Is there a developer program that gets you early access to a head set ?
When they switched from PowerPC to x86 in 2005, the dev kit was a Pentium 4 motherboard in a Power Mac G5 case:
https://en.wikipedia.org/wiki/Developer_Transition_Kit
Apple never used any Pentium CPUs in Macs except for this loaner model. The first Intel Mac desktop was an iMac, so completely different form factor.