The only model 6741 that shows up in a websearch uses a K8M chip, not a K8T, but it uses an AGP slot (multiplier is not mentioned; could be 4x or 8x, but doesn't greatly matter).
AGP is vastly superior to PCI graphics. However, I suspect that you may in fact be referring to PCX (PCI Express). This has started to supersede AGP and is very different to the old PCI standard. Not many graphics cards ever used PCI as AGP came along when 3D cards became common.