The previous table shows that there are combinations of motherboards and video cards which can be plugged together but do not work. According to the AGP specifications there should be no damage, but the combination would not be compatible. You see people posting in forums worrying about this possibility all the time. There are also stories that you can get some 0.8 volt only cards which are willing to tolerate 1.5 volts but that you really shouldn't plug them into an AGP 4X motherboard even if they work. Given the previous table, the confusion is understandable. But there are two pieces of information which they're missing: nobody makes AGP 3.0 cards, and nobody makes AGP 3.0 motherboards. At least not any manufacturers I can find. Every single video card I could find which claimed to be an AGP 3.0 card was actually a universal 1.5V AGP 3.0 card. And every motherboard which claimed to be an AGP 3.0 motherboard turned out to be a universal 1.5V AGP 3.0 motherboard. It makes sense, if your think about it, because if anyone actually shipped a consumer-oriented product which supported only 0.8 volts, they would end up with lots of confused customers and a support nightmare. In the consumer market, you'd have to be crazy to ship a 0.8 volt only product. And as far as I can tell, there aren't any in the workstation market either. There may be some obscure product somewhere, but I sure can't find any. It's easy to find ones which are mislabeled as AGP 3.0 cards or motherboards but I haven't been able to find the actual item.
...That's why "If an AGP card fits in an AGP slot then they are compatible" is actually correct if you only consider stuff you can really buy.
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