Can I run PCI & PCI-X cards in the same machine?

Yes.  Systems with PCI-X slots are 64-bit as well as backwards compatible for 32-bit cards.

However, one must be aware of the limitations when running simultaneous PCI and PCI-X cards, or PCI-X cards of differing speeds.  The PCI and PCI-X standards are based on a shared bus architecture. This means that when multiple PCI or PCI-X cards are installed in the system on the same bus, they will automatically run at the speed of the slowest card.

For example, in a system with two PCI-X slots, if both a PCI-X 64-bit / 100MHz card and PCI 32-bit / 33MHz card were installed, both cards would run at 33MHz, therefore affecting the performance of the faster card.

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