Which memory technology requires that either all memory slots are populated or a continuity module?

Rambus memory technology, specifically Rambus Dynamic Random Access Memory (RDRAM), is designed with a unique architecture that requires all memory slots on the motherboard to be filled for proper operation. This means that if a user wants to install RDRAM, they must either populate each available RAM slot with RDRAM modules or use a continuity module in any unoccupied slots. The continuity module is a special type of RAM module that ensures the electrical signaling remains stable across all memory channels, even if full capacity is not being utilized.

This requirement is a distinctive feature of Rambus memory, differentiating it from other memory technologies like DDR or SDRAM, which can function with fewer populated slots. Using the correct memory configurations is essential for system stability and performance, which is why understanding the specific requirements of each memory type is critical for effective PC assembly and upgrades.