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Performance Loss With EIST And C1E On?

post #1 of 17
Thread Starter 
Hi guys, I can stabilize at 4.8GHz if I turn Speed Step and C1E on, because my idle VCore is what has been getting me (and this allows me to idle at 1.6GHz). So my question is, will I notice any performance loss with these on? I am thinking in situations where the CPU is switching from 1.6GHz to 4.8, will that cause sluggishness?
    
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post #2 of 17
Nope.
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post #3 of 17
No, there's no performance loss. The only real reason to disable C3/C6 states is if you're all out of options and you're BSOD'ing because of idle issues. Do not disable EIST/C1E.

And the CPU ramps up to your core clock when it is put under load, so if you're idle it will sit at 1.6Ghz, it won't rapidly fluctuate.
post #4 of 17
Thread Starter 
Quote:
Originally Posted by E-Peen;13884751 
No, there's no performance loss. The only real reason to disable C3/C6 states is if you're all out of options and you're BSOD'ing because of idle issues. Do not disable EIST/C1E.

And the CPU ramps up to your core clock when it is put under load, so if you're idle it will sit at 1.6Ghz, it won't rapidly fluctuate.

I am having idle issues. My GD65 has about a 0.05v Vrise, so it can't set it at the VCore it needs for idle, or else the load voltage will spike way too high, I am already at 1.456 Folding, is that ok?
    
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post #5 of 17
For 24/7 use 1.456v is alright, you won't have to worry about degradation quickly at that VCC.
post #6 of 17
Quote:
Originally Posted by snelan;13884051 
Hi guys, I can stabilize at 4.8GHz if I turn Speed Step and C1E on, because my idle VCore is what has been getting me (and this allows me to idle at 1.6GHz). So my question is, will I notice any performance loss with these on? I am thinking in situations where the CPU is switching from 1.6GHz to 4.8, will that cause sluggishness?

In my case with these options on my cpu performance is going down when i play games,but in your case I don't know,I recommend turning those options off.
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post #7 of 17
The switching happens in microseconds. I know it looks like it may take a while to switch when you view CPU-z, but the actual switching is happening at a ridiculous rate.

I always OC with the power savings on. You are just burning power for no good reason when you disable them. Back in the day you had to disable them for stability, but not so much anymore.
Edited by corky dorkelson - 6/15/11 at 1:48pm
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post #8 of 17
Quote:
Originally Posted by fonzye;13884892 
In my case with these options on my cpu performance is going down when i play games,but in your case I don't know,I recommend turning those options off.

It's actually not recommended, because there's no real-world performance difference from enabling and disabling Speedstep. There's an idle issue with the 2600k chips, and disabling C3/C6 states for some have fixed that issue. However, disabling C1/EIST is not recommended, and not optimal. The only difference is rather than your core idling at 1.6Ghz to save energy and reduce heat, it's idling at 4.8Ghz which is ridiculous because you're wasting energy and causing unnecessary heat when you're just doing nothing but browsing the internet.
Quote:
Originally Posted by corky dorkelson;13884906 
The switching happens in microseconds. I know it looks like it may take a while to switch when you view CPU-z, but the actual switching is happening at a ridiculous rate.

I always OC with the power savings on. You are just burning power for no good reason when you disable them. Back in the day you had to disable them for stability, but not so much anymore.

thumb.gif
post #9 of 17
Thread Starter 
Ok, so no performance loss.

@ E-peen, what do you mean by "quickly". I plan on getting SB extreme, but I still want this 2600k to last for years to come. It folds at around 58c and Prime95 brings it to 63c at most.
Edited by snelan - 6/15/11 at 2:00pm
    
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post #10 of 17
It won't cause any sluggishness and like c dorkelson said, it shouldn't affect stability tho I did get a 124 bsod (stable OC) when I had these enabled a couple of days ago. Disabled them and now its all fine.
I like full speed anyways ...
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