HP Color LaserJet 4600 Printer series - Manual (Page 107)

ENWW 93
Managing memory
This printer supports up to 512 MB of memory. You can add additional
memory by installing Dual Inline Memory Modules (DIMMs). To allow
for memory expansion, the printer has five DIMM slots, which accept
64, 128, or 256 MB of RAM each. For information about installing
memory, see
Working with memory and print server cards .
The printer features Memory Enhancement Technology (MEt), which
automatically compresses page data to provide the most efficient use
of the printer’s RAM.
The printer uses 168-pin, nonparity, synchronous DRAM memory
modules. Extended data output (EDO) DIMMs are not supported.
Note If memory problems occur when you are printing complex graphics, you
can make more memory available by removing downloaded fonts, style
sheets, and macros from printer memory. Reducing the complexity of
a print job from within an application can help avoid memory problems.