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When overclocking your CPU, you are increasing the system bus speed. The PCI bus runs at a different speed from the system bus, and its speed is typically proportional to the system bus speed. This proprtion is usually 1/2 the CPU speed up to 100mhz, and 1/3 the CPU speed above 100 MHz.

The internal clock rate of the CPU is some multiple of the system bus speed (e.g. a 400 Mhz Pentium II is a 100 Mhz system bus speed with a 4x multiplier, and the PCI bus speed is 1/3 the system speed, or 33 Mhz).

Here's a chart:

System Bus Speed	PCI Bus Speed
66 MHz	33 MHz
68 MHz	34 MHz
75 MHz	37.5 MHz
83 MHz	41.5 MHz
100 MHz	33 MHz
103 MHz	34 MHz
112 MHz	37 MHz
124 Mhz	41 Mhz
133 MHz	44 MHz (Abit allows 33 MHz, others might too)

These numbers are accurate for the Abit BX6 and BH6 motherboards. Others are probably similar.

So, with Pulsar, the only safe configurations, according to Creamware are the ones at which the PCI bus speed is 33mhz. So, you should stick to system bus speeds of 66mhz and 100mhz (and on the Abit BH6, 133mhz, but your CPU might burn up)