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Intel C-States OFF - Better SSD Performance ! - Page 3

post #21 of 28
Quote:
Originally Posted by DuckieHo View Post

I can't see how disabling C-States would increase SSD performance.... and how no one else has noticed.
This is especially true in enterprise systems running SSDs.... C-states can save significant amounts of power.

I have no idea why either BUT the screenshots i provided does seem to show it.
The boost you get is mostly in the 4K read/write tests and its only minimal.

Dont notice any difference in reall life performance at all tbh, but the numbers do show the truth.
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post #22 of 28
Quote:
Originally Posted by mxthunder View Post

C states are for tree huggers. The proc is not downclocking/volting when C states are disabled. that is why you are getting higher temps. not really a big deal, those are still OK idle temps.

lachen.gif
post #23 of 28
Quote:
Originally Posted by DuckieHo View Post

I can't see how disabling C-States would increase SSD performance.... and how no one else has noticed.
This is especially true in enterprise systems running SSDs.... C-states can save significant amounts of power.

still interesting tho,
if i compare mine and Farih's, the biggest difference is in the 4K read/write..
but i love my C-states savings, so ill leave them like they are now,
i dont think ill notice that much difference with my SSD in daily usage
Edited by VonDutch - 12/3/12 at 7:18am
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post #24 of 28
Quote:
Originally Posted by Farih View Post

I have no idea why either BUT the screenshots i provided does seem to show it.
The boost you get is mostly in the 4K read/write tests and its only minimal.
Dont notice any difference in reall life performance at all tbh, but the numbers do show the truth.

But like you said... it's well within the margin of error. It's like a 3% difference?
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post #25 of 28
Quote:
Originally Posted by DuckieHo View Post

But like you said... it's well within the margin of error. It's like a 3% difference?

Yeah, though the screenshot without C-state's is a bit higher, could still be margin of error but VonDutch gets the same.
Still only 2 people with these results though and even if they mean something you wont notice it in daily usage at all.


Maybe it only helps on Dutch machine's lachen.gif
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post #26 of 28
Thread Starter 
This is my ATTO ( i use ATTO because benches more better than AS SSS, my drive has sandforce controller, so ATTO is the best for me).
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post #27 of 28
It was bought to my attention a few months ago regarding the SSD performance drop when enabling C states.

http://www.overclock.net/t/1120291/solving-fixing-bsod-124-on-sandybridge-read-op-first

Scroll down a little. smile.gif

http://www.overclock.net/t/1120291/solving-fixing-bsod-124-on-sandybridge-read-op-first/190 (Read on from here)
Edited by munaim1 - 12/3/12 at 8:19am
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post #28 of 28
Micron did benching marking here with different BIOS configs: http://www.micron.com/~/media/Documents/Products/White%20Paper/pcie_ssd_performance_hi.pdf

They confirm that C-State does change performance. However, it looks like you just have to set just ONE of the following settings to get better performance. This is odd because some of these settings are unrelated but all yield about the same performance gains. (i.e. If Spread Spectrum is enabled, enabling C-State does not improve performance.)


C1E Support = Disabled
Clock Spread Spectrum = Enabled
CPU Ratio = Manual
Intel C-STATE = Disabled
Intel EIST = Disabled
Intel VT =Disabled
QPI Frequency = 6.4 GT/s
Throttling = Disabled
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