Question about my 3070

So I have a aorus master rtx 3070 on the way and a psu coming possibly a month after (completely broke after buying the gpu and have to wait a little to get funds), the psu that I have is a 550w psu (not sure about the rating) and an rx 6600 hooked up to it

I looked online and saw that it was fine to use the gpu with it but not recommended and others that says undervolting the gpu helps a lot (especially for the lifespan) My question is, what are the best msi afterburner settings to add to it? Or is every 3070 different? I’m pretty new to the pc world so I don’t know everything