Interesting. I've had no issues with PCIe cards working without the extra power connectors. The 6 Pin connector isn't supposed to be to power the slots. They will work up to 75w per slot (for devices that register themselves as "High Power" devices) without a cable. The 6 pin is for if you need more power than that (i.e. your cards have a 6 or 8 pin power connector, like a GPU or "hefty" HBA, etc.).That same board and CPU, actually. My issue was the lack of a 6 pin PCI-E power connector to enable the PCI-E slots. I couldn’t get any add-in cards to work.
If your cards don't have 8 or 6 pin power connectors on them, they should work. Maybe you have a bad slot, or you've got slot bifurcation (or another setting) set in BIOS in a way that's giving you issues?
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