What makes DGX systems the most different from bare-metal solutions is the software. All of them offer pre-installed and, above all, performance-tuned environments for machine learning (eg Caffe or Caffe 2, Theano, TensorFlow, Torch or MXNet) or an intuitive environment for data analytics (NVIDIA Digits). All of this is elegantly packed in Docker Containers. These constantly updated containers can be downloaded from the website NVIDIA GPU Cloud (NGC).
According to NVIDIA, such a tuned environment provides 30% higher performance for machine learning applications compared to applications deployed purely on NVIDIA hardware. However, the main advantage of a pre-installed environment is the speed of deployment, which can be fully operational in the order of hours.