Asus NCCH-DR NCCH-DR User Manual English Version - Page 36

2.4 System memory 2.4.1 Overview The motherboard comes with four Double Data Rate (DDR) Dual Inline Memory Modules (DIMM) sockets. The following figure illustrates the location of the DDR DIMM sockets: 104 Pins 80 Pins NCCH-DR NCCH-DR 184-Pin DDR DIMM sockets DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2 2.4.2 Memory configurations You may install 128 MB, 256 MB, 512 MB and 1 GB unbuffered ECC or non-ECC DDR DIMMs into the DIMM sockets. • Installing DDR DIMMs other than the recommended configurations may cause memory sizing error or system boot failure. Use any of the recommended configurations in Table 1. • 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 DDR Qualified Vendors List on the the ASUS website for details. • In dual-channel configurations, install only identical (the same type and size) DDR DIMM pairs on each channel. • Due to chipset resource allocation, the system may detect less than 4 GB system memory when you installed four 1 GB DDR memory modules. • Three DDR DIMMs installed into any three memory sockets will function in single-channel mode. 2-16 Chapter 2: Hardware information