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CPU multiplier switching back & forth 16x > 33x ?? - Page 2

post #11 of 26
Disabling C-states is easy but why would you want to do that...?
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post #12 of 26
Quote:
Originally Posted by Snowmen View Post

I don't see why you would want to disable it... It saves power and extends the life of the CPU. Even if the CPU if overclocked, it doesn't make it less stable or harder to reach higher clocks (I personally tested this).

I don't know about the 2500k but my 920 was not stabile at 4.0Ghz when speedstep was enabled so in my experience it can interfere with overclocking. IMO the best way is to disable all the power saving features when overclocking and then turning them on one by one afterwards.
    
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post #13 of 26
Quote:
Originally Posted by Bit_reaper View Post

I don't know about the 2500k but my 920 was not stabile at 4.0Ghz when speedstep was enabled so in my experience it can interfere with overclocking. IMO the best way is to disable all the power saving features when overclocking and then turning them on one by one afterwards.

i7 920 and 2500k overclock completely differently, leave the C-states on and let it save you some electricity. Some of the advanced states like C3/C6 might give you voltage issues, but C1E, EIST, etc. can all stay on.
post #14 of 26
Quote:
Originally Posted by Scorpion49 View Post

i7 920 and 2500k overclock completely differently, leave the C-states on and let it save you some electricity. Some of the advanced states like C3/C6 might give you voltage issues, but C1E, EIST, etc. can all stay on.

I know that OCing a 1366 CPU and a 1155 is very different. All I'm saying is that its good practice to OC with power saving features off as they can effect OC potential on some CPU's. After a stable OC has been achieved the can be turned back on. If the CPU is still stabile great.If not then you can either opt to leave them off or up the voltages some more and see if it helps.
    
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post #15 of 26
Quote:
Originally Posted by Bit_reaper View Post

I know that OCing a 1366 CPU and a 1155 is very different. All I'm saying is that its good practice to OC with power saving features off as they can effect OC potential on some CPU's. After a stable OC has been achieved the can be turned back on. If the CPU is still stabile great.If not then you can either opt to leave them off or up the voltages some more and see if it helps.

You've spent more time trying to shut off the best features of the CPU than it would have taken to plug in 45x multi and 1.300v, stress test, adjust voltage and go. Sandy Bridge is remarkably easy to OC unless you're going for cpu-z queen numbers, 4.8ghz+ takes a little work but again the only people who really OC with the power saving features off are sub-zero benchers. Also, you may experience more problems with things like C1E off than if you just leave it alone, some board absolutely will not run without certain states enabled.

I'm trying to save you some time and headache from experience, as I tried to do the same thing when I moved from the 980x to a 2500k back when they first came out.
post #16 of 26
Thread Starter 
Quote:
Originally Posted by Bit_reaper View Post

I don't know about the 2500k but my 920 was not stabile at 4.0Ghz when speedstep was enabled so in my experience it can interfere with overclocking. IMO the best way is to disable all the power saving features when overclocking and then turning them on one by one afterwards.
This is the way I learned how to overclock.

Turns out I still needed to disable "CPU Support C3 State", "CPU Support C6 State", and "Package C State Support"

That fixed everything!! biggrin.gif :biggrin.gif
Maybe it was only one of those settings that did it. Maybe they are useful features. I dunno. I will decide on that later. Just want a stable & working new build.

And to all you dude warring over whether it changes your performance, it seems that it does, slightly.
When I had those states enabled (and my multiplier was switching back and forth), I got a Cinebench score of 14.71 fps/5.24 pts
When I turned them off, the three Cinebench scores I got were 14.81, 15.13, 15.14 / 5.33, 5.38, 5.38

Obviously, my sample N isn't large enough. I will do more comparisons between the two, but first I am going to find my max clock with all those craps turned off. hxc.

drum.gif
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post #17 of 26
Quote:
Originally Posted by d3daiM View Post

This is the way I learned how to overclock.

Turns out I still needed to disable "CPU Support C3 State", "CPU Support C6 State", and "Package C State Support"

That fixed everything!! biggrin.gif :biggrin.gif
Maybe it was only one of those settings that did it. Maybe they are useful features. I dunno. I will decide on that later. Just want a stable & working new build.
And to all you dude warring over whether it changes your performance, it seems that it does, slightly.
When I had those states enabled (and my multiplier was switching back and forth), I got a Cinebench score of 14.71 fps/5.24 pts
When I turned them off, the three Cinebench scores I got were 14.81, 15.13, 15.14 / 5.33, 5.38, 5.38
Obviously, my sample N isn't large enough. I will do more comparisons between the two, but first I am going to find my max clock with all those craps turned off. hxc.
drum.gif

Yeah, C3/C6 are advanced states, C3 is sleep and C6 is core parking. They usually don't do anything good on a machine with either A) an SSD, or B) overclocking. C1E is the enhanced halt, which is fine to leave on as it is an instant on state and important for power saving. EIST should stay on all the time, as that allows you to overclock through turbo multiplier instead of base multi.

Also, don't try to push the BLCK much unless you are an extreme bencher, around 105mhz it gets iffy for SB causing errors.
post #18 of 26
Thread Starter 
Quote:
Originally Posted by Scorpion49 View Post

Yeah, C3/C6 are advanced states, C3 is sleep and C6 is core parking. They usually don't do anything good on a machine with either A) an SSD, or B) overclocking. C1E is the enhanced halt, which is fine to leave on as it is an instant on state and important for power saving. EIST should stay on all the time, as that allows you to overclock through turbo multiplier instead of base multi.
Also, don't try to push the BLCK much unless you are an extreme bencher, around 105mhz it gets iffy for SB causing errors.
Excellent advise bro
REP +++

Yeah, I'd go 102 or 103 on the BLCK max. Not anytime soon though haha.
For EIST, why is it better to use the Turbo multiplier instead of the Core multi? I don't plan on using TurboBoost. I'd rather OC fixed manually.
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post #19 of 26
Quote:
Originally Posted by d3daiM View Post

Excellent advise bro
REP +++
Yeah, I'd go 102 or 103 on the BLCK max. Not anytime soon though haha.
For EIST, why is it better to use the Turbo multiplier instead of the Core multi? I don't plan on using TurboBoost. I'd rather OC fixed manually.

Try it both ways, I've owned and overclocked over a dozen SB and IB CPU's now and I've only tried fixed speed once, it didn't make a lick of difference except to run my machine at 150+ watts 24/7 instead of like 35 at idle. For example, my current 3770k is running at 46x turbo multi, C1E enabled, EIST enabled, 102mhz BLCK. When its idle (which is actually rare because I fold on it) it consumes like 27 watts total for the whole machine since it downclocks to 1200mhz.

These newer chips with 2nd and 3rd generation turbo boost technology are way better at increasing speed and voltage without running into BSOD and crashes like the gen 1 chips did. I've never had any issue at all using it.

Anyways, let us know how your OC turns out, what speed are you shooting for? biggrin.gif
Edited by Scorpion49 - 10/12/12 at 9:14pm
post #20 of 26
Thread Starter 
Good info..! Then I'm sure I will decide to turn them on again once I've done all the testing I need to do to satisfy myself. lol

Mind you tell me how you are measuring the wattage that your machine is using? I want to do that tongue.gif
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