4 system memory, 1 overview, System memory -11 2.4.1 – Asus P5QC User Manual
Page 37: Overview -11

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