clbitcrack behaves weird on old and low gig cards .. best case scenario is it's gonna search but not find anything when testing a known key in a known range (i.e fail test)
Here is test results:
Rx 5xxx XT - work and pass test
Rx 570 8G - search but fail test
Rx 580 8G - search but fail test
Anything less - do not search
In the NVIDIA family i found anything less than 1xxx 8G to not work or behave weirdly ( yes you can use your NVIDIA card with clbitcrack .. in my case cuda has a config problem that im not so fond of spending time on fixing right now)
Your results may vary.