Thanks to ooo.
"Our sources with knowledge of the matter told me that NVIDIA had stopped producing the GeForce4 Ti4600 graphics processors at TSMC fabs and the company"s closest partners confirmed the information. Moreover, some retailers indicated the tight supply of the GeForce4 Ti4600 based products in the channel. A week ago we reported that NVIDIA cannot fulfil the demand on the GeForce4 Ti4600, Ti4200 and GeForce4 MX440 chips with AGP 4x support. Apparently, the Santa Clara, California-based fabless semiconductor developer started to produce the GeForce4 MX with AGP 8x support instead of the same GPUs but with AGP 4x. This caused temporary shortage of the graphics chips, but everything should be on track soon. The lack of the GeForce4 Titanim processors was caused by the shift of the GeForce4 Ti4200 to AGP 8x specifications and end-of-life (EOL) for the GeForce4 Ti4600 GPUs. "
An interesting idea- and a good management decision from Nvidia to a certain extend. In the coming years, they are going to pickup alot more competition to their cards than that of the last 3yrs, and with a ever lagging technology market, they cant afford to make blunders or waste money.