Single Processor PowerMacs

Spymac suggests that an all-dual Pro Line is not necessarily here to stay:

If recent rumors are to be believed, the next Power Mac revision -- still many months away -- will reintroduce the familiar mixture of single and paired-up processors we've become accustomed to.

Dual Processor machines help make up for apparent MHz number differences between current PPC and x86 chips, but increase costs in individual machines.