Asus NRL-LS - Manual (Page 36)

2-10 Chapter 2: Hardware information
2.5.2 Memory Configurations
The motherboard supports system memory of up to 4GB in a one-way
non-interleaved configuration.
Memory configuration table
DIMM Socket 184-pin ECC DDR DIMM Total Memory
DDR1 SDRAM 128MB, 256MB, 512MB, 1GB (x1) =
DDR2 SDRAM 128MB, 256MB, 512MB, 1GB (x1) =
DDR3 SDRAM 128MB, 256MB, 512MB, 1GB (x1) =
DDR4 SDRAM 128MB, 256MB, 512MB, 1GB (x1) =
Total System Memory (Max. 4GB) =
The system chipset only supports PC2100/1600 registered ECC
DIMMs. Make sure to use only the specified DIMM types for stable
system operation.