Didn’t the computer geniuses at Virginia Tech put together a bunch of Apple computers to make a super computer?
Once the networking stuff got nice and cheap, even trivial, and dozens or hundreds of old peecees got replaced, and Linux came on strong, I remember reading about parallel processing across piles of linked machines, being done very cheaply at universities. Naturally, the processing power is much higher now.
But anyway, you’ve come to the right guy...
Speaking of Apple parallel processing:
http://members.aol.com/MJMahon/CratePaper.html