Intel DG965RY Product Specification - Page 17
Memory Configurations - supported processors
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Product Description NOTE 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. Table 4 lists the resulting operating memory frequencies based on the combination of DIMMs and processors. Table 4. Memory Operating Frequencies DIMM Type Processor system bus frequency DDR2 533 533 MHz DDR2 533 800 MHz DDR2 533 1066 MHz DDR2 667 533 MHz DDR2 667 800 MHz DDR2 667 1066 MHz DDR2 800 533 MHz DDR2 800 800 MHz DDR2 800 1066 MHz Resulting memory frequency 533 MHz 533 MHz 533 MHz 533 MHz 667 MHz 667 MHz 533 MHz 800 MHz 800 MHz 1.4.1 Memory Configurations The Intel 82G965 GMCH supports the following types of memory organization: • Dual channel (Interleaved) mode. This mode offers the highest throughput for real world applications. 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 for real world applications. 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. • Flex mode. This mode provides the most flexible performance characteristics. The bottommost DRAM memory (the memory that is lowest within the system memory map) is mapped to dual channel operation; the topmost DRAM memory (the memory that is nearest to the 8 GB address space limit), if any, is mapped to single channel operation. Flex mode results in multiple zones of dual and single channel operation across the whole of DRAM memory. To use flex mode, it is necessary to populate both channels. 17