How to install TensorFlow-gpu with cuda8.0?

You'll need to install the version 1.4.1 for CUDA-8 as

pip install tensorflow-gpu==1.4.1

The latest (version 1.5) is for CUDA-9

I was facing the similar issue, until I found

https://www.tensorflow.org/install/install_sources#tested_source_configurations

check your installed cuda version and cudnn version and then find out which version of tensorflow-gpu is compatible with those using link mentioned above.

I had installed cuda 8 and cudnn v5.1, hence by checking above link tensorflow-gpu 1.2.0 was compatible and after installing that using

pip install tensorflow-gpu==1.2.0

It worked for me.