Acrosser AR-B1894 - Manual (Page 22)

3.3 Main
Memory
AR-B1894 series provide 2 DIMMs (240-pin Dual In-line Memory Module) to
support 1.5V DDRAM (Synchronized DRAM) as on-board main memory. The
maximum memory size is 256 MB ~ 2 GB with using 256MB/512MB/1GB
technology. Supports up to 2 double sided DIMMs at DDR2 533MHz. The
memory architecture adopts 128-bit data interface to support for x8 and x16
DDRAM(DDR2) device width. In addition, it only supports Non-ECC memory.
For system compatibility and stability, don’t use memory module without brand.
You can also use the single or double-side DIMM .The three DIMMs can be out
of order. You can install different size of DDRAM module on DIMM1, DIMM2 or all
to boot up system.
Without out the contact and lock integrity of memory module with socket, it will
impact on the system reliability. Follow normal procedure to install your DDRAM
module into memory socket. Before locking, make sure that the module has been
fully inserted into the DIMM slot.
NOTE: For maintaining system stability, do not change any of DDR2 memory
parameters in BIOS setup to upgrade your system performance without
acquiring technical information.