Intel FSB800 (PC3200) - Manual (Page 26)

Installation
Page 3-8
DIMM Module Installation
Figure 8 displays the notch on the DDR DIMM memory module.
DIMMs have 184 pins and one notch that matches with the DDR DIMM socket.
DIMM modules are installed by placing the chip firmly into the socket and
pressing straight down as shown in figure 9 until the white clips close and the
module fits tightly into the DIMM socket (figure 10).
Figure 8 - DIMM notch
Figure 10 - DIMM module clip after installation
To remove the DIMM module press down the white clips and the module is
released from the socket.
Figure 9 - DIMM module clips before installation
CENTER KEY ZONE
(2.5 V DRAM)