Asus T4-P5P43 - Manual (Page 36)

2-16 Chapter 2: Basic installation
2.6.2 DIMM installation
To install a DDR2/DDR3 DIMM:
1. Locate the two DIMM sockets on the motherboard.
2. Unlock a socket by pressing the retaining clips
outward.
A DIMM is keyed with a notch so that it fits in only one direction. DO NOT force
a DIMM into a socket to avoid damaging the DIMM!
4. Firmly insert the DIMM into the socket until the
retaining clips snap back in place and the DIMM
is properly seated.
3. Align a DIMM on the socket such that the notch
on the DIMM matches the break on the socket.