Companies other than Intel and AMd make X86 processors. I might add that you can get a 1Ghz X86 computer that runs at 10 watts, just like the 10 watts a 1.3 Ghz underclocked to 1 Ghz Motorola PPC will run at. I wishi I remembered the link, but I swear this is true, it was some article in a PC site about alternative processors to be cheaper.
Also, PPC to X86 is similiar to the CISC->RISC arguments, depending on what you want to do, you can make either just scream with speed.
