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The Intel Pentium III Xeon is the workstation and server variant of the Pentium III introduced in 1999, based on the P6 microarchitecture and therefore retaining dynamic out-of-order execution, register renaming, speculative execution, and micro-op translation while adding SSE support and targeting higher-end multiprocessor platforms. Unlike mainstream Pentium III models for Slot 1 or Socket 370, the Pentium III Xeon uses Slot 2 packaging to support larger external L2 cache configurations, with early Katmai-based versions built on a 0.25 µm process and offered with 512 KiB, 1 MiB, or 2 MiB of half-speed backside cache. Later Cascades versions moved to a 0.18 µm process while preserving Slot 2 and improving power efficiency and clock scaling, though they still relied on off-die L2 cache rather than the integrated cache approach used by Coppermine. Technically, the Pentium III Xeon is best understood as the final high-end Slot 2 implementation of the P6 family, optimized for cache-heavy workstation and server workloads rather than cost-sensitive desktop systems.