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Gigabyte GA-P35-DS3L Thread - Page 396

post #3951 of 4644
Hi folks,

Thanks to everyone on this board for valuable info on P35-DS3L.

I have weird vDDR behavior on P35-DS3L mobo. BIOS setting and reading are too much off. Discrepancy is up to 0.2V:

Code:
vDDR
Settings       Readings
Normal          1.84 V
+0.1            1.84 V (same as normal)
+0.2            1.904 V
+0.3            1.968 V
+0.4            2.02 – 2.06 V
+0.5            2.08 – 2.12 V
My 800 DDR2 requires 2.1V in EPP mode. Normal vDDR voltage on the board is 1.8V. "+0.4V" vDDR setting gives barely 2.05V readings when idling (supposed to be 2.2V) and 1.96V under load.

The RAM worked perfectly @ 819MHz, 4-4-4-12 for ~2 years with vDDR setting “+0.4V”. After upgrading CPU I am trying to run RAM at 1:1 ratio, 920 MHz, 5-4-4-15 stably so far. MemTest shows no errors up to DDR 960MHz. But CPU OC test produces errors at DDR 930MHz disappearing after applying vDDR +0.5V. [I doubt that Memtest is capable to exercise RAM "at-speed"... So, I am not surprised]

My questions are:
1) Do you observe similar vDDR setting/readings discrepancy? How do you deal with it?
2) What voltage settings should I apply under such circumstances? Should I trust readings? What vDDR range is "reasonably safe" from your experience?

Thanks
------------
Comp info:
- mobo: P35-DS3L, BIOS F9
- CPU: E8400 E0
- RAM: Corsair TWIN2X2048-6400C4 ver2.1, 2 sticks
- OS: Win XP32
Edited by AlexT7 - 10/4/09 at 11:16am
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post #3952 of 4644
Quote:
Originally Posted by AlexT7 View Post
1) Do you observe similar vDDR setting/readings discrepancy? How do you deal with it?
This board is known to have voltage issues, more predominantly with Vcore, there is no way to "deal" with it. I'm pretty sure there is a voltage mod, but for the CPU, not the RAM.

Quote:
Originally Posted by AlexT7 View Post
2) What voltage settings should I apply under such circumstances? Should I trust readings? What vDDR range is "reasonably safe" from your experience?
Here in lies your problem. No one can effectively tell you what to believe. YOU need to trust the programs your using. It is not out of the question to have RAM also not use it's spec'd voltage requirement. If you trust the readings your seeing, then I don't see +0.5v to be outrageous, if your RAM is rated to run @2.1v with EPP, a little over voltage can't hurt. I run my 1.8v RAM @ 2.1v 24/7 and have had no issues.
Edited by Avacado - 10/4/09 at 10:49am
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post #3953 of 4644
Quote:
Originally Posted by Rallo View Post
Sorry everyone but i'm a noob to oc, all though i have been reading article after article trying to familiarize my self with proper procedures to do this and most of the stuff in this thread have been helpful except for a few small things. This threaad is so long i didnt have time to read everything single reply so I appoligize if this has been covered already.

Can I assume correctly that CPU Host frequency in the M.I.T screen is the FSB? If so....
- I have been adjusting it a little at a time but no matter what number i put when i restart the comp it resets is back to 333mhz even if i put it to 335mhz
- I put everything else to manual from there defaults like the preformance to standard and all the voltages to manual before I messed with the FSB and it was all good

Second question is when i change the timings on my memory do i have to change the voltages or anything else as well? I have 2 x 2Gb sticks of G-Skill DDR2 1066, factory timing is 5-5-5-15 but CPU-Z shows its 5-7-7-20.

Any help/advise would be appreciated.
You are right in your assumptions. First off, what multiplier are you using with your CPU? x10? If you are getting restarts, you probably need to increase your CPU Voltage.

Tell me what Multi your using, what last known stable settings are, voltage being used, etc.... from there I can help you tweak.
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post #3954 of 4644
Avocado, thank you for quick reply.

I am aware of voltage issues with this board as far as CPU core voltage is concerned. vCORE drooping in a range of 30-50mV is quite common for this board. The vCORE readings normally consistently track the settings. And vCORE drooping is made by design for a reason.

In my case vDDR discrepancy is 200mv (in order of magnitude higher)! And the readings don't follow the settings whatsoever as shown in original message. So I would not call it "drooping". I did not find anyone's complain on so high vDDR drooping. I wanted to know if anyone had similar vDDR behavior on this board and their experience in that respect.

And I did not have good understanding of what the "little over voltage" for a ram with EPP mode was. Over volt allowances for standard DDR2 1.8 V and EPP mode voltage (2.1V) could be quite different.
Edited by AlexT7 - 10/4/09 at 6:24pm
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post #3955 of 4644
Quote:
Originally Posted by AlexT7 View Post
Avocado, thank you for quick reply.

I am aware of voltage issues with this board as far as CPU core voltage is concerned. vCORE drooping in a range of 30-50mV is quite common for this board. The vCORE readings normally consistently track the settings. And vCORE drooping is made by design for a reason.

In my case vDDR discrepancy is 200mv (in order of magnitude higher)! And the readings don't follow the settings whatsoever as shown in original message. So I would not call it "drooping". I did not find anyone's complain on so high vDDR drooping. I wanted to know if anyone had similar vDDR behavior on this board and their experience in that respect.

And I did not have good understanding of what the "little over voltage" for a ram with EPP mode was. Over volt allowances for standard DDR2 1.8 V and EPP mode voltage (2.1V) could be quite different.

You are right a 200mv is a big discrepancy, like I stated before, I don't want to give harmful information, so you need to decide if you trust your monitoring programs, or if in fact there really is an issue with your board. Thank you for restating your question.... No, I have never had an issue with RAM voltage. No I have never known anyone else to have a RAM voltage issue with this board, which is why i'm perplexed on this problem.

Lastly My ram is spec'd at 1.8v JEDEC, I have successfully ran it at 500MHz wich is EPP @ 2.2v, though it is rated at 2.1v for that setting. I have never had a memtest error, or other errors for that matter.

You answered my responce more articulately then anyone in this thread, and seem to have a general knowledge of voltage and this board yet you haven't even taken the time to fill in your system specifications in the User CP so that I could have assisted you better. I also believe with what you responded to me that you already know what you need to do.... This board is outdated, and isn't going to be getting any more BIOS revisions if you know what I mean. Check out the UD3P.

GL
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post #3956 of 4644
Thanks Avocado,

This time your answer is more informative.

Quote:
Originally Posted by Avacado View Post
... I have successfully ran it at 500MHz wich is EPP @ 2.2v, though it is rated at 2.1v for that setting. I have never had a memtest error, or other errors for that matter.
GL
I' am not sure if I can reach 2.2.V even after applying max "+0.7V" (did not try).

Quote:
...This board is outdated, and isn't going to be getting any more BIOS revisions if you know what I mean. Check out the UD3P.
GL
I guess it is a problem with my board, not with BIOS.
Yes, I know what you mean. This board is oudated. The idea of buying a new LGA775 board isn't "smiling" at me. LGA775 is outdating... very soon.

Thanks again
Edited by AlexT7 - 10/12/09 at 11:45pm
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post #3957 of 4644
LOL, im geting idle temps of 27ºC now (OC 3.25ghz now from 2.2) in stable.. its evident winter is coming
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post #3958 of 4644
hey, i get the same issue with my board.

to achieve 2.1vdimm i need to set it to +5 in the bios.

everest says its at 2.11.

wierd yes, but not the end of the world.
post #3959 of 4644
I'm currently trying to squeeze every bit of performance I can get out of my G0 Q6600, at the moment it's at 3.8GHZ stable. The problem I'm encountering though is that the vdroop on this board is so insane that I already have it set to 1.6Vcore in the BIOS (which is about 1.5 idle and 1.488 under load according to CPU-Z), and I can't see a way of increasing the Vcore incrementally beyond 1.6. The next setting above 1.6 is 1.8 followed by 2.0, which is obviously far too high.

Do I need to look at doing some kind of Vdroop pencil mod now or is there a way to increase the voltage above 1.6 incrementally on this board?
post #3960 of 4644
Quote:
Originally Posted by new character View Post
I'm currently trying to squeeze every bit of performance I can get out of my G0 Q6600, at the moment it's at 3.8GHZ stable. The problem I'm encountering though is that the vdroop on this board is so insane that I already have it set to 1.6Vcore in the BIOS (which is about 1.5 idle and 1.488 under load according to CPU-Z), and I can't see a way of increasing the Vcore incrementally beyond 1.6. The next setting above 1.6 is 1.8 followed by 2.0, which is obviously far too high.

Do I need to look at doing some kind of Vdroop pencil mod now or is there a way to increase the voltage above 1.6 incrementally on this board?

The mere fact that your Q6600 is a 3.8GHz and stable on this board is nothing short of a miracle. I don't believe your going to get much more out of this board. Your FSB has to be off the charts. If you want to hit 4.0 with your G0, your going to need a different board, or risk frying it.

If however you are serious about it, then this might help http://www.ocforums.com/showthread.php?t=558347
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Sky
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