Asus P6TD Deluxe - Manual (Page 40)

2.4 System memory
2.4.1 Overview
The motherboard comes with six 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:
Due to Intel CPU spec definition, the system will not boot if only one DIMM
is installed in DIMM slot A2, B2, or C2. Follow the illustrations above for
recommended memory configuration.
Recommended memory configurations
One DIMM:
You may install one memory module in slot A1, B1 or C1 as a single-channel
operation.
Four DIMMs (Triple-channel operation):
Two DIMMs (Dual-channel operation): Three DIMMs (Triple-channel operation):
Six DIMMs (Triple-channel operation):
2-12 Chapter 2: Hardware information