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Hi, i want to use a Vega 56 in my mac pro 5.1 it has two 8 pin connectors. I have a cable from 2 mini 6 pin to one 8 pin. Is there any cable from 2 sata to 8 pin to connect the second 8 pin on the graphics card? thanks

To get 8 pin power you will need to perform a mod called the Pixlas mod. It’s not overly complicated and if you’re interested here’s a tutorial.