Wow, that's disappointing. From my brief research, it sounded like you didn't need too hot of a PC. I wonder if the program was camped a little to hard on the interrupt signals...
Please let us know what you find out. I was planning on putting a new machine on my desk, and putting my 800mhz box on the CNC, but now I might need to put the new box on the CNC.... or buy two.... What a disappointment.
Zeph