Specifications for AGP 8x from Intel
Intel has published a draft for the future AGP 8X specifications in revision 0.9. AGP 8X will therefore have a maximum transfer rate of 2.1 GByte/s, which is twice that of the current AGP 4X.
Furthermore, mainboards and graphics cards can be built in such a way that they are backwards compatible with AGP 1X, 2X and 4X. The clock frequency remains 66 MHz even in the AGP 8X mode. The graphics card transmits a total of 32 bytes of data in a 15 nanosecond clock interval. The signal voltage on the data lines is only 0.8 volts in 8X mode, as opposed to 1.5 volts for AGP 4X and 3.3 volts for AGP 1/2X. Graphics cards can continue to consume 40 watts. If the graphics card consumes more than 40 watts, it still needs an AGP-Pro slot that delivers up to 110 watts, as it has additional power supply pins. With AGP 8X it will also be possible for the first time to pack several AGP slots on one mainboard. Further innovations for workstations are in preparation.