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post #741 of 3800
That's not C states, that's speedstep...at least with Asus that's what drops the multiplier at idle. C states drop the voltage at idle.
post #742 of 3800
Quote:
Originally Posted by HardwareDecoder View Post

So i've been reading about the c-states and did my own test here is what I got.....
OFF.....
338
ON......
338
looks to me like c-states on/auto actually hurts performance on my machine/ssd
Comments anyone ???

Is that second shot with C states ON or on AUTO?
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post #743 of 3800
Interesting results.

I found a Toms article from 2009, they had run into issues with power savings features slowing SSD performance as well. Their conclusion:
Quote:
However, our findings are significant, as they can affect users who may not even know they are running an SSD with the brakes on. In short: really fast SSDs that can deliver 200 MB/s or even more of throughput become limited by CPU performance due to power saving mechanisms—or more precisely, they are bottlenecked by a limited availability of CPU time. This became obvious by switching the various power saving options on and off. We found that the sophisticated power saving mechanisms—such as the Active State Power Management for PCI Express, or the deeper C states that switch off entire functional units within the CPU at a transistor level—have a noticeable impact on the performance of our X25-E flash SSD. Obviously, the latency added by utilizing the more complex power saving features is significant enough to have to wait for the system to pick up data.

here is graphs from toms testing:
http://www.tomshardware.com/reviews/ssd-hdd-power,2170-4.html
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post #744 of 3800
Quote:
Originally Posted by Nihilo View Post

That's not C states, that's speedstep...at least with Asus that's what drops the multiplier at idle. C states drop the voltage at idle.

i didn't turn speed step back on, it was off for both tests and has been off since I oc'ed this chip.... when ever I have the cstates enabled c3/c6/c1e and "cstate package support" set to auto it does that where it takes me to lowest multiplier.


the options for the individual c states in my bios are either ENABLED or DISABLED and the package c state support is either AUTO, C2, C6, DISABLED
Edited by HardwareDecoder - 5/24/12 at 1:38pm
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post #745 of 3800
Quote:
Originally Posted by Nihilo View Post

That's not C states, that's speedstep...at least with Asus that's what drops the multiplier at idle. C states drop the voltage at idle.

actually it's c1e that drops the multiplier to 16x... speedstep varies the multi depending on the load similar to how c3/c6 varies the volts
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post #746 of 3800
Quote:
Originally Posted by iSeries View Post

I have tested this over and over:
4k-64thrd reads
C states disabled - 130mb/s
C states enabled - 230mb/s
C states on auto - 270mb/s
It says plain as day in the Asus manual that they do not recommend changing C3 and C6 from their default state of Auto as setting it to anything else can (and clearly does) affect Sata3 performance.

And they are wrong to say that. Download a program called Cstates 1.2 (for example) and monitor the C states, that shows you clearly what your computer is doing when you have them on AUTO etc.

Now that said, looking at your screenshots .. it shows something interesting as your score drops down to ~130MB/s which is exactly the problem some people are experiencing with their M4.

http://forum.crucial.com/t5/Solid-State-Drives-SSD/low-4K-64Thrd-with-AS-SSD/td-p/84448

Not knowing more and being totally off topic here, I'm thinking you have this problem and the apparent fix is to enable C states!? If you can repeat it each time, can I suggest (if you haven't already) you post there and ask others who have the problem to try it out.
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post #747 of 3800
Quote:
Originally Posted by Iketh View Post

actually it's c1e that drops the multiplier to 16x... speedstep varies the multi depending on the load similar to how c3/c6 varies the volts

Ahh gotcha. Well here's my load on one core prime

292

It went 1.24, 1.248, 1.256..between all three of those is where it bounced around.
post #748 of 3800
Quote:
Originally Posted by Iketh View Post

Quote:
Originally Posted by Nihilo View Post

That's not C states, that's speedstep...at least with Asus that's what drops the multiplier at idle. C states drop the voltage at idle.

actually it's c1e that drops the multiplier to 16x... speedstep varies the multi depending on the load similar to how c3/c6 varies the volts

+Rep. I could never figure this out. tongue.gif
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post #749 of 3800
Disregard anything from Tom's Hardware..If It's not from OCN,[H],or Anandtech..It's most likely false info.
Anyone get a golden 3570K yet? I thought not..I knew about this..It makes me sad sad-smiley-002.gif
Maybe I can figure out when they have to make moar..and they may make the newer ones better! :thumb.gif:
 
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post #750 of 3800
Quote:
Originally Posted by Nihilo View Post

It went 1.24, 1.248, 1.256..between all three of those is where it bounced around.

So you've confirmed c3/c6 is disabled. Are you gonna try enabled? biggrin.gif
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