Asus M3A78-EMH HDMI User Manual - Page 26
System memory
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1.7 System memory 1.7.1 Overview The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory Modules (DIMM) sockets. A DDR2 module has the same physical dimensions as a DDR DIMM but has a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched differently to prevent installation on a DDR DIMM socket. The figure illustrates the location of the DDR2 DIMM sockets: DIMM_A1 DIMM_B1 DIMM_A2 DIMM_B2 128 Pins 112 Pins M3A78-EMH HDMI M3A78-EMH HDMI 240-pin DDR2 DIMM Sockets Channel Channel 1 Channel 2 Sockets DIMM_A1 and DIMM_A2 DIMM_B1 and DIMM_B2 1.7.2 Memory configurations You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC/non-ECC DDR2 DIMMs into the DIMM sockets. Recommended memory configurations Mode Single-Channel Dual-channel (1) Dual-channel (2) DIMM_A1 - Populated Populated Populated Sockets DIMM_B1 Populated - Populated Populated DIMM_A2 - - - Populated DIMM_B2 - - - Populated 1-14 Chapter 1: Product introduction