Asus P4B533 - Manual (Page 38)

2-12 Chapter 2: Hardware information
2.5.4 Removing a DIMM
Follow these steps to remove a DIMM.
1. Simultaneously press the retaining clips outward to unlock the DIMM.
Support the DIMM lightly with your fingers when pressing the retaining
clips. The DIMM might get damaged when it flips out with extra force.
2. Remove the DIMM from the socket.
3. Firmly insert the DIMM into the socket until the retaining clips snap
back in place and the DIMM is properly seated.
Locked Retaining Clip