Overclocking the X99E-ITX/ac

Interesting about the C States seemingly disabled when the Cache ratio is manually (increased?) set. That would seem to be an automatic behind the scenes change done by the UEFI/BIOS code. I assume you have C States set to Enabled rather than Auto.

I've seen things like that happen with other settings, such as automatically changing the CPU cooler fan speed to Full On when the CPU ratio was increased. That was on a Z97 board, not your board. That change could be overridden by resetting the CPU Fan speed setting and would not change again. I imagine you checked the C State option settings when you noticed C States were not active.

Something else just struck me, how did you know that C States seemed to be disabled? Was that by monitoring the VCore in a monitoring utility? Meaning the VCore did not decrease at idle when C States should be active?

If that is the situation, the monitoring program you are using is displaying VIDs and not the true VCore. That is common with Haswell processors, are you aware of this? Most hardware monitoring programs cannot display the VCore of Haswell processors, since the VCore voltage is created by the internal Haswell VRMs.

HWiNFO64 can display the VCore of Haswell processors on many different boards. I don't have personal experience with X99 boards so don't know if it will show your boards VCore.

Haswell over clockers generally feel that over clocking the Cache speed provides little to no performance increase.

You may know some or all of this, just sayin'

bog_xdan wrote: Probably you need more voltage vcore 1.35v? . But the cooling might not be enough. I didn't not have this platform.

I have done a bit of simple overclocking with the X99E-ITX/ac but haven't gotten into it a lot yet.  I just wanted to make a thread for anyone else overclocking to share their experiences.