I've been unable to find a concrete answer for this so far.

I have a few Dual port ethernet cards, that are 64-bit PCI. However, I do not have (and have never seen <.<) 64-bit PCI slots.

According to http://www.daniweb.com/techtalkforums/thread14856.html , putting a 64-bit card into a 32-bit slot should be just fine; the card will just run in 32-bit compadibilty mode.

I'd just like to know if anyone else has done this before, and what they've experienced. (Problems, etc.)