the Alienware, Sager ( and other Clevo machines), MSI and Asus. Alienware is owned by Dell now and is distributed through mass market retailers like Best Buy and internet's Newegg. MSI and Asus have moved and received more exposure and available through mass market retailers but they have so many models and not all are3 gaming machines. Sager who uses Clevo products specializes in gaming machines. Prostar, Eurocomm (Canada) and Rock (Europe) are all Clevo machines with the same chasis but branded with their own names. They were the first to use SLI technology and 3 hard drive support with Raid 0 or 1. They offer the 2nd generatio Intel I7 extreme edition processor.