Memory Configurations - Asus Motherboard NR-LSR User Manual

2.5.2 Memory configurations

The motherboard supports system memory of up to 8GB in a two-way
interleaved configuration. As a rule, this configuration requires that you
install identical DDR DIMMs (exactly the same type and size) in pairs. For
example, if you installed a 512MB module into DDRA1, you must install
the same type of 512MB module into DDRB1. The same rule applies to
pair DDRA2/DDRB2.
An exception to the above rule allows you to install one DDR DIMM
into DDRA1 socket (the socket farthest from the edge of the
motherboard). Installing a single DIMM into any other socket would not
work.
The following table lists the DIMM socket pairs and the memory modules
that you can install.
Memory configuration table
DIMM Socket
DDRA1 SDRAM 128MB, 256MB, 512MB, 1GB, 2GB
DDRB1 SDRAM 128MB, 256MB, 512MB, 1GB, 2GB
DDRA2 SDRAM 128MB, 256MB, 512MB, 1GB, 2GB
DDRB2 SDRAM 128MB, 256MB, 512MB, 1GB, 2GB
Total System Memory (Max. 8GB)
The system chipset only supports PC2100/1600 registered ECC
DIMMs. Make sure to use only the specified DIMM types for stable
system operation.
ASUS NR-LSR motherboard user guide
184-pin ECC DDR DIMM Total Memory
x1
x1
x1
x1
=
2-9