Asus Maximus Hero VIII Z170 with i7 6700k running at 800mhz all the time.

I hope someone can help me but I have been tearing my hair out trying to sort out this problem. Ever since I put this system together it has been throttling to its idle speed all the time and nothing including stress tests will budge it from 800mhz and an 8x multiplier.

I have tried all the power settings inside of windows. Several different bios revisions, clearing the cmos, reinstalling windows twice, stripping everything out of the system apart from the m2 boot drive and mouse and keyboard, disabling speedstep and some of the c states but still nothing works.

The only way I have managed to get it to run at full speed is to use throttlestop. It is not really ideal having to use a third party program to get it to run properly.

I sent it back to the retailer for testing and they said it was working properly for them which is annoying because as soon as I got it back it was still running at 800. They now want me to send it back again for further testing so I wanted to make sure I had exhausted everything I could try before doing that.

Any advice would be greatly appreciated.
6 answers Last reply
More about asus maximus hero viii z170 6700k running 800mhz time
  1. Do you have the latest BIOS? and/or have you reset the CMOS? What does CPU-Z show in the CPU tab for multiplier and speed?
  2. Tradesman1 said:
    Do you have the latest BIOS? and/or have you reset the CMOS? What does CPU-Z show in the CPU tab for multiplier and speed?


    Thanks for the reply. Yes, I have the latest bios (1701) at the moment and also tried resetting the CMOS. Both with by pressing the clear CMOS button and also taking the battery out for a few minutes.

    The CPU-Z tab says 100mhz and 8x multiplier. I have tried changing this to 40x in the bios but this doesn't work either.
  3. Core speed shows 100? or BUS speed? What does multiplier actually read?
  4. Tradesman1 said:
    Core speed shows 100? or BUS speed? What does multiplier actually read?


    Sorry, the core speed is always at 800mhz no matter whether it is idle or being stressed. Bus speed is 100 and it is an 8x multiplier.
  5. Yep, something is wrong, either bad mobo or bad CPU, if you know anyone with a Skylake build could try the CPU in their rig, or their CPU in yours to determine the problematic component
  6. Tradesman1 said:
    Yep, something is wrong, either bad mobo or bad CPU, if you know anyone with a Skylake build could try the CPU in their rig, or their CPU in yours to determine the problematic component


    That's what I am afraid of but unfortunately I don't know anyone with a skylake build that can help me. I think I am going to have to return it to the retailer for the second time and hope they actually diagnose the problem this time. Last time they said there was nothing wrong with it but as soon as I plugged it all back in it was running at 800mhz full time and extremely laggy. :(
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