The command .speed shows the speed for both processors and busses attached to the system, as follows:
ok .speed CPU Speed : 248.00MHz UPA Speed : 082.66MHz PCI Bus A at UPA node 1f: 66Mhz PCI Bus B at UPA node 1f: 33Mhz PCI Bus A at UPA node 6: 66Mhz PCI Bus B at UPA node 6: 33Mhz PCI Bus A at UPA node 4: 66Mhz PCI Bus B at UPA node 4: 33Mhz