The GPU step is requiring large amounts of CPU VMEM

I can run the CPU step using modest amounts of resource - 16 core, 12G per core.  But the GPU step requires 400G of VMEM.  I am using a Nvidia A100 with 80G of GPU memory - and  it is being used according to 'nvidia-smi'.   The protein I am folding is very short - 197 amino acids.  Is this normal?  I would have hoped the GPU step would require much less CPU RAM.