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You might be interested in the RockPro64 which comes with a PCIe 2.0x4 slot for all your HBA needs.

https://wiki.pine64.org/wiki/ROCKPro64

https://pine64.com/product/rockpro64-4gb-single-board-comput...

The support for PCIe cards is very limited on that board. I've spent too much time trying to get a disk controller to work, and I'm not alone. I ended up buying old server boards with low power xeon processors to accomplish my goal.

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