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I'm not confident that would work using an external power source while still connected to the motherboard bus via the riser cable. Wouldn't the system still try and provide voltage via the PCIe port? It doesn't know the difference between a riser card or normal GPU. Usually an eGPU that has independent external power would connect via Thunderbolt. If it did work, it would likely cause your power management system to shit its pants.
The more I think about it, the more it sounds impossible for voltage reasons.
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