Asus RS120-E4/PA4 - Manual (Page 25)

2-9 ASUS RS120-E4/PA4
2.3 System memory
2.3.1. DIMM.sockets.location
The system motherboard comes with four Double Data Rate II (DDR2) Dual Inline
Memory Modules (DIMM) sockets to support 240-pin DDR2 modules.
The figure illustrates the location of the DDR2 DIMM sockets:
2.3.2 Memory configurations
You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC or non-ECC
DDR2-533/667 DIMMs to the DIMM sockets.
• Always install DIMMs with the same CAS latency. For optimum compatibility,
it is recommended that you obtain memory modules from the same vendor.
Visit the ASUS website for an updated DDR2 Qualified Vendors List for this
motherboard.
• Due to chipset resource allocation, and depending on the number of
expansion cards installed, the following conditions may occur:
- the system may detect less than 8 GB system memory when
you installed four 2 GB DDR2 memory modules
- may show an available memory space of less than 4 GB when
you installed four 1 GB DDR2 memory modules
• Three DDR2 DIMMs installed into any three memory sockets will function in
Dual channel asymmetric mode.
• When installing a single or two DIMMs, install the modules on the blue slots
(DIMM_A1/DIMM_B1). Refer to the recommended memory configuration
table below.
P5M2-R
®
P5M2-R.240-pin.DDR2.DIMM.sockets
DIMM_A1 DIMM_B2 DIMM_B1 DIMM_A2
112 Pins
128 Pins
Recommended memory configurations
Mode Single channel mode Dual channel mode
Dual channel
(asymmetric mode)
Number of memories 1 1 2 4 3
DIMM socket
DIMM_A1 V V V V
DIMM_A2 V V
DIMM_B1 V V V V
DIMM_B2 V