Which expansion slot is best for high-end dedicated video cards?

Solution:

It is done Motherboard.

The motherboard includes most of the slots that we'll run into these days. It's a little unusual in that we don't often see motherboards which have both PCI-Express slots and an AGP slot. The best slot to use for video cards is the PCI-Express x16 slot. The next best is the AGP slot. The next best is a PCI-Express x1 slot but video cards which fit that slot are very hard to find as of late 2006. Some low-budget computers are sold with integrated video and have neither PCI-Express x16 slot or an AGP slot.