I do have a motherboard that supports both 3v and 5v chips, but I'm not using that one. So if that were the case, I could've swapped out motherboards. But I like the one I have now because of the orientation of the ISA and VESA slots. I also like the aesthetics of my current board with the 30-pin SIMMs and the little individual cache chips that I put in. The other one has 72-pin RAM and the cache is soldered.
Edit: I did learn the hard way about 3v versus 5v. I used to have an AMD DX4 in the other motherboard, but when I switched over to my current board it's 5v only. So I burnt out my DX4. That's why I wanted the Overdrive.