Will my graphics card work in all PCIe slots?

Will my graphics card work in all PCIe slots? pcie 3 slot An x4 PCIe device has a theoretical max transfer rate of MBsec according to wiki pcie slot dimensions PCIe SSD to a PCIe slot, you could also connect a PCIe SSD into a slot What Are PCIe Lanes? PCIe lanes Not all PCIe lanes work the same way —

pcie slot dimensions The QNAP one looks like it is x4 so I would need a ribbon cable and find a way to mount without fitting it in the x1 slot

pcie slot size But what about the fallback to PCIe , for example runs an older AMD or current Nvidia graphics card in such a slot? In order to remain really The adapter card I am looking at can be used in a X4, X8 or X16 PCIe slot and they say I will get up to 32Gbps when it is plugged into a PCIe