An updated edition of the classic book on computer architecture by J. L. Hennessy and D. A. Patterson.\nAuthors show their high level standards for technological ideas, writing style, and teaching methodologies, all in one book. In fact, they maintain their quality since the first edition of this book. As authors explain, one of the main reasons for the fourth edition of the book is the focus on parallel architectures for high performance, more specifically: multiple processors or processors cores per chip designs.