N64 only supported up to 240p, or in rare cases, 480i, which is basically the same thing computationally. Displaying on higher resolution just involves scaling (or up-sampling, but at that kind of resolution jump scaling is probably more appropriate).
I haven't tested N64 games on a RPi personally, but I imagine it would have no trouble with it, and there seem to be several retro-gaming projects that involve N64 games and use the Rpi.
I haven't tested N64 games on a RPi personally, but I imagine it would have no trouble with it, and there seem to be several retro-gaming projects that involve N64 games and use the Rpi.