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*Official* Intel DDR4 24/7 Memory Stability Thread - Page 202

post #2011 of 6333
Quote:
Originally Posted by Jpmboy View Post

lol - Mr. Overkill (6 hours GSAT). thumb.gif

and you broke Memtweakit Efficiency score. wink.gif

Memtweakit detects the wrong memory clock on my setup.
Quote:
Originally Posted by Jpmboy View Post

edit: hey, if you are soo inclined, I've been trying to assess the impact of high refresh interval using ram disk as basically a low activity memory block... only tested at 22066 for a week, but did not loose any "fidelity". Care to try a small ram disk? Or do you know of a way to get at signal loss at these high intervals?

I'm not sure how useful a small RAMdrive is as the average retention time of a DRAM cell is vastly higher than the retention time of the weakest portion of cells, but refresh intervals need to be set around the weakest links. Testing only a small segment of memory at a time, especially when you have no real way to control what physical addresses are being used, makes it easy to miss potentially problem areas.

Currently I use Memtest86 4.3.7's bit fade test, which repeatedly fills, sleeps, then reads the memory. The versions of this test that work on my system only have a cycle time of 5 minutes, but since the memory is refreshed at least every several dozen ms, most infrequent scenario, enough loops should still be good at detecting idle errors. Also, since the test is low load, I can shut off all of my case fans to simulate worst case scenario ambient temperatures in the vicinity of the DIMMs without causing the CPU or other components to overheat.

Load errors are more problematic. Ideally, I'd like to see a modern bootable row hammer test that takes recent discoveries into account. Newer versions of Memtest86 (vanilla) have a row hammer test, but it's not tuned for DDR4. The problem with the newer EFI versions of Memtest86 is that compatibility is poor in newer systems (including my own) and they reserve a lot more memory than the legacy tests. Why they can't have a legacy version that incorporates the new tests is beyond me.

Maybe the answer is an ultra light Linux build and a javascript rowhammer attack?

A paper I was skimming: http://arxiv.org/pdf/1507.06955v5 - page 16 has them successfully performing the attack on a Skylake DDR4 system.

Building a memory test is well beyond my abilities, but maybe someone could write a program to analyze a system for the most effective attack pattern, then run the patter and report the rate of flips to allow comparison at different TREFI settings. The right pattern should produce errors on almost anything, but the rate would still allow an informed decision of what trade offs to make and what interval to set.
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post #2012 of 6333
Thread Starter 
Thanks for all the entries, folks. Just doing one of my own and i'll update.
post #2013 of 6333
Quote:
Originally Posted by Silent Scone View Post

Thanks for all the entries, folks. Just doing one of my own and i'll update.

Wait! Here's my new one thumb.gif
Quote:
Originally Posted by Jpmboy View Post

Nice! thumb.gif
tRAS seems to be tolerant of a -2 vs the calc min window... maybe Intel has applied an offset in the microcode?
noiw gewt in there and set the dram clock to 13, and lower the three timings I flagged below until stability or "productivity" is lost. Some kits can run these at the same value... some work best with a stagger.
Warning: Spoiler! (Click to show)

Hmmm, not sure what you mean by "dram clock" ... and thanks again!

Here's my last tweak ...



Should have added 80 minutes GSAT passed.
Edited by djgar - 7/14/16 at 12:26pm
post #2014 of 6333
Found the 90 minute bit fade test I was originally looking for; it's part of Memtest86 3.x and Memtest86+ 4.x. Running Memtest86+ 4.2 now.

Test takes three hours per loop and unlike the ten minute test in later versions, it idles the memory for 90 minutes per pattern. Only reserves 12MB of memory on my system as well, which is way less than the later versions of Memtest86/86+.

Now all I need is a good row hammer test.
Edited by Blameless - 7/14/16 at 12:24pm
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post #2015 of 6333
Quote:
Originally Posted by Jpmboy View Post

lesson learned.. stay away from p95 with HWE or BWE. smile.gif

Not familiar with those, will check them out. Thanks for the heads up.
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post #2016 of 6333
Hi.

Struggeling with DDR4 OCing.

I have Corsair Dominator Platinum 3333mhz 16-18-18-36 RAM. 4x8gb dimms.

CPU: 6850K
MOBO: Rampage V10


So far, I have only been able to get them to 3200mhz, and to acheive this, I have 1,46v, +410 offset on the system Agent, and 1,2v VCCIO CPU.
Best of all, it still isn't 100% stable.


This seems pretty terrible to me. Any pointers?
Edited by CerN - 7/14/16 at 3:26pm
post #2017 of 6333
Thread Starter 
This is definitely all I can squeeze out of this kit personally, although I'm fairly happy with the outcome. Although might be able to drop tWCL to 11.


Edited by Silent Scone - 7/14/16 at 3:44pm
post #2018 of 6333
Quote:
Originally Posted by Silent Scone View Post

This is definitely all I can squeeze out of this kit personally, although I'm fairly happy with the outcome. Although might be able to drop tWCL to 11.


I was always told to set tWCL to say 9 before adjusting any other secondary or tertiary timings and that this would result in better performance than the rest. I'm a noob in the OCing ram world however so take this with a grain of salt. I am curious on your opinion of this though...
post #2019 of 6333
Thread Starter 
Write latency at 9 on that particular configuration is likely outside of the capability of the sticks
post #2020 of 6333
Hm... So my RAM apparantely hated the ROG Tweak "AUTO" setting, under DRAM timings. I set it to 1, and now I am currently stability-testing at 3400mhz, with lower voltage settings from before, when I couldn't even get it stable at 3200mhz.
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