Kontron KT965 Series - Manual (Page 16)

KT965 Family
KTD-00699-S Public User Manual Date: 2010-04-15 Page 16 of 90
3.4 System Memory support
The KT965 boards have four onboard DDR2 DIMM sockets and support the following memory features:
• 1.8V (only) 240-pin DDR2 SDRAM DIMMs with gold-plated contacts
• DDR2 800 (PC6400), DDR2 667 (PC5300) or DDR2 533 MHz (PC4200) SDRAM DIMMs
• DDR2 800 DIMMs with SPD timings of only 5-5-5 or 6-6-6 (tCL-tRCD-tRP)
• Unbuffered, single-sided or double-sided DIMMs with the following restriction: Double-sided DIMMs
with x16 organization are not supported.
• 8 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 (Shared Video Memory is withdrawn).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(Shared Video Memory is withdrawn).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 DDR2 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.
Important: If only one Memory module is used then use DDR2 SLOT 1.
3.4.1 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 DDR2 800 memory is used with a 533 MHz system bus frequency
processor, the memory will operate at 533 MHz. The table below lists the resulting operating memory
frequencies based on the combination of DIMMs and processors.
DIMM Type Processor system
bus frequency Resulting memory
frequency
DDR2 533 533 MHz 533 MHz
DDR2 533 800 MHz 533 MHz
DDR2 533 1066 MHz 533 MHz
DDR2 667 533 MHz 533 MHz
DDR2 667 800 MHz 667 MHz
DDR2 667 1066 MHz 667 MHz
DDR2 800 533 MHz 533 MHz
DDR2 800 800 MHz 800 MHz
DDR2 800 1066 MHz 800 MHz
3.4.2 Memory Configurations
The KT965 boards support the following three types of memory organization:
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.
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 are unequal. 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.