The socket closest to the standard memory will not accept modules of higher than 4MB capacity.
CPU Type
33MHz Intel i486SX
Model Comments
400MHz FSB
Compaq Presario 633 can be upgraded to a maximum memory of
56 MB , this system has 4 sockets to install
Memory and comes already installed with 4 MB (non-removable) of standard Memory. Compaq Presario 633 takes The socket closest to the standard memory will not accept modules of higher than 4MB capacity. . You may choose the following Memory Upgrades.