In fairness the OP was only asking for recommendations around a 5070TI not troubleshooting advice for the current card.
The thread did turn into a troubleshooting thread though, I suspect in part because people here are helpful and partly because of the whole moving to Nvidia thing (I wonder if the reaction would've been the same if he was looking to move from a 5070Ti to a 9070XT?)
That is very weird take IMHO. I don't think anybody would suggest moving from an RTX5070TI to an RX9070XT as it wouldn't yield any performance improvements,unless it's something very niche.
The following applies to all card brands:
1.)You do realise the RX9070XT consumes upto 150W under average load more than their RTX2070? The RTX5070TI consumes less, but still 80W to 100W more than an RTX2070.
2.)Peak power consumption of both cards,ie,transient spikes will be even higher. I estimate between 150W to 200W above an RTX2070.
3.)Even if a PSU has the required power,if it is an older design it might not support some of the newer ATX standards,or respond well to transient spikes. There is also the possibility of the PSU being faulty.
4.)It is also well known that newer graphics cards might need the latest BIOS for compatability issues. Then there is situation if ReBAR/SAM has been activated or not and some games require it.
5.)Moving from Nvidia to AMD and AMD to Nvidia,requires you properly uninstall all the drivers,etc. If you don't do that it can cause issues.
6.)If you have an unstable CPU or RAM overclock,it can be exposed by a faster card,because the higher FPS will push the CPU and RAM more.
7.)Always worth doing a virus scan can in case of crypto-mining malware. It's happened before on here!
I have had the latter issue,ie,RAM overclock being not as stable as I thought being exposed by a faster card. Once I had redid the settings and tested it longer I was fine.
In the end too many on this forum just instead of doing proper troubleshooting just throw money at issues.