No matter how fast your CPU is and what graphics card you use, you are going to run short of performance sooner or later. Just start to play a movie in your media player, open a dozen websites in your browser, launch your favorite game in windowed mode, and your seemingly high-performance PC will surely indicate you need to upgrade.Although some of the blame lies with the programmers who fail to optimize their software, your CPU or GPU can also prove to be the limiting factor. Therefore both AMD and Nvidia have developed technologies for uniting multiple graphics cards into a single subsystem. This is a rather cheap way to increase your computer’s graphics performance. It also increases users’ brand loyalty as well as the service life of graphics cards despite the rapid changes in GPU generations. Let’s see what multi-GPU configurations are possible today.