Hey Rock, I hear you!! A person just up the road from my house is selling a 3070. I could just walk up there, buy it and have it up and running in my PC in less than an hour. It's taking all my will power not to do that and wait for a 3080/6800XT. Don't think you will need a PSU. If I was you I would try it first before buying. My PSU is only a 650 Watt one and I plan to use it for the 3080. And, because the 3080 cards are all pushed to their limits, no real overclocking headroom, you can undervolt the cards which will reduce power consumption and could also give you extra performance.