Asus M3N78 SE - Manual (Page 21)

ASUS M3N78 SE 1-11
1.7 System memory
1.7.1 Overview
The motherboard comes with two Double Data Rate 2 (DDR2) Dual Inline Memory Modules
(DIMM) sockets.
The figure illustrates the location of the DDR2 DIMM sockets:
M3N78 SE
M3N78 SE 240-pin DDR2 DIMM sockets
DIMM_A
1
DIMM_B
1
Channel Sockets
Channel 1 DIMM_A1
Channel 2 DIMM_B1
• You may install varying memory sizes in Channel A and Channel B. The system maps
the total size of the lower-sized channel for the dual-channel configuration. Any excess
memory from the higher-sized channel is then mapped for single-channel operation.
• Always install DIMMs with the same CAS latency. For optimum compatibility, we
recommend that you obtain memory modules from the same vendor. Refer to the
DDR2 Qualified Vendors List on the next page.
• Due to the memory address limitation on 32-bit Windows OS, when you install 4GB or
more memory on the motherboard, the actual usable memory for the OS can be about
3GB or less. For effective use of memory, we recommend that you install a 64-bit
Windows OS when having 4GB or more memory installed on the motherboard.
• This motherboard does not support memory modules made up of 126 MB chips
1.7.2 Memory configurations
You may install 512MB, 1GB, 2GB, and 4GB unbuffered ECC/non-ECC DDR2 DIMMs into
the DIMM sockets.