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Thanks, I had forgotten about the useful EPS power option on many thin ITX boards.

As there is an 8 pin PCIe powering the card, that's fine.

Part of me is still concerned that a SATA power cable is being used to supply the 75w base power to the card that would normally come from the board via the direct PCIe slot.

If you had a low power card (up to a 1050Ti/1650 say) that doesn't need a secondary supply to test the slot power that would let you know if it is a power or riser problem.