Is the PCI-E Express Gen 4.0 Riser Extender compatible with older PCI-E devices?

Yes, it supports PCI-E 4.0 devices and is backwards compatible with PCI-E 3.0.

What is the bandwidth capacity of the PCI-E Express Gen 4.0 16x Riser Extender?

The bandwidth capacity is 64GB/S bidirectional.

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Full Speed PCI-E Express Gen 4.0 16x Riser Extender Silver-Plated Shielded Cord PCIe4.0 for Vertical Riser Cable Graphics Card(30CM)

Full Speed PCI-E Express Gen 4.0 16x Riser Extender Silver-Plated Shielded Cord PCIe4.0 for Vertical Riser Cable Graphics Card(30CM)