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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 (Shared Video Memory is withdrawn).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(Shared Video Memory is withdrawn).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.

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KT965 Family 1

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