Well, yes, in the sense that it won't run on an old 16-bit processor
But there's no need to limit yourself in the other direction. I have Haiku 32-bit and 64-bit installations running on the same quad-core P5. More or less anything built in the last fifteen years should do.
GPU drivers are a problem, but the Haiku VESA implementation is pretty good, actually. For sound, you may need to install the Opensound package.