Problem with MI300x is the price. Problem with 7900XTX is that it's at best as good as Nvidia with the same RAM for a similar price. If 7900XTX had e.g. 64GB of RAM, was 2x slower than 4080, and kept its price, it would sell like crazy.
I have a 7900 XTX. Honestly I regret it. It took two years for the driver to stop randomly crashing with very pedestrian ROCm loads. And there's no future in AMD support now they're getting out of the high-end dual-use GPU game anyways. I should have gone with NVidia.
For local inference, 7900 XTX has 24 GB of VRAM for less than $1000.
At what threshold of VRAM would you start being interested in MI?