We need to get to the bottom of this! I've read reports of people not being able to get their 9700 Pro to work in a 8X mobo. This is just one post I've found: rage3d.com
As far as I know, we haven't found any issues with AGP8X chipsets. I don't have the whole test data with me but I know we tested a lot with VIA P4X400. No problem. We got a newer version of SiS648, no more crashes with this chipset. We also test KT400 but I don't have the test result.
Of course, that some flaw with the motherboard and/or BIOS may be contributing to this problem seems to have been overlooked.So my conclusion is that ATI needs to fix the issues before it gets out of hand. I mean come on saying the card will work with 8x AGP and then it doesnt on all boards is crap. Just my 2 cents.