对于普通用户来说，主板上自带的一条PCIe x16插槽就够用了，但如果有独立网卡，独立声卡等设备，或是需要更多的扩展，就需要选择提供更多PCIe插槽的主板，而且PCIe插槽的通道带宽也不能少。

盖世汽车讯 ...

The Renesas PCIe 4.0 Dual Mode Link Controller IP is compliant with the "PCI Express (PCIe) 4.0 Base Specification". This IP supports the major functions required as PCIe link IP for embedded systems.

This is the maximum amount specified by the PCI Express standard for a x16 slot (PCIe 4.0 and 5.0 spec). If a graphics card requires more power, it will typically have additional power connectors ...

Silverstone has released a PCIe 4.0 add-in card, giving systems four additional M.2 slots for expanded M.2 storage.