Asus A8N5X A8N5X User's Manual for English Edition - Page 27

1.7 System memory 1.7.1 Overview The motherboard comes with four 184-pin Double Data Rate (DDR) Dual Inline Memory Modules (DIMM) sockets. The following figure illustrates the location of the sockets: DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2 A8N5X ® A8N5X 184-pin DDR DIMM sockets Channel Channel A Channel B Sockets DIMM_A1 and DIMM_A2 DIMM_B1 and DIMM_B2 1.7.2 Memory Configurations You may install 256 MB, 512 MB and 1 GB unbuffered ECC or non-ECC DDR DIMMs into the DIMM sockets using the memory configurations in this section. • For dual-channel configuration, the total size of memory module(s) installed per channel must be the same for better performance (DIMM_A1+DIMM_A2=DIMM_B1+DIMM_B2). • When using one DDR DIMM module, install into DIMM_B1 slot only. • When using two DDR DIMM modules, install into DIMM_A1 and DIMM_B1 slots only. • Always install DIMMs with the same CAS latency. For optimum compatibility, it is recommended that you obtain memory modules from the same vendor. Refer to the DDR400 Qualified Vendors List on the next page for details. • Due to chipset resource allocation, the system may detect less than 4 GB of system memory when you installed four 1 GB DDR memory modules. • Due to CPU limitation, DIMM modules with 128 Mb memory chips or double-sided x16 memory chips are not supported in this motherboard. ASUS A8N5X 1-13