To offer more purchasing flexibility and reduce waste and cost for customers with other sources for heat sinks, the Intel? Xeon? processor 5500 series no longer includes a heat sink in the box. The boxed Intel? Thermal Solution STS100 series is available through the same distributors and offers the same three-year limited warranty as boxed processors.This change applies only to processors for server/workstation systems with two LGA1366 sockets. The Intel? Xeon? processor 3500 series includes a heat sink for single-socket systems in the box.