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Memtest86+ errors, can't isolate the DIMM - Page 2

post #11 of 17
Thread Starter 
Damn, got another error on the 6th run. See OP for detail as usual.
More voltage to the northbridge?

EDIT: I don't get it. It worked for longer at with the NB at 1.20v than it did at 1.1v and 1.24v. It doesn't make sense.
Edited by [Adz] - 11/1/10 at 3:32pm
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post #12 of 17
Quote:
Originally Posted by [Adz] View Post
OCZ says 1.65v to run the kit at 1600 with 9-9-9-24 timings with 2T command rate.
I ran it at 1.66v which was unstable.

BUT, so far, Kremtok's suggestion of increasing the northbridge voltage seems to be working. It's completed one pass with no errors, which it's never done before at this speed. It's doing test 7 on the second pass right now. So far, so good.
If it can reach 4 hours stable, I'll switch it to test 7 only (since that's where it always failed) and run it overnight.
ih didnt notice you were on a P45.with a quad core and 4GB you might need 1.24v to 1.32v mch for 400fsb.i know for 4GB and Q9650 i needed 1.44v mch
    
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post #13 of 17
I found that there's an upper limit to the effectiveness of raising northbridge voltage, and it looks like that's what you're seeing too. Keep it where it ran best, then try raising the memory voltage just a tad.

Do you have some other RAM you can try out in the board? Do you have another board where you can try the RAM? Everything I see points to a motherboard problem, specifically with running your memory in dual channel mode. That's the problem we need to sort out.
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post #14 of 17
Thread Starter 
Quote:
Originally Posted by radaja View Post
ih didnt notice you were on a P45.with a quad core and 4GB you might need 1.24v to 1.32v mch for 400fsb.i know for 4GB and Q9650 i needed 1.44v mch
1.24v didn't work, so I've jumped it to 1.3v
And it's gotten 7 errors in under a minute. o_O
Now it's gone to 11 in under 90 seconds. Test 7 only.
Now 17 in under 2 minutes


Quote:
Originally Posted by kremtok View Post
I found that there's an upper limit to the effectiveness of raising northbridge voltage, and it looks like that's what you're seeing too. Keep it where it ran best, then try raising the memory voltage just a tad.

Do you have some other RAM you can try out in the board? Do you have another board where you can try the RAM? Everything I see points to a motherboard problem, specifically with running your memory in dual channel mode. That's the problem we need to sort out.
1.2v is where it ran for the longest, and I've got it running now at that. 3m into the test, no errors so far which is much better than 1.22, 1.24 and 1.3. That makes no sense though, why would increasing the voltage cause more instability?

I don't have any more RAM or another DDR3 board. I really can't afford this to be a problem with the motherboard. I bought it from a US ebay store MWave (I think) and Gigabyte don't offer warranty for this board in Europe.
So far, there's not a single component that I've not had a problem with in this build - first the original XFX motherboards, then the graphics card, then the CPU and now the RAM or Motherboard again.
Edited by [Adz] - 11/1/10 at 3:52pm
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post #15 of 17
Quote:
Originally Posted by [Adz] View Post
That makes no sense though, why would increasing the voltage cause more instability?

I don't have any more RAM or another DDR3 board. I really can't afford this to be a problem with the motherboard. I bought it from a US ebay store MWave (I think) and Gigabyte don't offer warranty for this board in Europe.
So far, there's not a single component that I've not had a problem with in this build - first the original XFX motherboards, then the graphics card, then the CPU and now the RAM or Motherboard again.
I don't pretend to understand why more voltage leads to less stability. It makes no sense to me, either; but I have noted it in the past and I wanted to share that with you so that you don't think you're going crazy.

Here's what we know so far - Each DIMM works flawlessly at rated speed, timing, and voltage by itself. When both DIMMs are run together in dual-channel mode, they fail MemTest86+. Increasing MCH voltage allows the test to run longer without failing, but in the end, it still fails.

Let's go into strange question land, because I truly don't know what to do other than that. Can you run two DIMMs in single channel mode? Is your memory linked to your FSB? Does raising DDR3 voltage in addition to MCH voltage add stability?
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post #16 of 17
Thread Starter 
Quote:
Originally Posted by kremtok View Post
I don't pretend to understand why more voltage leads to less stability. It makes no sense to me, either; but I have noted it in the past and I wanted to share that with you so that you don't think you're going crazy.

Here's what we know so far - Each DIMM works flawlessly at rated speed, timing, and voltage by itself. When both DIMMs are run together in dual-channel mode, they fail MemTest86+. Increasing MCH voltage allows the test to run longer without failing, but in the end, it still fails.

Let's go into strange question land, because I truly don't know what to do other than that. Can you run two DIMMs in single channel mode? Is your memory linked to your FSB? Does raising DDR3 voltage in addition to MCH voltage add stability?
At the moment, I'm still running the Tenth test (1.2v MCH Core, 1.66v DRAM voltage) - test 7 only.
It's stable at the moment - 40 minutes in, 4 passes complete, no errors.

Strange questions:
1) I haven't tried 2 DIMMs single channel yet, but if this test fails, I'll try that as well
2) It is linked. The frequency latch is set to Auto, memory multiplier is 4.00D (FSB is 400MHz). At 1600MHz dual channel, that's 1:2 FSB : DRAM.
3) I've still got the DRAM voltage at 1.66v. How much higher is safe?
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post #17 of 17
Thread Starter 
I give up. I left it overnight, woke up six hours later and it's on 44, showing an error in pass 24. I'll run it at lower frequencies, drop the timings and hopefully that will give me better performance anyway.
Thanks for trying.

EDIT:
For the sake of satisfying my curiosity, I took the MCH Core up to 1.44v, but the higher I took it, the faster the errors rolled in.
Then I noticed something: in the PC Health Status window (BIOS), the DDR15V was saying 1.63v, even though I set it the DRAM voltage as 1.66v. vDrop on the RAM? I didn't think that existed...

So, I upped the DRAM voltage in BIOS. At 1.68 setting, I got 1.64v actual. So I bumped it to 1.7v which gave me 1.68 actual. Except, at 1600MHz, with 1.7v it won't POST. Keeps resetting. But if I drop the multiplier to bring it down to 1280, it does boot.
What the...
Edited by [Adz] - 11/1/10 at 11:48pm
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