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What is the difference between version 2.3 and version 3.0 of the Conventional PCI? specification?
Version 3.0 is an evolutionary release of the PCI specification that includes edits to provide better readability and incorporate Engineering Change Notices (ECNs) that have been developed since the release of version 2.3. The Conventional PCI 3.0 specification also completes the migration to 3.3V-only slots by removing support for 5.0V-only keyed add-in cards. Version 3.0 is the current standard for Conventional PCI, to which vendors should be developing products
How do ECNs affect the base specification? What ECNs were incorporated into the Conventional PCI 3.0 specification?
ECNs (Engineering Change Notifications) are improvements to the specification that are officially approved, but don't demand a full-scale revision to the specification. The list of ECNs that were incorporated into version 3.0 of the specification is included within the specification.