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post #6431 of 9343
Quote:
Originally Posted by am dew1 View Post

I have a similar situation in that I set the manual vcore to 1.28v. What would be a good starting point using offset voltage instead?

This is the speed step feature. I would set the off set to + and then something like .025 and go from there. If stable then lower until unstable. Opposite if unstable at .025.
post #6432 of 9343
Quote:
Originally Posted by selluminis View Post

This is the speed step feature. I would set the off set to + and then something like .025 and go from there. If stable then lower until unstable. Opposite if unstable at .025.

Thanks. I did as suggested and then ran Prime95 for a bit and all was stable. I then dropped the offset to .015 and all seems OK so far. I do see now that my idle Vcore is low...varies in the .7xx to .9xx range per CPU-Z and tops out at 1.312 during Prime95 blend test. I guess you trade off a little higher voltage during full OC for a consistently low voltage when idle....makes sense. I don't do things to fully OC my system a lot so this should be good.
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post #6433 of 9343
Quote:
Originally Posted by am dew1 View Post

Quote:
Originally Posted by selluminis View Post

This is the speed step feature. I would set the off set to + and then something like .025 and go from there. If stable then lower until unstable. Opposite if unstable at .025.

Thanks. I did as suggested and then ran Prime95 for a bit and all was stable. I then dropped the offset to .015 and all seems OK so far. I do see now that my idle Vcore is low...varies in the .7xx to .9xx range per CPU-Z and tops out at 1.312 during Prime95 blend test. I guess you trade off a little higher voltage during full OC for a consistently low voltage when idle....makes sense. I don't do things to fully OC my system a lot so this should be good.


As I learned not too long ago, you can increase your idle voltage to your desired value using offset. (Mine is stable at around 0.920 Vcore on idle.) And then you can use the turbo boost voltage to increase your load voltages to meet demand at high loads. This way you don't have to trade off high voltage at full OC.

 

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post #6434 of 9343
Quote:
Originally Posted by shad0wfax View Post

The 140% current, extreme phase control, and manual VRM at 350 should get you all the way to 5.0 GHz, assuming the rest of your system can handle that frequency, should you ever decide to push that far.

I also use the Duty Control Extreme and recommend that as well.

LLC Medium is a value that I came up with on my own.

Spread Spectrum disabled is also something that you have to experiment with on a case-by-case basis.
I've duplicated most of your profile (as seen here), except the manual CPU PLL voltage (left it on auto).

At x45, offset +0.050V and +0.030V pass a quick 1344/1792 prime95, while offset +0.010V crashes after a few seconds.

I let a custom blend run the night (x45, offset +0.030V) but it failed somewhere.

Noob inside: I didn't set realtemp to log to a file, so I don't know when it failed, as I've found the PC restarted, already in Windows. Anyway, it failed after more than 3 hours. Maybe I can see time (and failure code) via the memory dumps done by Windows.

I've just started another one at +0.040V. Starting to think that the Auto-OC was not that bad rolleyes.gif

MaX.
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post #6435 of 9343
Quote:
Originally Posted by shad0wfax View Post



As I learned not too long ago, you can increase your idle voltage to your desired value using offset. (Mine is stable at around 0.920 Vcore on idle.) And then you can use the turbo boost voltage to increase your load voltages to meet demand at high loads. This way you don't have to trade off high voltage at full OC.

At first I set the offset at +0.005 and the result in cpu-z was 1.32 under load, 1.00 V when idle. I got similar results when I leave everything on auto and just rising the multiplier.
Now I set the offset at -0.005 and I got 1.31 under load and 0.991 V when idle. Do you know what value is stable for this CPU when idle ? Should I continue to drop the offset ?
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post #6436 of 9343
This is different on every SB chip you can drop the offset till it's not stable in idele and then one or two notches up. Also with LLC you can have some control over Idle vcore. The lower the LLC the more vcore in idle you will have. This at the cost of vdrops under load. You will have to play around with those settings. But finding the right valeus for LLC and offset makes the chip stable under both conditions while minimizing power usage. It's worth it IMO.
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post #6437 of 9343
I passed 12hrs blend at x45, +0.040V offset (Vcore = 1.360V under load).

See this post.

If it can stand 4hrs of cod4, it's all good for me smile.gifsmile.gif

Thanks shadowfax.

MaX.
Edited by HornetMaX - 2/14/12 at 11:30am
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post #6438 of 9343
Is there a reason why Vcore is dropping while testing with Prime?
Yesterday I set offset (-0.020) and my PC booted normally @ 4.5GHz . I noticed on cpu-z, while windows was booting, vcore 1.27 - 1.30, on idle was 0.967. My PC was totally stable for hours playing Battlefield, running 3dmark, browsing with vcore @ 1.27 - 1.29. While I finally decided to test with Prime noticed that the vcore started at first with 1.27 - 1.26 then in next 1 hour was constantly dropping, until 1.25 - 1.24 V when my Windows finally gave me BSOD. Is this a normal behavior with Prime? I have 16Gigs of RAM and I set on Prime to use 11 or 12 of them.
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post #6439 of 9343
Quote:
Originally Posted by zerozed View Post

Is there a reason why Vcore is dropping while testing with Prime?
Yesterday I set offset (-0.020) and my PC booted normally @ 4.5GHz . I noticed on cpu-z, while windows was booting, vcore 1.27 - 1.30, on idle was 0.967. My PC was totally stable for hours playing Battlefield, running 3dmark, browsing with vcore @ 1.27 - 1.29. While I finally decided to test with Prime noticed that the vcore started at first with 1.27 - 1.26 then in next 1 hour was constantly dropping, until 1.25 - 1.24 V when my Windows finally gave me BSOD. Is this a normal behavior with Prime? I have 16Gigs of RAM and I set on Prime to use 11 or 12 of them.


That would be Vdroop kicking in, and it's normal behavior with the Intel Core series CPUs. The greater the load, the more the core voltage tends to drop. (Changing your LLC value can reduce the amount it drops by, or you can increase the offset voltage or manual voltage or turbo voltage to counteract Vdroop, if the droop causes you bluescreens. If the droop isn't causing you bluescreens, there's no reason to mess with voltages.)

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post #6440 of 9343
Quote:
Originally Posted by HornetMaX View Post

Quote:
Originally Posted by shad0wfax View Post

The 140% current, extreme phase control, and manual VRM at 350 should get you all the way to 5.0 GHz, assuming the rest of your system can handle that frequency, should you ever decide to push that far.

I also use the Duty Control Extreme and recommend that as well.

LLC Medium is a value that I came up with on my own.

Spread Spectrum disabled is also something that you have to experiment with on a case-by-case basis.
I've duplicated most of your profile (as seen here), except the manual CPU PLL voltage (left it on auto).

At x45, offset +0.050V and +0.030V pass a quick 1344/1792 prime95, while offset +0.010V crashes after a few seconds.

I let a custom blend run the night (x45, offset +0.030V) but it failed somewhere.

Noob inside: I didn't set realtemp to log to a file, so I don't know when it failed, as I've found the PC restarted, already in Windows. Anyway, it failed after more than 3 hours. Maybe I can see time (and failure code) via the memory dumps done by Windows.

I've just started another one at +0.040V. Starting to think that the Auto-OC was not that bad rolleyes.gif

MaX.


Ah, I've changed my profile to a more efficient setup. Here's the link to my new set-up:

 

http://www.overclock.net/t/968053/official-the-sandy-stable-club-guides-voltages-temps-bios-templates-inc-spreadsheet/7240#post_16449965

 

The PLL voltage is usually not necessary to tweak, but I actually reduced mine clear down to 1.550V in the above link and had good results with it. I've actually booted into the OS at 5.2 GHz now, can run 5.0 GHz stable (but with 89-92C temperatures in IBT / Prime Small FFT that I'm not at all comfortable with) and I'm working on an efficient and low-temp 4.9 GHz profile, if I can get it 18 hour Prime95 custom blend stable.

 

Do check my new settings though for a more efficient model.

 

Also, you can check to see where your tests failed by consulting the Prime95 folder and looking for the file "results.txt" where you will find the last successful FFT lengths tested.

 

Then you can check this list of all FFT lengths that a Prime 95 Blend test will run on an i5:

 

This is a list of all FFT lengths that will be tested on an i5 in Prime95 Blend (Click to show)

 

  1. 640K
  2. 8K
  3. 720K
  4. 12K
  5. 800K
  6. 16K
  7. 960K
  8. 24K
  9. 1120K
  10. 32K
  11. 1200K
  12. 48K
  13. 1344K
  14. 64K
  15. 1536K
  16. 80K
  17. 1680K
  18. 96K
  19. 1792K
  20. 128K
  21. 2048K
  22. 160K
  23. 2304K
  24. 224K
  25. 2560K
  26. 256K
  27. 2800K
  28. 320K
  29. 3072K
  30. 384K
  31. 3360K
  32. 448K
  33. 3584K
  34. 512K
  35. 576K
  36. 672K
  37. 10K
  38. 768K
  39. 14K
  40. 896K
  41. 20K
  42. 1024K
  43. 28K
  44. 1152K
  45. 40K
  46. 1280K
  47. 56K
  48. 1440K
  49. 72K
  50. 1600K
  51. 84K
  52. 1728K
  53. 112K
  54. 1920K
  55. 144K
  56. 2240K
  57. 192K
  58. 2400K
  59. 240K
  60. 2688K
  61. 288K
  62. 2880K
  63. 336K
  64. 3200K
  65. 400K
  66. 3456K
  67. 480K
  68. 3840K
  69. 560K
  70. 4096K

 

 

Most Sandy Bridge seem to have trouble with the 1344 and 1792 lengths, which are tested in that time period. However, on my machine, it's the test #60 at 2688K that will cause me to fail usually, and that doesn't happen until around the 15 hour mark at the default 15 minute time frame.

 

If you're going to leave the default time to run each FFT at 15 minutes, it will take you about 17.5 to 18 hours to finish all FFT lengths in a Blend test (assuming that there aren't core imbalances.)

 

If you shorten the time to 10 minutes per FFT length, you can test all of them in about 12 hours, again assuming no core imbalances.

 

If you're looking for a quick and dirty OC test, just to see if your latest setting is moderately stable, you can shorten the time to test each FFT to 1 minute and after around 70 minutes you should be done. :)

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