Hello!
I worked with that couple of weeks ago, we had to train our model using Keras with theano backend and then we changed to tensorflow the Accuracy didnt really change nicely but it made it little faster than before, we used a Geforce 1070 with great graphics, added the necessary components from conda to use the gpu and everything worked.
My recommendations in order to give it a try is:
Use Anaconda:
Use python 3.5+
Thanks,
Hamza