What type of memory module is commonly found in legacy systems?

Rambus Dynamic Random Access Memory (RDRAM) was specifically designed to work with high-performance computing applications and was more common in legacy systems during its time due to its high bandwidth capabilities. Although it's less prevalent today, RDRAM was an important component in many devices during the late 1990s and early 2000s, particularly with some Intel chipsets that aimed to utilize its advanced data transfer rates.

Legacy systems often used RDRAM for their critical performance needs, making it a suitable answer in the context of systems designed around technology from that era. Other memory types, while significant, do not capture the specific nuances of legacy architectural choices as directly as RDRAM does, especially when considering systems built to leverage the specifics of memory bandwidth and access times as provided by the RDRAM standard.