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do you have intel c state disabled or enabled? - Page 11

post #101 of 135
Quote:
Originally Posted by GeneO View Post

Is this is Haswell? If so, auto may have the C6 and C7 disabled, Some MB manufacturers are playing it safe because some older power supplied can't handle the low power of these states.


nop, im on ivi's ... Core i5 3570K
post #102 of 135
do any one can help me ??

i have a GIGABYTE B75M-HD3 mobo, with a core i5 3570k, and 2x4GB Corsair Vengeance 1600Mhz, 9-9-9-24, i want to know if i can chance the memory latency to improve speed ...
post #103 of 135
so with no oc, i disable C6 and C7 ? and leave EIST be ? for more stability ??
post #104 of 135
Sorry for the slightly old bump, but I noticed none of these different tests mentioned if they were using Dynamic Storage Accelerator Enabled or not. Apparently with this enabled in the BIOS, this fixes the latency issues with SSDs when C-States are enabled. Can anyone confirm?
post #105 of 135
Quote:
Originally Posted by Wallboy View Post

Sorry for the slightly old bump, but I noticed none of these different tests mentioned if they were using Dynamic Storage Accelerator Enabled or not. Apparently with this enabled in the BIOS, this fixes the latency issues with SSDs when C-States are enabled. Can anyone confirm?

In manual mode, all it really does is allow you to enable or disable the c-states from the Intel RST control panel in windows, depending on the profile you select. I did not find auto useful at all - even though I had balanced power savings set, auto disabled all c-states at idle. Go ahead and play with it and monitor the C-states with something like realtemp. Basically lets you enable./disable c-states through windows, nothing dynamic about it as far as I can see.
post #106 of 135
The dynamic storage accelerator in the bios will improve but not eliminate the SSD latency induced by using C states, at least on my setup.

For example, on my crucial mx200 (after my 6 month old sandisk extreme pro bit the dust):

C states enabled, dynamic storage accelerator disabled in bios, then 4k random read in AS SSD = 26, overall score 1046.
C states enabled, dynamic storage accelerator Enabled in bios, then 4k random read in AS SSD = 30, overall score 1065.
C states disabled, which removes dsa from the bios (ie auto disabled and gone from view), then 4k= 33, overall score 1100.

So DSA helps with latency on my setup, but doesnt eliminate it. The same occurred with my sandisk extreme pro (rip).

But since I use manual vcore, all c states off, and high performance in windows, DSA is not applicable. But I would enable it on my laptop, where saving small amounts of power with c states makes sense to me.
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post #107 of 135
I have disabled C6 C7 state on my Haswell i5 because of stability issues when coming out of sleep or hibernation which is related to my PSU because I believe it doesn't support such low power state and Windows would almost always BSOD. Since I disabled it, no issues.
post #108 of 135
Quote:
Originally Posted by opt33 View Post

The dynamic storage accelerator in the bios will improve but not eliminate the SSD latency induced by using C states, at least on my setup.

Out of curiosity, have you checked the C states when you play around with DSA? The reason I ask is because when I was playing with it ages ago now, it itself changes the C states or rather what C states are allowed. If you have all C states enabled and flick it to power mode (whatever it is, forgot as I don't use it anymore) it removes disables C states. So I found it useless from that perspective.
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post #109 of 135
Quote:
Originally Posted by error-id10t View Post

Out of curiosity, have you checked the C states when you play around with DSA? The reason I ask is because when I was playing with it ages ago now, it itself changes the C states or rather what C states are allowed. If you have all C states enabled and flick it to power mode (whatever it is, forgot as I don't use it anymore) it removes disables C states. So I found it useless from that perspective.

Others have tested that is disables some of the deeper sleep states, never tested myself, but the mhz and vcore will still drop to low values with DSA enabled so some power savings are still clearly enabled. And it makes sense that it does just that, because C6/C7 enabled only doesnt induce much latency. It is the deeper states that cause the latency...which means it makes as much sense to just use the C states in the bios that dont cause latency, as it does to use DSA. But I dont play with them much, sense I wont every use any power savings on a desktop...other than sleep mode when Im not using it.
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post #110 of 135
I never had issues with disabling c-states with my 2500k and my 4930k but they're (c-states) driving me insane on my 5930k...

I need to disable C states or else I get freezing/lock-up with an annoying buzz/squeel in Battlefield 4. However, everything else is stable with C-States enabled, and I mean everything: Prime95, Wprime, HyperPi, ASUS Relbench tests and the stress, Aida benchmarks and stress, Passmark Performance Test, and same with my memory, plus HCI Memtest and the newest version of GoldMem...

Here is where it gets really weird: with C-States disabled, I seem to get very low single-threaded performance. For example:

ASUS RealBench v2.41 Image Editing
C-States On: 65 sec
C-States Off: 85 sec

Passmark Performance Test, CPU Single threaded Test:

C-States On: 17,300
C-States Off: 16,300

Cinebench OpenGL:
C-States On: 190
C-States Off: 88

Cinebench CPU (Single Core)
C-States On: 175
C-States Off: 123

Cinebench MP Ratio
C-States On: 7.6
C-States Off: 10.6


NOTE: High performance mode in Windows is always selected with min processor speed at 100%. HWmonitor always reports the cores at 4.5GHz so nothing seems to be downclocking/throttling. Temps are in the low 60s to low 70s.

On top of that, my load and idle temps are both around 7-10 degrees hotter when C-states are disabled, even during identical loads/frequencies/voltages, etc. I never had this issue either with my 2500k or 4930k. My 4930k idled at 20 C even with c-states off as long as the vcore and frequencies all dropped to my idle settings.

So I'm damned if I do and damned if I don't with Haswell. Something isn't right here and I don't know what to do.
Edited by spin5000 - 3/29/15 at 9:16am
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