AGP Reference Voltage
Possible values of an option:
Depend on motherboard model, there can be a variant [Auto]
The option description:
Allows to set pressure of bus AGP manually. Necessity for its magnification often arises at bus AGP acceleration — regular pressure in 1.5 In (or 3.3 In for out-of-date specification AGP 1.0) any more does not provide stable operation of a video subsystem of the dispersed computer. If you are not engaged overclocking, «overvoltage» it is not required: leave value [Auto] or [1.5V] ([3.3V] for AGP 1.0).
Do not forget about sufficient cooling (additional case fans) at acceleration of components.
Other options identical to destination: