While checking a new environment, a developer runs nvidia-smi and reads a CUDA Version of 12.4 in the top-right header. They want to know what this particular number tells them about the system. Which interpretation is correct?
- AIt is the highest CUDA runtime version the installed driver can support, not necessarily the toolkit version installed on the system. Correct
- BIt is the version of cuDF currently installed, which determines which RAPIDS APIs are available in the environment.
- CIt is the exact version of the CUDA toolkit installed for compilation, which nvcc would report identically on this machine.
- DIt is the compute capability of the physical GPU, which fixes the set of CUDA features the hardware can execute.
Why A is correct: The nvidia-smi header reports the maximum CUDA runtime API version the current driver is capable of supporting, so a separately installed toolkit may be the same or older, which is the precise meaning of that field.
Why B is wrong: This is tempting because RAPIDS versions track CUDA closely, but the nvidia-smi header reports nothing about cuDF or any Python package. Installed RAPIDS versions are shown by pip or conda, not by nvidia-smi.
Why C is wrong: This is a frequent confusion: the header shows the maximum CUDA runtime the driver supports, not the installed toolkit. nvcc reports the toolkit version, which can differ from and be older than the driver figure.
Why D is wrong: This is plausible because compute capability is a real GPU property, but it is expressed as a separate value such as 8.0 or 9.0 and is not what the CUDA Version header shows. The header is a driver-support figure.