PCI系统结构中，计算机主板上每个PCI插槽所提供的信号只能直接连接一个PCI元件，这样限制了PC I板卡的功能扩展。
In PCI system, the signals of each PCI slot in a PC main board are only enough for a single PCI component, which limits the function extension.
其中一个插槽可以作为PCI-X插槽，用来安装PCI-X扩展卡，可为您省去购买昂贵的或者自自定义输入输出卡等设备的费用。
One slot can be configured as a PCI-X slot to work with PCI-X expansion cards, allowing you to preserve your investment in expensive or custom I/O cards and devices.
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