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Intel C1E & EIST when overclocking

Poll Results: Disable c1e & eist

 
  • 69% (37)
    I disable c1e and eist because I read about it
  • 18% (10)
    I disable c1e and eist because I had unstable oc with these options enabled
  • 11% (6)
    I always leave these options enabled because they cause any problem
53 Total Votes  
post #1 of 25
Thread Starter 
I would like to know how many here think that disabling c1e and eist is a pre-requisite to get a stable overclock.

The reason I asked the question is that, over the years, I overclocked well over 100 Intel cpus and never had a problem leaving these options enabled. So, I would like to know where did the disabling of c1e and eist originated?
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post #2 of 25
Don't forget Spread Spectrum.
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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post #3 of 25
it's not a problem, they just want to run their chip full throttle all the time.
    
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post #4 of 25
you can leave these enabled but I don't like the thought of my cpu "throttling" speeds just to save power. I prefer my cpu to always be overclocked.
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post #5 of 25
I've never actually experienced issues with it and have actually scored better in superPI with them on, lol. A person I know said it caused games to crash but who knows.
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post #6 of 25
I disable it to lessen any likely hood of possible failure, just one less variable to help my oc quest.
..and I also hate it when CPUZ throttles back and forth (more than anything).
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post #7 of 25
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
Don't forget Spread Spectrum.

I didn't forget Spread Spectrum, everyone knows that it's better to disable Spread Spectrum while overclocking. I just want to know why there is that urban legend that c1e and eist have to be disabled while overclocking.
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Pegasus
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post #8 of 25
I read over on XS that if you use load line calibration, it can reduce vdroop, but it will become unstable when introduced to an overhead voltage spike, but that this spike would be reduced if you disabled the speedstepping.

The reason behind this was that speedstep drops the voltage and multi when you are at idle, this voltage decrease causes this "spike" an unstability to occur.

EDIT: as for spread spectrum, all I know is that it is used to protect your PC from electromagnetic interference, I turn it off though.
Edited by tbates1244 - 2/18/09 at 10:01pm
post #9 of 25
Thread Starter 
Quote:
Originally Posted by lenzo View Post
I disable it to lessen any likely hood of possible failure, just one less variable to help my oc quest.
..and I also hate it when CPUZ throttles back and forth (more than anything).
That's the only valid reason I know of.

It's also true that c1e and eist enabled, might slightly lower your superpie scores.
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post #10 of 25
This might be just for the 680i/780i. Here's an excerpt from the NVIDIA 680i/780i Overclocking Guide on page 9 (page 15 in Acrobat Reader):

Quote:
Before you begin overclocking your system, you must first disable a few features that would prevent your system from reaching its maximum potential. More specifically, the following BIOS settings must be disabled:
  • CPU Thermal Control
  • C1E Enhanced Halt State
  • Intel Speedstep
And then it continues on the next page:
Quote:
We must also disable the spread spectrum features of the system before we begin overclocking:
And then it shows you how to disable all of the things that say Spread Spectrum.

So, either this is just related to the nForce chipset, or it applies to all Intel motherboards.

Either way, when I started overclocking back in April, it seemed like everyone who had an Intel CPU was disabling these things.
It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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