cudnn does not support CUDA arch 2.1 cards. The minimum supported CUDA arch is 3.0
You can find out what CUDA arch your GPU belongs to in this page:

  
      
      NVIDIA Developer – 4 Jun 12
  
  
    

CUDA GPUs 369

Recommended GPU for Developers NVIDIA TITAN RTX NVIDIA TITAN RTX is built for data science, AI research, content creation and general GPU development. Built on the Turing architecture, it features 4608, 576 full-speed mixed precision Tensor Cores for...