Are you talking about Intel Arc? I'm yet to see any ML relevant benchmarks on Intel Arc. If you are aware of any please let me know.
How do you know it's bad? Do you have benchmarks?
Just checked, used 3090s are going for $700-900 on eBay.
You can get the latest Linux pacakges for eg Ubuntu here: https://wiki.ubuntu.com/Kernel/MainlineBuilds - probably other distributions have similar easy ways since it's needed so often in bug reporting for users to tell if a hw support bug is in a distro specific kernel change or not.