Need help deciding which graphics card will do.

[HeyAlucard]

hello to whomever reads this
I've looked around and I haven't really got a straight answer. I recently got a new computer and I was wondering which graphics card will max out dolphin.
I've read that a 750 ti will do even a 760. Does anyone have these cards with results any help/suggestions will do. [:

I currently have an i7 4790k (not sure if this info is needed)