Power supply is overkill, 500W bronze should fine at about £40
I respectfully disagree, much better to have some headroom in the power for the sake of £30 or £40, an over specced PSU isn't going to draw more power than it needs but will draw that lower power more consistently.
Just checked and the power supply spec for a system with that card is 400W; it only draws 120W.
A 750W PSU isn't going to have any benefit over a 400W one of the same quality. You would just be buying almost double what you need.
@Sumo started
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Power supply is overkill, 500W bronze should fine at about £40