That is one of the issues of Rhapsody for Intel based systems, it was designed to run on PCs of that day... that day being 1998. Unlike Macs of 1998, PCs (and PC components) from back then are a little hard to find.
Also, Rhapsody 5.1 has a RAM limit. It won't run on a system with more than around 192 MB of RAM without making some modifications to the OS. And even after the modification, it won't use more than 192 MB of RAM (though it'll at least run). Apple put this limitation in Rhapsody 5.1 to keep people from using it rather than the final release version (which for PCs was never released).
This is another reason why I tend to recommend Rhapsody 5.3 or later on PowerPC systems. On Macs, Rhapsody 5.3-5.5 can access up to 1 GB of RAM and Rhapsody 5.6 can access 1.5 GB.
While there is definitely the coolness factor of running a
Mac OS like OS on PCs, from a strictly productive stand point Rhapsody is better on Mac hardware.
The system requirements can be found
here (and the driver list for Rhapsody 5.1 for Intel can be found
here). I bought my IBM ThinkPad 760 ED because I knew it would run Rhapsody. I've never owned any PC that I couldn't run either NEXTSTEP, OPENSTEP or Rhapsody on. A PC that couldn't run those operating systems would have no value to me.
Here is what Rhapsody looks like on my ThinkPad. Displayed is the System Profiler and the Workspace Manager's about window.