Is the clock speed stated on Wikipedia (G4) the theoretical max cycles the cpus can reach?

Because mine is listed as 500–867 MHz whereas if I do a cli c:cpu, I get the wonderful :

System: PowerMac3,1
Machine: 0x1
PageSize: 4096 Bytes
CPUCount: 1
CPU0: 7451 (G4) Version 32768 Revision 515
CPU0: CPUClock 1600000000 BusClock 99630669
CPU0: FPU Unit exists
CPU0: Altivec Unit exists
CPU0: Performance Monitor Unit exists
CPU0: DataStream Unit exists
CPU0: ReservationSize 32
CPU0: Ticks 4
CPU0: CacheL1Type 0x0
CPU0: CacheL1Flags 0x1000F
CPU0: ICacheL1Size 16384
CPU0: ICacheL1Lines 512
CPU0: ICacheL1LineSize 32
CPU0: DCacheL1Size 16384
CPU0: DCacheL1Lines 512
CPU0: DCacheL1LineSize 32
CPU0: CacheL2Type 0x0
CPU0: CacheL2Flags 0x1001D
CPU0: ICacheL2Size 524288
CPU0: ICacheL2Lines 0
CPU0: ICacheL2LineSize 0
CPU0: DCacheL2Size 524288
CPU0: DCacheL2Lines 0
CPU0: DCacheL2LineSize 0

^Which is basically double the clock compared to what wikipedia states.