The Z87-G55 features MSIs Military Class 4 components that support you while you are questing, racing, battling & shooting your way to the top. MSIs Military Class 4 components deliver record-breaking stability when you need to keep cool in the heat of battle. The standard in stability built on a proven technology of high quality components. SLI technology allows using multiple NVIDIA graphics cards in a single computer system with a motherboard equipped with an n Force SLI MCP. Users need a motherboard with two PCI-Express 16x graphics slots & two matching Ge Force graphics cards which are "SLI ready". AMD Cross Fire is the ultimate multi-GPU performance gaming platform. Enabling game-dominating power, AMD Cross Fire technology enables two or more discrete graphics processors to work together to improve graphics performance. AMD Cross Fire technology means that you can expand your systems graphics capabilities. It allows you the ability to scale your systems graphics horsepower as you need it, supporting up to four AMD Radeon HD graphics cards, making it the most scalable gaming platform ever. With an AMD Cross Fire gaming technology, the traditional graphics limitation exists no more, allowing you to enjoy higher performance as well as visual experience. Hear your enemies perfectly, even on an ear-drum shattering battlefield. Thanks to Sound Blaster Cinema, youre getting amazing surround sound with just stereo headphones. Your most important gaming sound effects are reproduced crystal clear allowing you to focus on your game even during extremely long gaming sessions. Powered by the SBX Pro Studio technologies, Sound Blaster Cinema enables you to clearly hear specific sounds in gaming environments, making your ears a decisive tool on the battlefield.