Asus M2R-FVM - Manual (Page 26)

1-14 Chapter 1: Hardware information
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/DIMM_A2
Channel B DIMM_B1/DIMM_B2
R
M2R-FVM
M2R-FVM 240-pin DDR2 DIMM Sockets
DIMM_B2 DIMM_A2
112 Pins
128 Pins DIMM_A1 DIMM_B1