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2scoops0406
It's likely that the installer is identifying the processor from its internal id, rather than the speed it's been ramped up to.
I am sort of guessing here, but I think the installer may be getting the CPU speed from the registry. There is no direct way AFAIK to query the CPU for it's clock speed, you have (or had) to work it out from some slightly cunning code.
YOU PROBABLY DONT WANT TO TRY THIS but if you go into
start->run type regedt32 click OK
navigate to HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0
In here you'll see a value that says ~MHz you could if you're feeling really brave, set this value to 0xBB8
but YOU PROBABLY DON'T WANT TO DO THIS, IT MIGHT BE THE END OF YOUR MACHINE.
Warning over