Looking to upgrade my PSU

Hey, I'm currently running a 650w PSU, but am looking to upgrade my 2060 super to a 5070ti.
I have a 10700kf, and 6 fans not including the CPU cooler

Nvidia says minimum PSU is a 750w, and Asus says recommended 850w for the 5070 ti.

a friend of mine has a brand new Corsair RM750E they were going to give me for $80 CAD

Will this be fine for my rig? or should I go for an 850w?