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*Official* Intel DDR4 24/7 Memory Stability Thread - Page 203

post #2021 of 5758
Quote:
Originally Posted by lilchronic View Post

Got a screen shot of what timing's you are running?

last time i tried 3200Mhz cl13 i only went up to 1.420v because i like that number biggrin.gif passed gsat for 1 hour but in HCI i got a error @ 650%

Honestly i dont think im even going to try hci this time as i couldent get gsat stable for 2 hours until i made it up to 1.45vdimm, i think that should be enough.

I'm running default timings unfortunately. Tried to go 1.44 and I get error on HCI memtest.
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post #2022 of 5758
Quote:
Originally Posted by greg1184 View Post

I'm running default timings unfortunately. Tried to go 1.44 and I get error on HCI memtest.

Try your primary's at 13-13-13-1T , TWR=10 , TRRD=4 , TCWL=9, TFAW=16 with every thing else on auto. Start there, if you can pass that then start tightening the one's left on auto.

........Or start with cl13-13-13-1t and every thing else on auto. once you pass then move on to the above. thumb.gif


my memory overclock has taken me months of slowly lowering timings and testing. tongue.gif
Edited by lilchronic - 7/14/16 at 5:48pm
post #2023 of 5758
Quote:
Originally Posted by Blameless View Post

and you broke Memtweakit Efficiency score. wink.gif

Memtweakit detects the wrong memory clock on my setup.
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.
thanks for the link... we've been told that putting your PC to sleep can also reveal signal loss over time. Just poking around to see if there is a "simple" way to get at this issue. Apparently there is not. thumb.gif
Quote:
Originally Posted by djgar View Post

Wait! Here's my new one thumb.gif
Hmmm, not sure what you mean by "dram clock" ... and thanks again!
Here's my last tweak ...
Warning: Spoiler! (Click to show)
Should have added 80 minutes GSAT passed.
so in the ram timings menu (rog boards for sure) down where "Eventual Dram Voltage" can be entered, there should be a field for Dram Clock Period. Auto is fine... ROG presets use 13 on x99 and 24 on z170.
Quote:
Originally Posted by H3avyM3tal View Post

Not familiar with those, will check them out. Thanks for the heads up.
haswell-e and broadwell-e. no reason to use p95 on these cpus (really). x264, realbench, HCi memtest etc are much better.
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.


Tight! blinksmiley.gif
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post #2024 of 5758
Quote:
Originally Posted by lilchronic View Post

Try your primary's at 13-13-13-1T , TWR=10 , TRRD=4 , TCWL=9, TFAW=16 with every thing else on auto. Start there, if you can pass that then start tightening the one's left on auto.

What I do is set everything on Auto in timings with XMP enabled and the timings at what I know work, for me, 8x4GB G.Skill 3000 at 3200MHZ , 15-16-16-35 1T. Then I set tRTP to 5, tFAW 20, DRAM Refresh Interval (tREFI) to 22066, and DRAM Ref Cycle Time (tRFC) at 279,everything else left on Auto, these I know work for me. Make sure you figured out optimal memory voltages and SA voltages etc. as well.

I then put the RAM speed in BIOS at 2400 instead of 3200, reboot, set the secondary timings as they show on XMP manually, just the first main page of timings in the BIOS like I'm showing in MemTweakIt in one of the Spoiler pictures. Put RAM speed back to 3200, boot into Windows, run HCI MemTest or GSAT if you want. If stable, great, keep settings, if not do same thing with lower RAM speed up one notch, then reset the timings manually again, or if your stable try one notch lower and see if you're still stable. drum.gif

I get really great benchmarks this way having the tightest secondary timings I can get away with. smile.gif

I do have a really great CPU however which helps a ton. biggrin.gif

Edit: You might also want to manually set like the picture below below before lowering memory speed in BIOS to 5-5-5-1, on XMP they may be too low when you manually set it and go back to the higher speed and PC won't boot.



Warning: Spoiler! (Click to show)





Edited by KedarWolf - 7/14/16 at 6:23pm
    
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post #2025 of 5758
Quote:
Originally Posted by KedarWolf View Post

What I do is set everything on Auto in timings with XMP enabled and the timings at what I know work, for me, 8x4GB G.Skill 3000 at 3200MHZ , 15-16-16-35 1T. Then I set tRTP to 5, tFAW 20, DRAM Refresh Interval (tREFI) to 22066, and DRAM Ref Cycle Time (tRFC) at 279,everything else left on Auto, these I know work for me. Make sure you figured out optimal memory voltages and SA voltages etc. as well.

I then put the RAM speed in BIOS at 2400 instead of 3200, reboot, set the secondary timings as they show on XMP manually, just the first main page of timings in the BIOS like I'm showing in MemTweakIt in one of the Spoiler pictures. Put RAM speed back to 3200, boot into Windows, run HCI MemTest or GSAT if you want. If stable, great, keep settings, if not do same thing with lower RAM speed up one notch, then reset the timings manually again, or if your stable try one notch lower and see if you're still stable. drum.gif

I get really great benchmarks this way having the tightest secondary timings I can get away with. smile.gif

I do have a really great CPU however which helps a ton. biggrin.gif

Edit: You might also want to manually set like the picture below below before lowering memory speed in BIOS to 5-5-5-1, on XMP they may be too low when you manually set it and go back to the higher speed and PC won't boot.



Warning: Spoiler! (Click to show)





What are your RTL timings? Doing it through this work flow seems like they will really be thrown off.
post #2026 of 5758
Quote:
Originally Posted by superkyle1721 View Post

What are your RTL timings? Doing it through this work flow seems like they will really be thrown off.

I don't manually set RTL, leave it on XMP on Auto, just main sub timings I change. thumb.gif

Edit:

Manually set these at the XMP 2400 settings on reboot in BIOS except what I already mentioned I set manually beforehand.






These below I don't change. Leave them on Auto in BIOS.



Edited by KedarWolf - 7/14/16 at 7:11pm
    
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post #2027 of 5758
Quote:
Originally Posted by KedarWolf View Post

I don't manually set RTL, leave it on XMP, just main sub timings. thumb.gif

Hello

You are manually setting CL and leaving tWCL set to auto correct? If so as RTL/IOL are mainly influenced by CL and tWCL I don't see any issue here.
post #2028 of 5758
Quote:
Originally Posted by Praz View Post

Hello

You are manually setting CL and leaving tWCL set to auto correct? If so as RTL/IOL are mainly influenced by CL and tWCL I don't see any issue here.

Ah thanks for the clarification on this. I was under the impression RTL was altered by CL and or clock speed. Apologies...carry on!!
post #2029 of 5758
Quote:
Originally Posted by superkyle1721 View Post

Ah thanks for the clarification on this. I was under the impression RTL was altered by CL and or clock speed. Apologies...carry on!!

Hello

@KedarWolf is manually setting CL as well as the desired memory speed. tWCL is on auto which will scale with the manually set CL value. The RTL and IOL values will be set based on these values not the remaining settings being input manually.
post #2030 of 5758
Quote:
Originally Posted by Praz View Post

Hello

You are manually setting CL and leaving tWCL set to auto correct? If so as RTL/IOL are mainly influenced by CL and tWCL I don't see any issue here.

I manually set these minus what I said I manually set before booting into 2400 XMP.

RTL IO Control and IO Control I don't manually set.
Warning: Spoiler! (Click to show)





This is my benchmark.

    
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