Thanks xStainDx and crusher. PCI-SIG delivered yet another specification of conventional PCI bus that has been around for over a decade already. The new revision does not bring any speed boosts to the standard, but only continues some evolutionary ideas of the previous versions.
The PCI-SIG, also known as the Special Interest Group responsible for Conventional PCI, PCI-X, and PCI Express industry-standard I/O technologies quietly released version 3.0 of the Conventional PCI specification. Revision 3.0 is the latest version of the Conventional PCI specification that builds upon version 2.3 and completes the migration of the PCI bus from the original 5.0V (volt) signaling to 3.3V-only slots.
As semiconductor signaling technologies have progressed since the 1992 release of the Conventional PCI 1.0 spec, the base signaling voltages have dropped from the standard of 5.0V to the current 3.3V. Subsequent Conventional PCI specifications, versions 2.0 and 2.3, responded to industry needs by first enabling 3.3V and then initiating the migration to 3.3V-only slots.