Atomic Rooster
Omnipotent One
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You don't have to worry about connecting the 12V or 3.3V rails. They are just the power output ratings.
That card does not have an external power connector, so it will get all it's needed power from the PCIe slot. Oh, and XFX only requires a 300W PSU so you'll be good to go.
That card does not have an external power connector, so it will get all it's needed power from the PCIe slot. Oh, and XFX only requires a 300W PSU so you'll be good to go.