Product Description
17
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
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
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.
