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Sandy Bridge Offset Voltage - Page 2

post #11 of 19
Quote:
Originally Posted by oceanlyner View Post

I have read a lot of the guides here, but I'm still a little bit stuck.

I have 4.5GHz stable with IBT (20 pass max), FFTs 1344 and 1792 (an hour each), and about I am about 4 hours into a blend test. This is at 1.325v, PLL at 1.7v, the rest at auto.

I wanted to go offset so I wouldn't have 1.3v pumping through my chip all the time. My VID is 1.396 at load and CPU-Z reads 1.356v, going off the guides this equals a -0.04v offset? But it wont boot, and so far I have seen a 9C and 7E blue screen code, after that I gave up.

Anyone got any advice? Or am I missing something stupid?
 

 

Hi oceanlyner,

 

Hello there. :) I'm new to overclocking and happily overclocked at 4.5GHz (tried other clocks as well, but kept 4.5GHz as my long-term use) with a Gigabyte board (GA-P67A-UD7-B3) using Offset Voltage and no Load-Line Calibration.

 

Surprising to see that you are having problems...just to share, one of your old posts actually helped me when I was starting. This was your exact post that was my starting point for Offset Voltage Method of overclocking: http://www.overclock.net/t/1230066/looking-for-a-nice-guide-for-overclocking-2500k-on-a-gigabyte-board#post_16733530. Incidentally I pondered on the same query i.e. whether to use negative or positive Offset value since most people here talk about negative offset. I got my clarification here and two more posts after that.

 

I ended up having 1.332v VCore (as reported in BIOS, like yours actually). For Gigabyte boards, this will be an Offset Voltage of somewhere between +0.025 to +0.035.

 

I frequent the "Sandy Stable Club" as I use most of the guides there in the First Page.

 

If you are interested in Offset Voltage Overclocking along with LLC, you may be interested in a "modified" BIOS version called F3H. I asked one forum member for a copy for my specific Gigabyte board. I posted something here. If you are going to use this BIOS Version (in effect, Offset Voltage with LLC), I found that I had to use a negative offset to arrive at the same VCore voltage of 1.332...it was at around -0.040v. ;)

 

My suggestions:

 

  1. "Find" your overclock first using Offset Voltage Method without playing with CPU PLL and QPI/Vtt Voltages first.
  2. For RAM, mine was 1600MHz 9-9-9-24 (T2) on the sticker (Corsair) at 1.65v but in BIOS it reports as 1333MHz 9-9-9-24 (T1) at 1.50v. Instead of enabling an XMP profile, note down the DRAM and Vtt voltages that it shows, and then just manually configure it in the BIOS.
  3. Once you "find" your overclock at 4.5GHz, next step is to start playing around with the CPU PLL Voltage. Do note though, that even before I learned how to tweak CPU PLL, I was able to complete a 12-hour Prime95 Regular Blend and make an official submission to the Sandy Stable Club.

 

I just thought of responding to "pay it forward" and to let you realize that you actually helped another person learn how to overclock! :)

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post #12 of 19
When using a Offset voltage it is recommended to use a lower LLC level with more offset,

Or otherwhise you can crash because it doesnt get enough voltage below the 100% load level.
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post #13 of 19
Quote:
Originally Posted by prescotter View Post

When using a Offset voltage it is recommended to use a lower LLC level with more offset,

Or otherwhise you can crash because it doesnt get enough voltage below the 100% load level.

 

Thanks for the tip. However, in my board (and most likely for oceanlyner) - Gigabyte...when we enable "Offset Voltage" (called Dynamic VID for Gigabyte boards), Multi-Step LLC is grayed out. :( There's a modded BIOS that I found for my board (GA-P67A-UD7-B3) though that enables that.

 

With respect to your post...that's what I found to be "unique" (?) or different with the Gigabyte boards. When I tried the modded BIOS, I had to set the Offset Voltage way too low even with just the "light" LLC Level (I went as far as -0.050) to achieve, say, a BIOS-reported VCore of 1.320v. But since it's a modded BIOS, it only has 2 LLC Levels (that's the best I can get...better than no LLC with Offset as with official BIOS versions). OCN User Sin0822 mentioned though, that this modded BIOS kept the 2 best LLC levels from the original 10 that is normally found on the latest official BIOS versions. So maybe that's the reason why even with a "light" LLC Level (Level 1) I had to go with a very low negative Offset Voltage...perhaps even Level 1 LLC has a very "strong" flavor, so to speak.

 

Or maybe because more users own motherboards from the Asus Family so documentation is aplenty for Offset Voltage Overclocking compared to Gigabyte. While being new to overclocking, I have embarked on a journey to do as much tweaking as I can and documenting them, in the hopes that it can help others. I myself had very little documentation (as far as Offset Voltage Overclocking) to go with...in fact I was very fortunate to have stumbled upon oceanlyner's old post which became my starting point to learning Offset Voltage OC for Gigabyte, which I wanted to pay forward. :)

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post #14 of 19
Thread Starter 
Haha, thanks. Yeah I thought I knew more than I did then, glad I helped though.

I had a offset overclock for about a year. 4.5GHz at +0.055 ( High I know), but this was never 100% stable. So I wanted to do it properly this time round, but thats not working out so great..

Seems you have played around a lot more than I have, going to try some of your suggestions now.
post #15 of 19
Quote:
Originally Posted by oceanlyner View Post

Haha, thanks. Yeah I thought I knew more than I did then, glad I helped though.

I had a offset overclock for about a year. 4.5GHz at +0.055 ( High I know), but this was never 100% stable. So I wanted to do it properly this time round, but thats not working out so great..

Seems you have played around a lot more than I have, going to try some of your suggestions now.

 

Glad to hear. :)

 

I'm pretty new to overclocking myself (I'd say a little over a month...I lost track, lol). I was never into overclocking prior and was running my 2700K at stock for more than a year. I guess I just got a little too curious, hehehe...

 

While I have been recently playing a lot (due to my curiosity), for most of the time I stick by the steps you laid out in your old post:

 

  1. Went into BIOS.
  2. Set the Offset Voltage Valude (DVID) to +0.050 as the "base" or starting point.
  3. Instead of using the pre-configured XMP per your guide, I manually configured it. I set XMP first so I can copy/take note of the VTT Voltage, DRAM Voltage, and Command Rate.
  4. I didn't play with the Power-Saving Options (C1E, C3/C6, EIST, and Thermal "something"). I just kept them on "Enable".
  5. Max TDP: I set this to 200 Watts.
  6. Multiplier: I set 45x on all 4 Cores.
  7. LLC: Obviously we couldn't use this on a Gigabyte board when enabling Offset Voltage method.
  8. PLL Overvoltage: Disabled
  9. Real-Time Changes in OS: Disabled
  10. Save and Reboot.
  11. Then I would do stress test (which obviously will pass since +0.050 was a "strong flavor" of VCore).
  12. Reboot and go into BIOS.
  13. Reduced Offset Voltage value one "notch" down (+0.045).
  14. Repeat Steps 1 to 13 until you get to an Offset Voltage Value that is "unstable".
  15. Reboot and go into BIOS again.
  16. Increase Offset Voltage Value by one "notch" up.
  17. Stress Test again.
  18. (wash, rinse, repeat)

 

Please don't mind my recent posts about playing with CPU PLL Voltage as I'm just playing around with it. As mentioned in my previous post, I finished the 12-hour Prime95 Regular Blend Test by following purely your instructions. :)

 

Using your instructions, please expect VCore to "droop" when stress-testing. So aside from the BIOS-reported VCore, I also keep in mind the "lowest-drooped-VCore-when-stress-testing" VCore voltage when I make adjustments.

 

Typically, without any LLC used, voltage drops around 4-5 increments/notches from your BIOS-reported VCore. I have recorded ALL my stress-testing sessions via HWiNFO and compared all of them in a spreadsheet so my statement is pretty consistent. For example:

 

  1. BIOS-reported VCore is 1.332v...when you do a 12-hour stress test, you would see incremental drops of 1.308 (it skips the 1.320v increment), 1.292v, 1.284v, and 1.272v.
  2. If you adjust your BIOS-reported VCore to let's say, 1.320v, then you would see 1.292 (it skips the 1.308v increment), 1.284v, 1.272v, and 1.264v.
  3. Chips may vary which is why I can say that there is a variance (4-5 incremental drops) to make an acceptable variance.
  4. I also noticed that BIOS versions somehow play a part to how "low" or "high" of tweaking you can do. Back when I was using the latest-official F7 version of BIOS, my Offset Voltage Value was +0.035 to get to 1.332v or 1.344v BIOS-reported VCore. In this current "modified" BIOS of F3H (which by the way, allows you to use 2 Levels of LLC along with Offset Voltages), an Offset Voltage Value of +0.020 gets me to 1.332v of BIOS-reported VCore.

 

BONUS: If you have time, please read my post about playing around with the CPU PLL Voltage, specifically the part where I mentioned a "suggestion". In a nutshell, say for example a 4.5GHz overclock, you can try to tweak so that your lowest possible VCore at load will be 1.272v or even 1.264v. However, in my experience, the "net loss" (time/effort/energy) to achieve such is more than the "net gain" I was expecting. I did not see improved temperatures...best I saw was 1 degree Celsius.

 

And again, that was my experience...with my processor. To quote most experts in this wonderful forum site, "Your Mileage May Vary (YMMV)". I never bothered to settle with LLC usage as well (I did a lot of tests with these too)...not because of "longevity issues", but more of "net gains versus net loss" as I have mentioned. Perhaps, this is because we are talking about medium overclocks. I assume that, for high overclocks, a few degrees of temperature improvement, a single notch up/down on voltage, etc. is a big thing and very important.

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post #16 of 19
Thread Starter 
So I'm pretty confident I have it stable now. Coming up on 20 hours of custom blend.

Turns out a lot of my issues may have been due to the UEFI bios I was running. Flashing back to the award bios most of my problems disappeared...

I'm at 4.5GHz, +0.035V, VTT at 1.1v and PLL at 1.7v (Tried 1.6 and got x124).

Pretty content with this now, may go back and play with PLL some more. But for now I'm enjoying no crashes.
post #17 of 19
Quote:
Originally Posted by oceanlyner View Post

So I'm pretty confident I have it stable now. Coming up on 20 hours of custom blend.

Turns out a lot of my issues may have been due to the UEFI bios I was running. Flashing back to the award bios most of my problems disappeared...

I'm at 4.5GHz, +0.035V, VTT at 1.1v and PLL at 1.7v (Tried 1.6 and got x124).

Pretty content with this now, may go back and play with PLL some more. But for now I'm enjoying no crashes.

 

Nice to hear and congrats! cheers.gif

 

Based on Sin0822's guide at Post #2, CPU PLL of 1.7v is already considered well and good. I'm not aware of any further benefits for going lower...it just so happened that I tried out munaim1's method of starting out low on all voltages and when the BSOD changed from error 124 to 101 at 1.600v, that was my cue/indicator that I may have found the "sweet spot" for the CPU PLL Voltage (since BSOD 101 usually means "add more VCore" as per the guide).

 

I documented my attempt/steps taken here and here so that I would not forget (and at the same time, hope that it may help others in return). smile.gif

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post #18 of 19
Thread Starter 
Grr. Had a 101 between 20 and 24 hours. Oh well I prefer that to 124.

Bumped up the vcore 0.005 and I will try again.
post #19 of 19
Quote:
Originally Posted by oceanlyner View Post

Grr. Had a 101 between 20 and 24 hours. Oh well I prefer that to 124.

Bumped up the vcore 0.005 and I will try again.

 

Hm. What VCore (as reported in BIOS) did you get with +0.035 Offset Value? When I did my 4.5GHz using +0.035 I got either 1.332v or 1.344v VCore (as reported in BIOS)...can't remember which.

 

Setting your CPU PLL and Vtt to default/stock values will reduce the variables involved. Then run the stress test and see if it gives you BSOD 101 still between 20th and 24th hour. I never played with CPU PLL and Vtt back then when I submitted my official entry to the Sandy Stable Club, and that particular submission was done with your exact settings in your old post. Also for RAM, I had 2x2GB Corsair 1600MHz @ 1.65v, but by default it ran at 1333MHz, so all I did was just set the SPD (in Memory Menu/Settings) to 16.00, and then in the "Voltages Menu/Screen" I just changed the DRAM Voltage to 1.644v.

 

Here is my 4.4GHz submission: http://www.overclock.net/t/968053/official-the-sandy-stable-club-guides-voltages-temps-bios-templates-inc-spreadsheet/10240#post_19951514

Here is my 4.5GHz submission: http://www.overclock.net/t/968053/official-the-sandy-stable-club-guides-voltages-temps-bios-templates-inc-spreadsheet/10250#post_19951846

 

Hope that these can help you or probably try to use them as "baseline" settings, and then tweak accordingly for your setup. :)

 

If you decide to increase (bump up) your VCore by changing the Offset Voltage Value from +0.035 to +0.040 and it gives you more stability (but no detrimental effect/impact to temperatures) then I would be happy if I were in your case. As mentioned: in my experience with my system, a 1- to 3-notch variance in VCore (for the sake of stability) is not really that bad, especially if it didn't yield you better temperatures.

 

Good luck!

 

ADDITIONAL INFO: In all of my submissions I used only "Regular Blend" and not "Custom Blend", by the way. I searched and have read up on threads here in OCN about Regular versus Custom Blend, and from what I have gathered the general consensus is that it depends on what you mostly use your system for, and that it doesn't necessarily mean that one is a better measure than the other for determining whose rig is more stable.


Edited by topet2k12001 - 5/29/13 at 10:46pm
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OSOSMonitorKeyboard
MS Windows 8 64-bit Ubuntu 12.04 AOC T2242we Logitech K320 
PowerCaseMouseAudio
Corsair AX750 NZXT Switch 810 Gunmetal Edition Logitech M325 Altec Lansing 
CPUMotherboardGraphicsRAM
Intel Core i7-2700K Gigabye GA-P67A-UD7 B3 AMD HD6970 Corsair Dominator 2x2GB CL9 
Hard DriveOSMonitorKeyboard
Western Digital Caviar Blue Windows 8.1 and Ubuntu 12.04 AOC 21.5 inches Logitech K320 
PowerCaseMouseOther
Corsair AX750 Silverstone Temjin 07 Logitech M325 Wireless Mouse EK Supreme HF 
OtherOtherOther
EK FC-6970 EK-FB KIT GA P67A (UD7) EK RAM Dominator 
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