To increase the clock on more recent cards such as the nVIDIA range, you need to use the 3.x version of the detonators and enter the following information in the register for Windows9x-ME:
Windows Registry Editor Version 5.00
The speed of the AGP bus is also obtained through a divider controlled normally by a jumper on the board, whose positions are 1/1 and 2/3 (two-thirds) of the frequency speed of the motherboard. This way, if you modify the frequency of the motherboard to 75 Mhz, setting the jumper in the 1/1 position, you will increase the speed of the AGP bus by 9 Mhz (originally set at 66 Mhz).
1 What is overclocking?