AlphaServer ES40 667 and 833 MHz CPU Upgrade

This document is an upgrade guide for Compaq AlphaServer ES40 systems, detailing the process to upgrade CPUs to either 667 MHz or 833 MHz.

It is intended for technically trained customers and field service personnel. A critical prerequisite is that the system's motherboard must be a minimum revision of E01 (for part number 54-25385-01) or A01 (for 54-25385-02); the document provides instructions to check the motherboard revision and advises contacting Compaq Field Service for free replacement if an older revision is present.

The upgrade process involves replacing all existing 500 MHz CPUs with new ones, ensuring all new CPUs are of the same speed (either all 667 MHz or all 833 MHz) as mixing speeds is not supported. The procedure includes updating firmware, physical CPU card replacement, and post-upgrade verification steps. Safety warnings and a list of required tools are also provided.