The SZ series was the first to use switchable graphics – the motherboard contained an Intel GMCH (Graphics Memory Controller Hub) featuring its own in-built graphics controller (complete memory hub controller and graphics accelerator on the one die) and a separate NVIDIA graphics accelerator chipset directly interfaced with the GMCH. The GMCH could be used to reduce power consumption and extend battery life whereas the NVIDIA chipset would be used when greater graphics processing power was needed. A switch is used to toggle between the graphics options but required the user to preselect the mode to be used before the motherboard could initialize. The Z series has recently replaced the SZ series and does not require a restart of the system to change graphic modes on Windows Vista, which can be done "on the fly". This feature has subsequently been used by other manufacturers, including Apple, Asus and Alienware.