There is always a constant and tough struggle for supremacy among the manufacturers of computer components like CPUs, graphics cards, system memory modules, coolers, etc. There is fierce competition in each price category, especially among top-end products. The graphics card market is a vivid example of that. Having the world's fastest graphics card under one’s belt is not only prestigious but also profitable because it proves the manufacturer's technical superiority and promotes its sales in other price sectors.Up to this moment the Nvidia GeForce GTX 580 has been the fastest single-GPU graphics card although AMD could offer its dual-processor Radeon HD 5970 as an alternative. On March 8, 2011, AMD released an even faster dual-GPU product, Radeon HD 6990. Nvidia hasn’t taken long to respond and has just rolled out its own dual-processor GeForce GTX 590. So, I will be testing these two new dual-GPU solutions in this review.