MemoryTen is a leader in the PC2100 Memory DDR 266 184 pin ECC upgrade market. Offering dependable PC 2100 memory ECC 266MHz upgrades ranging from 256MB, 512MB and 1GB all carring a lifetime warranty. Memory modules on this page are 266MHz ECC (Error correcting code). Logic designed to detect and correct memory errors. They are designed for desktop computers and are 184 pin. Memory X combines the strengths of quality, service, upgrade experience, and price to provide the best choice in memory upgrades.