My experience has been that the TF 1.x libraries don't support the GPU compute level of the new 3 series, but perform faster than the properly configured and compiled compute level on the 2.x TF platform. Tensorflow 1.x is definitely faster than Tensorflow 2.x at least for now.
Just got an offer to upgrade from 3080 to 3090, so did it. (Yeah, I needed the memory, so while the perf difference isn't significant,it's welcome).
2021-03-28 10:06:46.432643: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1406] Created TensorFlow device...
/mnt/c/python/Lib/site-packages/ai_benchmark/data/classification/7.jpg
Installed straight from pip including --upgrade flag. Test crashes on zero byte file. Temporarily copied 8.jpg to 7.jpg.