I don't think a N64 is comparable to a Wii, the wii is underpowered as hell but it isn't that underpowered.
The N3DS (not the o3ds) might, might be able to run N64 games. Do not quote me on that, I don't know the lowest clock speed you need in order to emulate a N64 well (some phones do it quite well). I can't even imagine the o3ds doing n64 emulation considering it still has trouble with gba/snes games without dynarec.
Edit:
I noticed someone reference PSP n64 emulation. The PSP does have a higher clock speed than the N3ds (for whatever reason), but it isn't that comparable since it's a microprocessor(?) and the N3DS uses arm11. It's also multi-core, but I don't know if that makes a difference in emulation.