Figure 4-5 Do not remove the DIMM in slot #4. Figure 4-6 Do not remove the DIMM in slot #3. CAUTION The HP Color LaserJet 4500 printer uses 100-pin, non-parity, synchronous SDRAM DIMMs. The HP Color LaserJet 4550 printer uses 168-pin, non-parity, synchronous DRAM DIMMs; EDO DIMMs are not supported in either the HP Color LaserJet 4500 printer or the 4550 printer. To ensure you are using the correct DIMM, see figure 4-7. EDO SDRAM Figure 4-7 EDO and SDRAM memory modules C7085-90921 Chapter 4 Printer maintenance 99