Asus RS161-E4/PA2 - Manual (Page 26)

Chapter 2: Hardware setup 2-10
2.4.2 Memory Configurations
You may install 256 MB, 512 MB, 1 GB, 2 GB, or 4 GB registered ECC DDR2
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.
Single CPU:
DIMM_A1=DIMM_A2=DIMM_B1=DIMM_B2
Dual CPU:
DIMM_A1=DIMM_A2=DIMM_B1=DIMM_B2=
DIMM_C1=DIMM_C2 =DIMM_D1=DIMM_D2
• Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules
from the same vendor.
Mode DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2
Single channel — populated — —
Dual channel — populated — populated
populated populated populated populated
Recommended memory configuration for CPU1
Mode DIMM_C1 DIMM_C2 DIMM_D1 DIMM_D2
Single channel — populated — —
Dual channel — populated — populated
populated populated populated populated
Recommended memory configuration for CPU2