Hardware to focus on while buying a AI/Deep Machine Learning PC:
CPU: For data processing libraries such as Numpy, Pandas, Scipy and for plotting Matplotlib and Seaborn are used. To be able to make the data processing rapid-speed, a powerful CPU is much essential.
GPU: The GPU is just the heart of deep learning applications. Neural Networks like CNN uses libraries such as TensorFlow and PyTorch. In order to perform these tasks steadily, a performance GPU is required.
RAM: The larger the RAM the higher the amount of data it can handle, leading to faster processing. With more RAM you can use your machine to perform other tasks as the model trains.