AGP 1x, using a 32-bit channel operating at 66 MHz resulting in a maximum data rate of 266 megabytes per second (MB/s), doubled from the 133 MB/s transfer rate of PCIbus 33 MHz / 32-bit; 3.3 V signaling.
AGP slots are superior to PCI for graphics cards because they provide a dedicated pathway between the slot and the processor, allowing for faster communication between the two.
In addition, AGP uses sideband addressing, meaning that addressing for packets is carried outside of the packet, meaning that the entire packet does not need to be read to get addressing information.
AGP 1.0 was introduced in 1996 and provided the 1X and 2X speeds which are two and four times as fast as a standard PCI slot.
The AGP signaling voltage is the voltage of the signal used to transfer data between the AGP card and the motherboard.
AGP adjustments made in the BIOS should be very reliable so if nothing else is working, then look around in the BIOS for an option which lets you set the maximum AGP speed or enable/disable fast writes.
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