What is the type of RAM is in the most expensive computer?

The most expensive computers, often high-performance supercomputers or specialized workstations, typically use advanced types of RAM like DDR4 or DDR5 SDRAM, along with high-capacity options such as HBM (High Bandwidth Memory). These RAM types offer increased bandwidth and efficiency, crucial for handling large datasets and complex computations. Additionally, some systems may utilize ECC (Error-Correcting Code) RAM to enhance reliability in critical applications.