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PCIe® Base Specification 1.1
PCIe Card Electromechanical Specification 1.1
PCIe Mini Card Electromechanical Specification 1.2


The PCI Express® 1.1 updates include the Base, the Card Electromechanical and the Mini Card Electromechanical specifications. These three specifications have been updated with clarifications and several improvements that reflect the industry’s combined design experience of the past two years. These updated specifications are fully compatible with the PCI Express 1.0a specifications. The PCI-SIG is planning to release complementary PCI Express 1.1 compliance material towards the end of 2005.

PCI Express 1.0a specifications may be downloaded from the PCI Express Archive. Additionally, the PCIe Mini Card Electromechanical Specification 1.1 specification is also available from the PCI Express Archive.

Below are the PCI Express 1.1 Specifications, including both the official specification as well as "change bar" versions for ease of comparison.

PCI Express Base Specification 1.1

PCI Express Card Electromechanical Specification 1.1

PCI Express Mini Card Electromechanical Specification 1.2

Mobile Graphics Low-Power Addendum 1.0

To view archived copies the PCI Express 1.0a Specifications, the PCI Express Mini Card Electromechanical 1.1 specification and ECNs, visit the PCI Express Base Archive.

Be sure to check the list of PCI Express ECNs for the latest updates for this specification.