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ASUS CUV266-DLS User’s Manual 23
3. HARDWARE SETUP
System Memory
3. H/W SETUP
3.5 System Memory
This motherboard supports both registered and unbuffered Double Data Rate (DDR)
Dual Inline Memory Modules (DIMMs). Four DDR DIMM sockets are available
for 2.5V (power level) DDR Synchronous Dynamic Random Access Memory (DDR
SDRAM) of 64, 128, 256, 512MB, or 1GB densities for a system memory
configuration up to 4GB.
Install system memory in any combination as follows:
DIMM Location 184-pin DDR DIMM Total Memory
Socket 1 (Rows 0&1) 64MB, 128MB, 256MB, 512MB, (1GB) x1
Socket 2 (Rows 2&3) 64MB, 128MB, 256MB, 512MB, (1GB) x1
Socket 3 (Rows 4&5) 64MB, 128MB, 256MB, 512MB, (1GB) x1
Socket 4 (Rows 6&7) 64MB, 128MB, 256MB, 512MB, (1GB) x1
Total System Memory Using DDR DIMMs (Max. 4GB) =
3.5.1 DDR SDRAM Notes
The DDR SDRAM technology evolved from the mainstream PC66, PC100, PC133
memory known as Single Data Rate (SDR) SDRAM. DDR memory however, has
the ability to perform two data operations in one clock cycle, thus providing twice
the throughput of SDR memory. For example, a 200MHz DDR DIMM will support
a 100MHz memory bus, and a 266MHz DDR DIMM will support a 133MHz memory
bus.
A DDR DIMM has the same physical dimensions as an SDR DIMM, but it has a
184-pin footprint compared to the 164-pin of the SDR DIMM. Also, a DDR DIMM
is single notched while an SDR DIMM is double notched. Therefore, a DDR DIMM
is not backward compatible with SDR, and should be installed only in a socket
specially designed for DDR DIMMs.
DDR DIMMs are available in both unbuffered and registered versions.
IMPORTANT: When planning to use all the DIMM slots (full-load), the 4th
DIMM can only accommodate PC1600.
WARNING! Make sure that the DIMM you use can handle the specified DDR
SDRAM speeds, otherwise, the computer will not boot.