For all its performance gains, PCI-X is being positioned as an interim technology while the three vendors develop a more long-term I/O bus architecture called Future I/O.

• 尽管PCI-X性能有大的改进，它还是定位在一项中期的技术，这三家公司开发了更长期的输入/输出总线结构，称作future I/O。