Apple Power Macintosh 4400 - Manual (Page 171)

Removing a DRAM DIMM
To upgrade your computer to the maximum amount of memory, you may
want to replace the DRAM DIMM that comes preinstalled in your computer
with one of a higher capacity. To do this, you’ll need to remove the existing
DIMM following the instructions provided in this section, then install a
higher capacity DIMM following the instuctions in “Installing a DRAM
DIMM,” next in this appendix.
To remove a DRAM DIMM, follow these instructions:
1 Push the ejector on the DRAM slot outward and down to open it.
Your socket may have one or two ejectors.
171 Installing Expansion Cards and Additional Memory