Legacy Direct3D 7-class fixed-function T&L was now implemented as vertex shaders. It was very similar to its predecessor the main differences were higher core and memory clock rates, a revised memory controller (known as Lightspeed Memory Architecture II), updated pixel shaders with new instructions for Direct3D 8.0a support, an additional vertex shader (the vertex and pixel shaders were now known as nFinite FX Engine II), hardware anti-aliasing ( Accuview AA), and DVD playback. The GeForce4 Ti (NV25) was launched in February 2002 and was a revision of the GeForce 3 (NV20). In late 2002, there was an attempt to form a fourth family, also for the laptop market, the only member of it being the GeForce4 4200 Go (NV28M) which was derived from the Ti line. All three families were announced in early 2002 members within each family were differentiated by core and memory clock speeds. The MX family spawned a mostly identical GeForce4 Go (NV17M) family for the laptop market. There are two different GeForce4 families, the high-performance Ti family, and the budget MX family. The GeForce 4 series ( codenames below) refers to the fourth generation of GeForce-branded graphics processing units (GPUs) manufactured by Nvidia.
