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Whilst there indeed is no performance difference, a gen3 riser can result in a real headache. As mentioned the bios PCIE link speed needs to be set to gen3. If your bios resets for any reason (i.e. updating it, ram issues), it will default back to PCIE link speed: auto. To fix this, you'd either need a gen3 GPU, or you'll need to disassemble your system, plug the GPU in directly, and set the PCIE link speed to gen3 again.