HP C7850-67901 128MB SDRAM DIMM memory module designed for HP Color LaserJet 4550 and 5500 series printers. Features standard 168-pin DIMM form factor and operates at 100MHz, compatible with older enterprise printing systems requiring memory expansion. This module enhances printer performance for high-volume color printing environments by increasing available RAM for complex job processing and larger document handling. Typical installations include corporate print centers and production facilities managing multiple simultaneous print jobs. Tested and guaranteed, available via quote.