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ASUS A7N266-E User’s Manual 21
3. HARDWARE SETUP
System Memory
3. H/W SETUP
3.5 System Memory
3.5.1 DDR DIMM Support
The three DDR DIMM sockets support 2.5Volt (power level) Double Data Rate
Synchronous Dynamic Random Access Memory (DDR SDRAM) of 64MB, 128MB,
256MB and 512MB to form a memory size between 64MB to 1.5GB. One side (with
memory chips) of the DIMM takes up one row on the motherboard.
TwinBank
™
Technology: to function at 128-bit, 4.2 GB/second “Dual channel DDR
mode”, at least 2 or more DIMM modules must be installed; with only one DIMM
installed, the memory functions at only 64-bit, normal mode.
~ DDR DIMMs on this motherboard support only 184-pin, unbuffered, non-ECC
memory. DDR DIMMs with CAS Latency of 2.0 (PC2100A) or 2.5 (PC2100B) are
both supported. (See the General DIMM memo on page 27 for details.)
Configuration Rules:
1. DIMMs must be populated consecutively, in order, starting with DIMM Socket
1, then 2 and 3.
2. The total number of banks must not exceed five: ie.: two dual load modules and
one single load module. Note: Do not populate DIMM Socket 3 with any dual
load modules.
Memory Population:
Memory loads must be distributed according to the various possible combinations
shown in the following table:
Capacity DIMM 1 (A0) DIMM2 (B0) DIMM3 (B1)
128 MB 64MB - 1B or 2B 64MB - 1B or 2B X
192 MB 128MB - 1B or 2B 64MB - 1B or 2B X
256 MB 128MB - 1B or 2B 128MB - 1B or 2B X
128MB - 1B or 2B 64MB - 1B or 2B 64MB - 1B
384 MB 256MB - 1B or 2B 128MB - 1B or 2B X
128MB - 1B or 2B 128MB - 1B or 2B 128MB - 1B
512 MB 256MB - 1B or 2B 256MB - 1B or 2B X
256MB - 1B or 2B 128MB - 1B or 2B 128MB - 1B
786 MB 512MB - 1B or 2B 256MB - 1B or 2B X
256MB - 1B or 2B 256MB - 1B or 2B 256MB - 1B
1 GB 512MB - 1B or 2B 512MB - 1B or 2B X
512MB - 1B or 2B 256MB - 1B or 2B 256MB - 1B
1.25 GB 512MB - 1B or 2B 512MB - 1B or 2B 256MB - 1B
1.5 GB 512MB - 1B or 2B 512MB - 1B or 2B 512MB - 1B
Table Legend:
1B = 1 bank: a single load module. 2B = 2 bank: a dual load module.