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post #11 of 14
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Quote:
Originally Posted by brucethemoose View Post

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.

EDIT:
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.

where can i get setting for speedstep in asus bios?
post #12 of 14
Quote:
Originally Posted by NirHahs View Post

Quote:
Originally Posted by brucethemoose View Post

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.

EDIT:
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.

where can i get setting for speedstep in asus bios?

I'm not on my rig now, but I'm pretty sure it's called speedstep, somewhere in the CPU or power settings where the C-state settings are. I'll look it up later.
Edited by brucethemoose - 4/10/14 at 4:59pm
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post #13 of 14
Quote:
Originally Posted by NirHahs View Post

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

From my observations with the Ivy architecture, a properly configured offset should increase the maximum voltage minimally which still seems preferable for standard use cases in which the CPU is close to idle most of the time. Offset mode allows voltage to drop significantly more than a manual voltage at idle, as I assume is similarly the case with Haswell.

If it is of any help, the best VCORE range I could get @4.5 GHz was 1.232-1.248 with a manual voltage configuration and 0.967-1.256 with a +.005 offset. Also, I had to keep an LLC of 75% (Very High setting) or fail to maintain stability. My temperatures might increase by a few degrees Celsius after running Prime95 for 7+ hours but I feel that they are lower on average. I suspect that the minor voltage increase is a direct result of having such a high LLC. Similar builds have no issues running at 25% (Medium setting), which I attribute to being a simple luck of the draw.

Maybe you do a lot of benchmarks and are trying to keep your temperatures down. Nonetheless, after succeeding with offset mode, I would recommend it to one who insists on getting the most out of their chip while extending its lifespan. It would be interesting to know if this is not the case with Haswell on an ASUS board. If I have any understanding, the returns might diminish slightly but still exist.
post #14 of 14
Quote:
Originally Posted by kingcrabmeat View Post

Quote:
Originally Posted by NirHahs View Post

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

From my observations with the Ivy architecture, a properly configured offset should increase the maximum voltage minimally which still seems preferable for standard use cases in which the CPU is close to idle most of the time. Offset mode allows voltage to drop significantly more than a manual voltage at idle, as I assume is similarly the case with Haswell.

If it is of any help, the best VCORE range I could get @4.5 GHz was 1.232-1.248 with a manual voltage configuration and 0.967-1.256 with a +.005 offset. Also, I had to keep an LLC of 75% (Very High setting) or fail to maintain stability. My temperatures might increase by a few degrees Celsius after running Prime95 for 7+ hours but I feel that they are lower on average. I suspect that the minor voltage increase is a direct result of having such a high LLC. Similar builds have no issues running at 25% (Medium setting), which I attribute to being a simple luck of the draw.

Maybe you do a lot of benchmarks and are trying to keep your temperatures down. Nonetheless, after succeeding with offset mode, I would recommend it to one who insists on getting the most out of their chip while extending its lifespan. It would be interesting to know if this is not the case with Haswell on an ASUS board. If I have any understanding, the returns might diminish slightly but still exist.

Haswell is a bit different. With AVX2 workloads (aka benchmarks, maybe encoding), the core automatically overvolts itself as much as 0.1v, which is a ton of voltage, relatively speaking. Ivy doesn't do this.

On the other hand, the architecture is optimized for power efficiency at idle. The uncore won't slow down when I disable speedstep, but even with manual voltage, the cores drop all the way to 0 volts at idle, running at nearly ambient temps. As long as you aren't pushing the uncore too hard, disabling speedstep/enabling C-States with Haswell isn't a big deal.

What you could do is run manual voltage for heavy benchmarks, and just use adaptive or offset for normal use.
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Bruce
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