1.7.2 Memory configurations Asus prime Asus M3A78-EM

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•  When using only one memory module, start installing the DDR2 DIMM from 

slot DIMM_A1 or DIMM_B1 for better overclocking capability. 

•  For dual-channel configuration (2), you may: 

-  install identical DIMMs in all four sockets OR  

-  install identical DIMM pair in DIMM_A1 and DIMM_B1 (yellow sockets) 


and another identical DIMM pair in DIMM_A2 and DIMM_B2 (black   



•  Always use identical DDR2 DIMM pairs for dual channel mode. For 

optimum compatibility, we recommend that you obtain memory modules 

from the same vendor. 




•   If you are using a Windows 32-bit version operating system (e.g. 32-bit 

Windows XP, 32-bit Vista) without the Physical Address Extension (PAE) 

support, the system will allocate a certain amount of memory space for 

system devices. 

•   We recommend that you install only a maximum of 3GB system memory 

when using a Windows 32-bit version operating system without the PAE. 

The excess over 3GB of installed memory will not cause any problem; 

however, the system can not use this excess memory space and the 

system will display less than the total size of physical memory installed.




 XP Professional x64 Edition



 Vista x64 Edition

The motherboard can support 8 GB physical memory on the operating system 

listed below. You may install a maximum of 2 GB DIMMs on each slot.