"" Can I install a 266MHz front-side bus AMD Athlon™ processor in a motherboard that only supports a 200MHz front-side bus?
266MHz FSB AMD Athlon™ Processor Runs Slower on a 200MHz FSB Motherboard
An AMD Athlon™ processor that supports a 266MHz front-side bus (FSB) will work on a motherboard that only supports a 200MHz front-side bus, but the processor will operate at a lower frequency. This is a result of the processor's multiplier. The function of the multiplier is to multiply the bus frequency to derive the processor frequency. An FSB that is set to operate at 200MHz is operating at a frequency lower than expected for an AMD Athlon processor that supports a 266MHz FSB. Consequently, a 266MHz FSB processor will operate at a lower frequency if the FSB is only running at 200MHz.
For example, a 1000MHz AMD Athlon processor that supports a 266MHz FSB requires a 133MHz system clock (266MHz FSB) and a 7.5x multiplier. This results in a processor frequency of 1000MHz (system clock x multiplier = processor frequency). However, if the motherboard's FSB is set to 200MHz (100MHz system clock), the processor will only operate at 750MHz (100MHz clock x 7.5 multiplier = 750MHz CPU speed).""
So basically you could put a xp2600+ with a 266Mhz chip and multiplier set at 16. On a 200Mhz board this would give you a clock speed of 1.6Ghz. This also takes into account that your multiplier can go to 16.
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