This paper focuses on extending the memory subsystem by integrating a prefetch buffer mechanism. Prefetching allows high-level application knowledge to increase memory performance, which is currently constraining the performance of most system. While prefetching does not reduce the latency of memory accesses, it hides this latency by overlapping memory access and instruction execution. The first prefetch operation to the buffer is initiated by an explicit fetch instruction. All further prefetch operations are issued automatically whenever a prefetched value is consumed. To efficiently support list and vector processing, the user can specify a stride value at the time the first prefetch operation is initiated.