NEC Silentwriter SuperScript 610plus User Manual page 254

B–4 Optimizing Printer Performance
8. Install the memory expansion module on your
printer
The SuperScript printer provides maximum
6PPM printing. However a less powerful CPU or
insufficient printer memory may restrain the
throughput.
If your computer has a powerful CPU, installing
the memory expansion module may improve the
throughput. (See Appendix F "Installing the
Memory Expansion Module".)