550Watt is probably enough if they're both run stock.
I've got a 850 Modular for a similar setup, primarily as I want to reuse/futureproof it if possible.
550W PSUs seem to lack two separate PCI-e power cables, which isn't good thing for high power draw graphics cards.
Cables split in the end compromise stability of 12V and ground reference, because of doubled voltage losses to two separate cables.
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