You might wonder what a mainframe server is used for? While its use is limited, a mainframe server can be used as a file server for a very large organization (this usually means the government or government contracted organizations). Large universities and research organizations also use mainframes for various projects. Mainframes can be clustered together to harness the power of multiple servers and perform a single task. Cancer researchers use clusters of IBM servers to perform linear algebra and other mathematical operations needed to complete research. On the fun side, Sun Microsystems is now leasing their enterprise servers to certain groups such as animators and graphics producers to perform rendering.