Winstone and Winbench

CPU Benchmark
Winbench 99 CPUMark32
Celeron 550Mhz Socket-370	1240
Celeron 366Mhz Socket-370	910
Celeron 333Mhz Slot-1	832
Pentium II 500Mhz Slot-1	1180
Pentium II 400Mhz Slot-1	1000

The results from the CPUMark test show quite handily that the raw processor performance of both the Celeron and Pentium II chips lie in the MHz rating. From this test, there's no discernable difference between the P2 and the Celeron, regardless of cache size or speed.

Real-world Win98 Performance
Business Winstone 98
Celeron 550Mhz Socket-370	32.9
Celeron 366Mhz Socket-370	27.8
Celeron 333Mhz Slot-1	25.1
Pentium II 500Mhz Slot-1	31.2
Pentium II 400Mhz Slot-1	28.8
Business Winstone 99
Celeron 550Mhz Socket-370	22.7
Celeron 366Mhz Socket-370	18.7
Celeron 333Mhz Slot-1	16.9
Pentium II 500Mhz Slot-1	22.3
Pentium II 400Mhz Slot-1	19.0

The Business Winstone shows how competitive the Celeron 366 performs to the Pentium II 400, and how overclocked to 550, consistently beats out the Pentium II 500. The Business Winstone 99 test differs from the 98 in that it stresses actual multitasking in its procedure. Here, you would expect the Pentium II to pull ahead of the Celeron processors, as the L2 cache begins to play a more important role. However, it appears that the full-speed L2 cache of the Celeron (running at 366Mhz and 550Mhz, as compared to 200Mhz and 250Mhz for the Pentium II setups) makes up much of the difference for having only ¼ the amount as found on the PII's.