Hpet should always be enabled anyway in any bios of the motherboard.
It sets the motherboard to high performance mode, for video decoding, and encoding and multimedia programs to do with sound and vdeo keeping both in sync.
sorry mother is z97a usb 3.1 and i want disable because i am found a solution for mouse lag and geforce drivers and one of step i see in geforce forum talk about disable hpet in bios and w7, On the other hand i have a OC cpu at 4.5 ghz and maybe hpet is not necessary so if option is not in bios how i disable it?