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Hey man, I got the same card. What kind of cables did you get for it?
Are you using ther SATA power ones? I use all 4 drives in the MacPro, so don't have an open SATA power source...
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There are 2 pcie power leads on the motherboard right next to the pcie slots. It's for the graphics card. 280x uses both of them.
Get whatever spec cable it needs. I think they are 6pin pcie power.
I use hdx cards so that used my power leads. So I got an external power supply.
I actually just got a rx580 pulse. For Mojave. But the 280x is also Mojave compatable so it works too.