I used the 1060 on an old PC where I shared power use and more. The PSU was the stock PSU in some HP and 350W. There was no issues there and you have a larger PSU.
I suggest you forget the Seagate. Get anything else.
I'm building a pc (I already have 2x4gb so that's why it says 4x4gb) and was curious to know if these parts are compatible. More importantly if the power supply will be enough https://nz.pcpartpicker.com/list/89cFFt

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