AGP Pro refers only to a physical form factor. The Pro has a keyed connector so that Pro cards can not be inserted into standard slots but standard cards can be placed in a Pro slot. The big difference is that Pro cards draw more power and the Pro connector is supposed to be able to deliver it. There are actually two levels of AGP Pro power specs : Pro50 and Pro110. The signalling and throughput of AGP Pro is the same as AGP 4X.
I found an Mobo with a pro slot today (an Asus one, can't remember the number, was an i820 chip though), the Pro slot is longer than old AGP, starting where the old one starts, and going on to almost the end of the PCI slots. Looks to me like you could get a standard AGP card in there, but as Gomez said there aint no way you'll ever get a Pro card in a Standard slot.
My train of thought is a runaway!!
no i have a k7v as well. the reason i asked when "these" AGP cards would be coming out was so i could time my purchase of my next card. right now i have a CL TNTUltra on it. but would like to get a newwer card in a few months.
perva. will look into that card..sounds interesting w/64mb DDR