Due to this fact, you shouldn't overestimate the possibility of tuning your system and processor clock speed. Usually, though, no problems will arise with the installation of an upgrade card. To be sure that everything works, press the reset button on the mainboard after the installation - sometimes a computer doesn't accept the changed clock speeds right away. With both of Newer Technology's G3 cards you can dismantle a metal plate to give them the right height. Most of the other cards have the same height as Apple's and are therefore too high to fit into Power Computing's chassis.
Many manufacturers especially offer smaller variants, though.
Just pull the cache module out of its slot and try again. If things run smoothly now you need a new cache module. Fortunately, Motorola and Apple offer cache modules without a driver chip. Also benevolent are cache RAMs soldered on the mainboard. More on this topic in part two of our series.