That cable splits out one SAS lane from the source device connector to each of the four "breakout" connectors. (see the PDF linked under the Downloads/Documents tab on that page)
I have no idea how or even if that would work with a SAS expander, but you'd only get one lane worth of bandwidth...
More likely because you plugged the 8-pin PCIe power connector from the P/S into the 8-pin CPU power connection on the MB. I still can't figure out how you did that since they are keyed totally different.
Doesn't your P/S have a 24-pin connector? (Edit: No it doesn't, I just looked)
Yes, a standard PC type power supply is what you need for the motherboard. The one you have is only for powering the multiple GPUs in a mining rig.
The 24-pin power connector next to the SATA ports needs a 24-pin power connection from the P/S. Looks like you only have an 8-pin connector attached to it?
The cable you linked to is a reverse breakout cable. It's used to connect a controller card with 4 individual SATA connectors to a backplane with a SFF-8087 connector. You need a forward breakout cable.
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