400 6400
400 6400
533 8533
533 8533
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