*Official* Intel DDR4 24/7 Memory Stability Thread - Page 1043 - Overclock.net - An Overclocking Community

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*Official* Intel DDR4 24/7 Memory Stability Thread

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post #10421 of 10729 (permalink) Old 11-07-2019, 12:54 PM
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Quote: Originally Posted by Intrud3r View Post
Hmmm ... I'm tempted.
Hi,
Yep I got another set almost two weeks ago all were gone after.
Price gougers wait for newegg to run out.

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post #10422 of 10729 (permalink) Old 11-07-2019, 01:08 PM
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Quote: Originally Posted by ThrashZone View Post
Hi,
Yep I got another set almost two weeks ago all were gone after.
Price gougers wait for newegg to run out.
Just curious ...

Let's say I'll manage to get about 4200-4400 with them sticks ... compared to what I'm running now ... will it give me anything?
(higher bandwith / lower latencies ... yes, I know that )


Apart from playing with it ... which is all the fun.

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post #10423 of 10729 (permalink) Old 11-07-2019, 01:28 PM
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Quote: Originally Posted by Intrud3r View Post
Just curious ...

Let's say I'll manage to get about 4200-4400 with them sticks ... compared to what I'm running now ... will it give me anything?
(higher bandwith / lower latencies ... yes, I know that )


Apart from playing with it ... which is all the fun.
Trust me, getting 1 single error 2300% into a 9+ hour HCI test ain't fun anymore lol.

I can, again start over with my OC because of this single error. It simply isn't stable. I doubt I'll ever get a crash or WHEA error dailying the settings that generated that error but still..

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post #10424 of 10729 (permalink) Old 11-07-2019, 01:45 PM
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Quote: Originally Posted by Imprezzion View Post
Trust me, getting 1 single error 2300% into a 9+ hour HCI test ain't fun anymore lol.
lol

I have always stopped HCI at 1000%. Getting such kind of erros after more than 2000% could happen to me or to a lot of people...We all know that a "stable overclock" doesn't exist
But yes, that means you are not stable...

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post #10425 of 10729 (permalink) Old 11-07-2019, 06:42 PM
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Quote: Originally Posted by GRABibus View Post
lol

I have always stopped HCI at 1000%. Getting such kind of erros after more than 2000% could happen to me or to a lot of people...We all know that a "stable overclock" doesn't exist
But yes, that means you are not stable...
True true. I'll be a bit more realistic. I'm going to sleep now but this looks like a pretty stable base so far. I'll let it run till morning. Will probably be at like 1500% by then. CPU is down 100Mhz and cache too so that's why core volts seem a bit high because i normally run 5.1/4.8 on this and now 5/4.7 just to be 100% sure the CPU/cache don't trigger an error lol.

These SA/IO/DRAM voltages are a bit more reasonable as well compared to the super high voltages i ran on C15 4133 which i just could not get past ~200-250% without erroring.

Now, To work on the tRDWR and tWRWR as they are pretty loose still and i wanna see if tRRD_L will pull 4 as well without erroring. Most other timings including the full RTL/IO suite have been tweaked to the point of no real further improvement to be gained. Maaaybe i can squeeze out a lower tWR / tCWL but i kinda doubt it lol. Is this tRAS = tCL+tRCD+1 good like this btw or should i go to hard tCL+tRCD=33? Or even a little looser? Never really understood all the different formula's and stories about tRAS.
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post #10426 of 10729 (permalink) Old 11-07-2019, 08:14 PM
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Quote: Originally Posted by Imprezzion View Post
True true. I'll be a bit more realistic. I'm going to sleep now but this looks like a pretty stable base so far. I'll let it run till morning. Will probably be at like 1500% by then. CPU is down 100Mhz and cache too so that's why core volts seem a bit high because i normally run 5.1/4.8 on this and now 5/4.7 just to be 100% sure the CPU/cache don't trigger an error lol.

These SA/IO/DRAM voltages are a bit more reasonable as well compared to the super high voltages i ran on C15 4133 which i just could not get past ~200-250% without erroring.

Now, To work on the tRDWR and tWRWR as they are pretty loose still and i wanna see if tRRD_L will pull 4 as well without erroring. Most other timings including the full RTL/IO suite have been tweaked to the point of no real further improvement to be gained. Maaaybe i can squeeze out a lower tWR / tCWL but i kinda doubt it lol. Is this tRAS = tCL+tRCD+1 good like this btw or should i go to hard tCL+tRCD=33? Or even a little looser? Never really understood all the different formula's and stories about tRAS.
Just be sure to verify performance and not only stability. You can have a stable setting that is very inefficient due to timing clashes (eg, op windows shorter than it takes to complete the ops it is open for) RRD_L(ong) is likely not =< RRD_S(hort)
Bathroom reading for the ram addict (and links "therein"): https://www.systemverilog.io/underst...ing-parameters

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post #10427 of 10729 (permalink) Old 11-08-2019, 02:56 AM
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Quote: Originally Posted by Jpmboy View Post
Just be sure to verify performance and not only stability. You can have a stable setting that is very inefficient due to timing clashes (eg, op windows shorter than it takes to complete the ops it is open for) RRD_L(ong) is likely not =< RRD_S(hort)
Bathroom reading for the ram addict (and links "therein"): https://www.systemverilog.io/underst...ing-parameters
Interesting. This read and the one on here that goes deeper into overclocking and Target timings and such are super handy.
https://github.com/integralfx/MemTes...tening-timings

It did successfully pass 1800% (rebooted before I screenshotted it lol... Just woke up...) So after weeks and weeks of tweaking and staring angrily at the error screen I finally have a good baseline which I obviously saved in the BIOS OC profiles as well.

I can try to tweak timings from here if I ever feel like it.

EDIT: Tweaked a bunch of further timings and got my final OC for 4200Mhz.

Tested to 550% but i will let it run to 1000 just to be sure but even if it errors past 600% i don't really care lol. I feel like it's "stable enough" to probably not cause problems in daily usage.
The AIDA bench numbers are looking really really good to me lol. Even got well under 38ns

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- CPU: 5.0Ghz @ 1.30v VR VOut with 4.7Ghz cache. It daily runs 5.1Ghz 4.8Ghz cache but that is NOT Prime95 / stress tested. This is so i used that for mem testing to eliminate CPU / cache crashes.
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Last edited by Imprezzion; 11-08-2019 at 06:39 AM.
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post #10428 of 10729 (permalink) Old 11-08-2019, 08:46 AM
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I'm on the XI Apex and this might be dual rank specific (running 2x16GB B-die) but has anyone had huge issues with stability (mainly RTL training) when raising VCCIO/VCCSA? I've run GSAT to verify that my current setup is stable (1 hour) at 1.1v IO and 1.15v SA but 3800 dual-rank is a pretty tall ask for the IMC and 1.1v is to low, which I've tested with Prime95 (112k in-place non-avx). The problem is that once I bring VCCIO up above 1.2v it fails training and it shows on the RTL values. Is there any other voltage (Dram VTT?) that might stabilize this? It's been super frustrating testing every combination if VCCIO/VCCSA between 1.15-1.35v and I'm getting nowhere.


What's the safest approach to tackle this otherwise? It fails training even with really loose timings once VCCIO gets high enough to stabilize the IMC For 3800 MHz dual-rank (it seems to be near 1.325v but I can't verify this due to the training fail). I've verified that the CPU itself is stable at 1.375v (52x/49x/0avx) 0.95v VCCIO (stock RAM). I'm running the cache at stock while overclocking the RAM though which seems to be the common advice.


While the board seems great at handling 2x8GB it definitely requires a lot of manual input for 2x16GB (putting some values far to low on auto training etc.).


Edit: Attached screenshots of Timing Configurator for comparison. The first picture is with 1.15v IO 1.15v SA (~1 min stable prime95 112k non-avx), the second with 1.175v IO 1.15v SA and as you can see RTL CHA D0 is off already.
Attached Thumbnails
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ID:	305172  


Last edited by Apothysis; 11-08-2019 at 09:12 AM.
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post #10429 of 10729 (permalink) Old 11-08-2019, 09:50 AM
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Hol' up. Your tRCD and tRP are lower than your CAS? Well, there's probably your problem lol.

Try 4000Mhz 15-16-16-31-350-CR2 or 15-17-17 if it's immediately unstable. Use... I'd estimate... 1.225v SA and 1.175v IO and 1.45-1.50v DRAM? That would be a clean starting point.

Training memory is a difficult process that I don't fully understand but understand enough to know and also experience in my own process of tweaking RTL/IO that everything affects it. Not just one specific voltage or timing but rather a combination of everything together.

For example with tWR 14 tCWL 16 tWRPRE 34 my RAM will not properly train. RTL is off by at least 5 or 6. Setting it even lower at for example tWR 12 tCWL 14 tWRPRE 30 it trains fine. My RAM also tends to fail completely in locking / training if tRDWR or tWRRD is set too tight. It will run "stable" and not error per sè but have terrible performance and missed training.

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post #10430 of 10729 (permalink) Old 11-08-2019, 10:35 AM
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Quote: Originally Posted by Apothysis View Post
I'm on the XI Apex and this might be dual rank specific (running 2x16GB B-die) but has anyone had huge issues with stability (mainly RTL training) when raising VCCIO/VCCSA? I've run GSAT to verify that my current setup is stable (1 hour) at 1.1v IO and 1.15v SA but 3800 dual-rank is a pretty tall ask for the IMC and 1.1v is to low, which I've tested with Prime95 (112k in-place non-avx). The problem is that once I bring VCCIO up above 1.2v it fails training and it shows on the RTL values. Is there any other voltage (Dram VTT?) that might stabilize this? It's been super frustrating testing every combination if VCCIO/VCCSA between 1.15-1.35v and I'm getting nowhere.


What's the safest approach to tackle this otherwise? It fails training even with really loose timings once VCCIO gets high enough to stabilize the IMC For 3800 MHz dual-rank (it seems to be near 1.325v but I can't verify this due to the training fail). I've verified that the CPU itself is stable at 1.375v (52x/49x/0avx) 0.95v VCCIO (stock RAM). I'm running the cache at stock while overclocking the RAM though which seems to be the common advice.


While the board seems great at handling 2x8GB it definitely requires a lot of manual input for 2x16GB (putting some values far to low on auto training etc.).


Edit: Attached screenshots of Timing Configurator for comparison. The first picture is with 1.15v IO 1.15v SA (~1 min stable prime95 112k non-avx), the second with 1.175v IO 1.15v SA and as you can see RTL CHA D0 is off already.
You don't state what Ram kit you are using, you need to run a memory specific stability test, ie GSAT. HCI or Ramtest which I use and tests the cache as well. Also make sure you have the Mem OK Switch in the Disabled position on the mobo.

Asus Z390 Maximus XI Extreme.
Asus Z390 Maximus XI Apex.
Asus Z390 Maximus XI Hero.
Intel I9 9900K. C Stepping P0 revision.
Intel I9 9900K. (new) D Stepping R0 revision.
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