I'm not sure that any of those benches are really all that accurate. I mean, what exact card and other system specs were used?
There are generally quite a few different versions of cards with the same chipset... And then you have differences in memory, waitstates, etc.
Those charts only have one card of each type listed even though the different cards with the same chip may offer different performance levels.
I have an ET4000 card that has a "turbo" jumper on it. Enable that jumper and the speed of the card increases quite a bit.