Does PCI-X Work in PCI Slots?

PCI-X is a computer bus and expansion card standard that enhances the 32-bit PCI local bus for higher bandwidth demanded by servers and workstations. It was developed by IBM, Intel, and a consortium of companies.

The PCI-X standard is fully backward compatible with the original PCI specification.

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The original PCI bus ran at 33 MHz with a maximum bandwidth of 133 MB/s. It was later improved to run at 66 MHz with a maximum bandwidth of 266 MB/s. The first version of PCI-X ran at 133 MHz with a maximum bandwidth of 1064 MB/s.

The second version, PCI-X 2.0, increased the maximum clock frequency to 266 MHz with a maximum bandwidth of 2133 MB/s.

PCI-X slots are physically larger than standard PCI slots, so they cannot be used in standard PCI slots. However, some motherboards have both types of slots and support both standards.

Conclusion:

No, PCI-X does not work in standard PCI slots.