Originally Posted by kingcrabmeat
It sounds like you are trying to achieve greater power efficiency while manually setting the CPU voltage. With the conclusions you have drawn from stress testing and the wonderful ASUS overclock documentation on this site, you should be able to make the switch to offset mode easily. That will allow your CPU to throttle according to load. It also happens to be a lot of fun, however challenging, to do.
I can't say for certain that this will help you in your situation but perhaps you could try disabling the C3 and C6 power saving features. It may only affect throttling in offset mode, which I am using, but I found that it had a major impact on my system's stability. The C3/C6 features are said to yield minimal benefit to power savings overall.
Edit: I did some reading and found that, when using manual voltage and power states enabled, the CPU will throttle according to load. I still think that a properly configured offset would have a minor advantage, at least, over manual mode and most certainly outperform adaptive. Pardon my lack of knowledge as I have only worked with Ivy.
Indeed, Haswell is a bit different/wierd. I actually use manual voltage and disable Intel Speedstep entirely, but I also enable the C7s state, so the core can still drop all the way to 0.0v at idle.
I haven't noticed any performance/stability penalty with any power-saving state, though disabling Speedstep smooths out a few games.
Originally Posted by NirHahs
well, using offset or adaptive mode could increase the voltage while doing prime or AIDA. that is very dangerous. i prefer manual mode. arent the C3 and C6 feture is to make the Core speed constant? I mean no drop when idle
Haswell cores have a bad habit of overvolting themself with AVX2 workloads. IMHO it's given Haswell a bad reputation.
C states seem to be separate from the actual clockspeed and only matter at idle, Speedstep is what controls speed/voltage.Edited by brucethemoose - 4/10/14 at 12:27pm