What is difference between parameters "hpet=disable" and "nohpet" ?

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Issue

What is the Difference between parameters "hpet=disable" and "nohpet" passed to kernel line while booting?
Are these parameters architecture dependent ?
What is the significance of parameter "hpet" ?

Environment

Red Hat Enterprise Linux 32bit and X86_64 bit architecture
HPET Clock source

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