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Thus, a PCI Express 2.0 x16 slot offers a maximum theoretical bandwidth of 8 GiB/s, while a PCI Express 3.0 x16 slot reaches 16 GiB/s.

I have a very simple question: will a PCI Express 2.0 x16 graphics card work in a PCIe x16 slot? I’m not sure about the 2.0.

The easier solution I can think at the moment is a "USB 3.0 PCI-E Express USB 3.0 Expansion Adapter". But the problem is that actually my two PCI-E buses are occupied by the two GPUs I have.