Scope: The TOP500 (www.top500.org) project ranks and details the 500 most powerful supercomputer systems in the world. The project was started in 1993 and publishes an updated list of the supercomputers twice a year.

This website is a good starting point for understanding the top supercomputers in the world

Scope: The DOE Summit Supercomputer from ORNL is the world's fastest supercomputer as listed in top500.org list as on Nov., 2018. This is one of the links that details the Summit architecture. The full details of the Summit supercomputer workshop are available here.