A bit of guidance/insight please.

Been doing a little mining on 2080ti rig with Phoenix (5.5c) & latest Nvidia drivers (to date 461.72) - all working well.

Managed to get hold of a 3080, put into a very similar system as the 2080ti (X570, 5900x...) - trying the same script, receiving an error message;

Unable to enum CUDA GPUs: no CUDA-capable device is detected
No OpenCL platforms found
No avaiable GPUs for mining. Please check your drivers and/or hardware.

All 'seems' fine, am I missing something really obvious?

Thanks for any advice