Reply 20 of 237, by swaaye
Fastest card you can put on an AGP 2x board is either GeForce FX 5950 or Radeon 9800. Newer cards require 1.5v signaling instead of 3.3v/1.5v. There are even some newer cards with wrongly keyed AGP connectors meaning you could fry something. I think I've seen some GeForce 6200s like that.
With the old AGP 2x Intel 440BX chipset, you can get most AGP cards to work fine as long as they are ok with 3.3v AGP 2x. There are some exceptions (GFFX 5600) but it is much less of a hair puller overall than Super 7.
Super 7 is just a nightmare when it comes to AGP. Even with cards from 1997-9. You really need to stick with cards that don't use much in the way of AGP features. That means a Voodoo 3, 4, or 5 basically. Anything else will most likely not be entirely stable. Some cards won't work at all (can't even install drivers). Other cards may work for an hour and then lock your system up. I'm sure that there are cards that work fine, but they are in the minority with those boards.
Frankly, even a K6-III+ @ 620 MHz won't max out a Voodoo5 so there's little if anything to be lost by not being able to run faster cards anyway. Hell a Voodoo3 is probably waiting on the K6-III+ most of the time.