Video Card
There is no latest AGP bus. The most recent bus designed for high performance equipment is PCI-E. And x16 has the highest bandwidth.
AGP
AGP (Advanced Graphics Port) Is a special card socket designed specifically for video cards. Video cards used to sit on the PCI bus with all the rest of your hardware. It was eventually decided that performance could be improved by putting video cards on their own specific bus. The AGP bus has special priority when the CPU is processing stuff, and usually runs at a much higher clockspeed than the PCI bus.
Accelerated Graphics Port (AGP)
A graphic card in an AGP (Accelerated Graphics Port) bus is a dedicated hardware component designed to enhance graphical performance in computers, specifically for rendering images and video. The AGP interface, introduced in the late 1990s, allows faster communication between the graphics card and the motherboard compared to the older PCI standard, enabling higher data transfer rates for better graphics rendering. AGP cards were widely used in gaming and graphic-intensive applications before being largely replaced by PCI Express (PCIe) technology.
32 bit
PCI Express
PCI-E
The IDE drive has no direct correlation to the AGP bus.
The PCI Express x16 is intended to ultimately replace the AGP bus along with the PCI-X and the Conventional PCI.
PCI Express 2.0 x 16 is the Fastest But PCI Express x16 is faster than AGP
AGP is an older video card specification that had a higher bus speed than the PCI spec.