 The first models came with an Intel Core Duo Processor; in later models, this was replaced with an Intel Core 2 Duo.All models came with an hybrid graphics system, which features an integrated GMA 950 graphics and an Nvidia GeForce Go 7400 (later replaced with GeForce 8400M) graphics and were the first to be able to switch between the two with a reboot of the system.The chip-sets of SZ series have two basic modifications.