Asus A55M-A/USB3 - Manual (Page 23)

1.5 System memory
1.5.1 Overview
This motherboard comes with two Double Data Rate 3 (DDR3) Dual Inline Memory Modules
(DIMM) sockets.
A DDR3 module has the same physical dimensions as a DDR2 DIMM but is notched
differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are developed for
better performance with less power consumption.
The figure illustrates the location of the DDR3 DIMM sockets:
Channel Sockets
Channel A DIMM_A1
Channel B DIMM_B1
A55M-A/USB3
A55M-A/USB3 240-pin DDR3 DIMM sockets
DIMM_A1 DIMM_B1
ASUS A55M-A Series 1-11