sorry sorry, i did a mistake, this is actually PCI-E , as its name is, PCI-Express, so X was embeded in my mind.
yes, of course, its 16X (now as Black slot for AGP cards) and PCI-E normal for other cards.
hmm, well, motherboard with these are still in test, but the new chipset from intel, the 915 and 925 is made of that, and you can find Asus' new motherboards P5AD2 and P5GD2 on that.
again sorry for a littel confustion, make one self clear again.