HPC SDK with CUDA support

I am new to HPC SDK and CUDA, In the SDK release note, here is
" An NVIDIA CUDA GPU device driver must be installed on a system with a GPU before you can run a program compiled for the GPU on that system. The NVIDIA HPC SDK does not contain CUDA Drivers. You must download and install the appropriate CUDA Driver from NVIDIA , including the CUDA Compatibility Platform if that is required."

Dose it mean I should fully install CUDA by CUDA toolkit, or just install NVIDIA GPU card driver that can make the SDK for use?