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Need some advice on memory errors - 64gb of Corsair Dominator GT 1866

post #1 of 56
Thread Starter 
Working on a new system, and I decided to test the memory for errors before I get into the overclocking of everything. Right now, everything is running at stock, and the BIOS is using the XMP 1.3 profile for the memory and correctly setting the timings as 9-10-9-27 at 1,866 frequency. These are NOT the timings and speed that get used if I leave the BIOS option set to 'Auto' instead of forcing it to use the profile.

Running Asrock Extreme11 board, 3960X, and 64gb of Corsair Dominator GT 1866

I first started with running the Windows Memory Diagnostic tool, and the memory would pass the standard tests, but would always fail on the extended tests. The message was simply that there was a hardware failure. So I tried it with memtest86 4.0a, and tested each stick individually. It showed errors in 6 of the 8 sticks. The frustrating part was that they seem intermittent. Some sticks would show good after only 1 pass, but would show errors in the next pass. Sometimes a stick wouldn't show any errors until pass 3. Sometimes the errors would come in the very first pass.

I switched over the memtest86+ 4.2. My results were similar.

I switched to the memtest86+ beta 5....and my results were similar.

My questions for forum members with more expertise in this area than I:

1) Why will a stick test good for a pass or two and then error? How many passes is enough to prove the ram is fine?
2) How significant is it if a stick only shows one error?
3) With 6 of the 8 sticks throwing errors in the first two passes....it makes me wonder if something else could be wrong instead of the memory? Are there other things I should try before going the RMA route? Voltage? Timings? etc.

These two kits are not cheap, so I don't want to accept faulty memory. But I'm not 100% confident that I shouldn't be looking at something else before RMA'ing.

Helpl! Advice, comments, ...questions would be welcome. Thanks in advance.

Few other thoughts...since I'm testing individual sticks...and 2 of the have tested good (at least through two passes), I don't think it will be the motherboard slot. Right? And this memory is on the supported list by Asrock. And yes...the memory is firmly seated in the slot and there is nothing foreign on the contact points.
Edited by cpachris - 9/20/12 at 12:17pm
post #2 of 56
1) temperature, voltage, motherboard compatibility issues, or something else; when I run into RAM issues, I'm not satisfied unless I can pass 12 hours worth of memtest. I've never had an error past the 6th test, though.

2) On the chip that had 1 error after the 5th test, I would get intermittent blue-screens. Eventually it corrupted data on the hard drive during file transfers and other things. I'd say you need 0 errors.

3) Obviously the RAM is controlled by the memory controller, so if it's being voltage starved or overclocked more than it can take, then it can have an issue. Remember that the Dominator GTs are actually 1333MHz that are overclock tested at 1866MHz. Don't run them over 1866MHz.


Notes:
- Be sure your BCLK is at 100 and not overclocked.

- Your RAM is a 32GB 4x8GB quad channel package; not a 64GB package; that means that you may need to decrease your timings and/or increase your voltage a bit in order to get 64GB stable.

- Aside from your DRAM voltage, try setting your VCCSA and VTTCPU at 1.1v
From GSkill Tech on X79 platform:
Quote:
IMC (Integrated Memory Controller)

The results for IMC (memory divider frequency scaling) varies considerably. Most CPUs will hold 1600 in full 8 DIMM without issue although considerations for adjusted subtiming and VCCSA and VTT voltages will need to be considered as variance will come into play. It is important to keep in mind profile specifications such as XMP are defined for broad / worst case CPUs as well as lower quality boards as such values defined may be inefficient (and in some cases overtly aggressive causes stability issues).

In addition for long term CPU lifespan and reduction of draw and heat considerations VCCSA and VTT value of 1.100 are advised. When exceeding 1600 speeds 1.150 to 1.200 may be required for 1866+ it is strongly advised you attempt lower operating voltage levels first and if all possible maintain 1.100 as your maximum.
post #3 of 56
Thread Starter 
Thanks for the thoughts.


Quote:
Originally Posted by Electrocutor View Post

I'm not satisfied unless I can pass 12 hours worth of memtest. I've never had an error past the 6th test, though.

How many passes is 12 hours worth for you though? These 8GB sticks take anwhere between 30 minutes and 1 hour to complete a pass. And that is with one stick in there. If I was testing all 64GB at one time...it would take a LONG time to even make it through two passes. Although the Beta5 version of memtest86+ did run much more quickly.



Quote:
Originally Posted by Electrocutor View Post

- Be sure your BCLK is at 100 and not overclocked.

I'm still at 100

Quote:
Originally Posted by Electrocutor View Post

- Your RAM is a 32GB 4x8GB quad channel package; not a 64GB package; that means that you may need to decrease your timings and/or increase your voltage a bit in order to get 64GB stable.

But I'm only testing one stick at a time right now. Still getting errors.

Quote:
Originally Posted by Electrocutor View Post

- Aside from your DRAM voltage, try setting your VCCSA and VTTCPU at 1.1v

I may try that. If you think of anything else let me know. Any suggestions on an initial bump in DRAM voltage?
post #4 of 56
Quote:
I may try that. If you think of anything else let me know. Any suggestions on an initial bump in DRAM voltage?
I've never seen bumping DRAM voltage for Caorsair do anything, but you're welcome to try 1.53 or something if you think it'd help.

When I first installed my RAM, I ran memtest with the system set to auto, and it failed horribly: didn't last 10 minutes. After setting the timings to what Corsair said the kit was tested at, it ran perfectly. RAM sticks are usually packaged into quad kits for a reason: so I'd start by just using 1 set of 32GB and don't mix and match the sticks between kits.
post #5 of 56
Two years ago while playing a FPS I kept getting BSOD's out of the blue with no prier problems, so the first thing I did was run Memtest86 with 512MB setting which increases the amount of time it takes to complete a pass. First thing I did was pulled one of my two memory sticks, then retested and what do you know, no BSOD's for 12 hours!

To test the DIMM's on the motherboard I inserted my known healthy RAM module into the slot where bad module came from and retested, everything was just fine after extensive testing. If it had been a failure then I would have identified as defective DIMM, it's best to eliminate the RAM first because it the easiest and quickest component to in the process of elimination.

I truly hope it's just a RAM setting!
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post #6 of 56
Sorry I can't help you out but I can't resist this; WOW YOU HAVE 64GB OF RAM drool.gif lol that is epic man I hope you get it sorted out.
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post #7 of 56
Quote:
Originally Posted by EpicAMDGamer View Post

Sorry I can't help you out but I can't resist this; WOW YOU HAVE 64GB OF RAM drool.gif lol that is epic man I hope you get it sorted out.
I must have missed that part about having 64GB of RAM, in that case you'll need to increase the voltage when running that much memory because you have memory modules to feed!
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post #8 of 56
From personnal experience, I've seen memory errors occur as little as once every 3 passes. I don't have electronics knowledge I wouldn't be able to explain why. Though I did BS a few customers because the store I work for hires "experts" ... not really.
I think Electrocutor has the best suggestion for the whole kit, but first try and see if you can get one of your good stick passing in every DIMM. Try afterwards to retest the bad sticks at the default, non XMP values to get a clearer baseline afterwards you would have to find the proper OC settings for your RAM.

Hope your hardware is not defective.
post #9 of 56
Thread Starter 
Ugh. I let one of my two "good" sticks run longer, and it ended up showing lots of errors in the 3rd pass....about 2 hours into the test. I'm convinced that my one remaining stick of "good" ram would show errors if I let it run long enough. I haven't messed with any voltages or timings yet.

If every single one of the 8 sticks has errors....that would be quite the coincidence. I'm going to let one run for a few hours tonight in slot B-1, ...instead of slot A-1 I've been testing in. Will see what happens there.

After that, I'll revert to the SPD settings, which set the frequency at 1,333....but the timings were a little tighter than the XMP settings.

No way all 8 sticks of new Corsair memory are bad....right? Got to be something else.
post #10 of 56
Thread Starter 
Open to any other ideas for troubleshooting or testing. I don't think the idea that having 64GB of memory is causing the problems makes sense....since I'm using just a single stick at a time to test for errors.
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