Asus P3-P5G31 - Manual (Page 26)

2-10 Chapter 2: Basic installation
2.5 Installing a DIMM
The motherboard comes with two 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
Channel B DIMM_B1
R
240-pin DDR2 DIMM Sockets
128 Pins
112 Pins
DIMM_B1 DIMM_A1
Install a memory module in DIMM_A1 slot to support the Intel ® Quiet System
Technology and for optimum performance.