If your coming from Nvidia cards you might be scratching your head when I tell you the best results are usually when you undervolt the card. Less volts, less heat means boosting longer.Got to say I'm also very happy with my 7900xtx and glad I opted for it as it looks like it'll have me covered at 1440p UW for a while! Don't play many games with RT so doesn't bother me about it's lacking performance in that realm.
A good choice grabbing one these days and overclocking it a bit to get longer lasting performance if needed. My Sapphire Pulse should take a bit of OC'ing at some point if needed but I haven't done anything for now.
I'll post some tuning settings tomorrow.