Asus P5N-E SLI - Manual (Page 31)

ASUS P5N-E SLI 1-17
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:
Channel Sockets
Channel A DIMM_A1 and DIMM_A2
Channel B DIMM_B1 and DIMM_B2
1.7.2 Memory configurations
You may install 256 MB, 512 MB, 1 GB and 2 GB unbuffered non-ECC DDR2
DIMMs into the DIMM sockets.
• For dual-channel configuration, the total size of memory module(s)
installed per channel must be the same
(DIMM_A1 + DIMM_A2 = DIMM_B1 + DIMM_B2).
• Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules from
the same vendor. Refer to the DDR2 Qualified Vendors List on the next
page for details.
• Due to chipset resource allocation, the system may detect less than 8
GB system memory when you installed four 2 GB DDR2 memory modules.
• If you install four 1GB memory modules, the system may only recognize
less than 3 GB because the address space is reserved for other critical
functions. This limitation appears on Windows ® XP 32-bit operation
system which does not support Physical Address Extension (PAE).
• If you install Windows ® XP 32-bit operation system, a total memory of
less than 3GB is recommended.
P5N-E SLI
R
P5N-E SLI 240-pin DDR2 DIMM Sockets
128 Pins
112 Pins
DIMM_A2 DIMM_B1 DIMM_B2 DIMM_A1