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Buy with Confidence.

We
guarantee your memory upgrade will be 100% compatible, or return it within 30 days for a full refund.
System Specifications
Comments:MODULES MUST BE ORDERED AND INSTALLED IN PAIRS.
KTH-LJ4100/128 (HP C9121A) is not supported on the Color LaserJet 8550 series.
Standard Memory:128MB (Removable)
Maximum Memory:512MB
Expansion:8 Sockets (4 banks of 2)
CPU/Chipset:HP PA-RISC 300 MHz
Upgrade Path:Virtually any configuration up to 512MB can be reached using 64MB modules IN PAIRS.