Asus P5QC - Manual (Page 37)

ASUS P5QC 2-11
2.4 System memory
2.4.1 Overview
The motherboard comes with two Double Data Rate 3 (DDR3) and four Double
Data Rate 2 (DDR2) Dual Inline Memory Modules (DIMM) sockets.
A DDR3 module has the same physical dimensions as a DDR2/DDR DIMM but
is notched differently to prevent installation on a DDR2/DDR DIMM socket, while
a DDR3/DDR2 module has a 240-pin footprint compared to the 184-pin DDR
DIMM. DDR3 modules are developed for better performance with less power
consumption. The figure illustrates the location of the DDR3/DDR2 DIMM sockets:
Channel Sockets
Channel A DIMM_A1 and DIMM_A2
Channel B DIMM_B1 and DIMM_B2
DDR3 module installation
DDR2 module installation
• You can only install either DDR2 module(s) or DDR3 module(s) on the
motherboard; otherwise, the system will not boot up.
• DDR2 1066MHz DIMMs work only on the black slots for one DIMM per
channel. Ensure to install the DDR2 1066MHz DIMMs ONLY on the BLACK
slots!
Channel Sockets
Channel A DDR3_DIMM_A1
Channel B DDR3_DIMM_B1