System Memory Support - Kontron KTGM45/mITX User Manual

KTD-N0793-0
2.4

System Memory support

The KTGM45 board has two 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)
•
DDR3-800/1066 DIMM with SPD timings supported
•
Unbuffered, single-sided x8/x16 or double-sided x8/x16 DIMMs
•
4 GB 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 (Shared Video Memory is withdrawn).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(Shared Video Memory is withdrawn).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 Processor
system bus
frequency
[MHz]
DDR3 800 667
DDR3 800 800
DDR3 800 1066
DDR3 1066 667
DDR3 1066 800
DDR3 1066 1066
Note: 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
Memory Configurations
The KTGM45 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.
Channel B will be divided into two parts. One part of channel B is used together with channel A and mapped
to dual channel operation. The second part of channel B is mapped to single channel operation.
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Memory Resulting
Data memory clock
transfers frequency
[Mill/s] [MHz]
667 333
800 400
800 400
667 333
800 400
1066 533
KTGM45 Users Guide
System specification
Module Peak transfer
name rate
[MB/s]
PC3-5300 5300
PC3-6400 6400
PC3-6400 6400
PC3-5300 5300
PC3-8500 8533
PC3-10600 10600