If you have a high end NVidia graphics card and you’re investigating data science with Keras+Tensorflow, then you obviously want Tensorflow to take advantage of your GPU (training times for deep neural networks can be 10 – 15 times faster even when compared to the latest CPUs).
Getting it all working can be tricky: I found this guide that explains the steps: Installing TensorFlow with GPU on Windows 10
Here’s another: How to run TensorFlow with GPU on Windows 10 in a Jupyter Notebook