Hi,
I bought the corsair SF750 with the Sapphire Nitro+ 6950XT
https://fr.pcpartpicker.com/list/sLCb78
On average "maximum" my setup is supposed to do not reach a higher wattage than 668W so my 750W PSU is enough.
However, we know that there are some spikes on GPUs, and according to this review...