If my GPU requires both a 6 pin and 8 pin connection, do I have to use a dual pci-e 6+2 cable, or can I use two separate cables?

I ordered both a psu and a gpu recently, and I don't think the psu comes with a dual pci-e 6+2 cable, and the gpu needs a 6 and 8 pin connection. Is there any reason why I shouldn't power my gpu with two separate cables, one 6 pin and one 8 pin?
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