Intel Desktop Board DP43BFL LGA775 Socket P43 ATX BOXDP43BFL User Manual

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The Intel 82P43 MCH 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. 

 

Memory Configuration Examples 

http://www.intel.com/support/motherboards/desktop/sb/
cs-011965.htm