*Official* Intel DDR4 24/7 Memory Stability Thread - Page 1152 - Overclock.net - An Overclocking Community
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*Official* Intel DDR4 24/7 Memory Stability Thread

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post #11511 of 11607 (permalink) Old 02-14-2020, 04:58 PM
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Quote: Originally Posted by sword fan View Post
Still looking for advice on MCH FUll Check ...if I have MCH disabled but aslo have MRC fast boot disabled does that train the memory enough if the ram is stable in every stress test I run for many hours (HCI, GSAT, MT86, OCCT lare)? Even with much looser timings and much more voltage I can't even get 3800 15-16-16-38 stable for more than a couple passes of the previous tests with MCH enabled where as its stable for 4000% HCI, 5 hrs GSAT, 8 passes MT86 and 10 hours of OCCT large with it disabled.
I run MCH Full Check Disabled for 4200-17-17-17-36-1T and it's pretty solid. RTLs, IO-Ls and IOL Offsets are set manually once the optimum is found so there's not a lot to train

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post #11512 of 11607 (permalink) Old 02-14-2020, 05:38 PM
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Quote: Originally Posted by kamyk155 View Post
Guys - can you give me somekind of good starting point with OC my memory ?
4x8GB Patriot Viper Steel (b-die) 4000MHz XMP - 19-19-19-39-700-2T.
For now I'm using XMP profile but with manual - 1,41V 18-18-18-39-700-2T looks stable.
People told me that I have low LinX GFLOPS score - about 470GFLOPS now.
If you have used XMP you should really clear cmos before starting ram tuning.
Save your current profile to a usb in case you get frustrated and want to revert. I assume you have a recent bios?
Follow the instructions at the start of this thread and get familiar with your bios. You can't really shortcut the process too much.
Simple things like bringing down the tRFC to about 400 will make a big difference to your ram performance but only after following the other steps

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post #11513 of 11607 (permalink) Old 02-14-2020, 06:57 PM
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Quote: Originally Posted by reachthesky View Post
Could someone please tell me which one of these configurations would be better in theory. Reason I ask is if I go 16 tCWL instead of 18 i cannot run tRDWR at 12 and trfc at 336. Is it more important for me to priorize tCWL even it means other timings aren't as tight as they could be? How important is tCWL in general and does it have any specific impact in gaming? Not sure which profile to use basically.
Theory is just that... the best way to answer your question is to measure performance. In addition to AID64 memBench, simple things like SuperPi 32M, any of the chess benchmarks, gaming benchmarks and SiSoft memory benchmarks will tell you what you need to know.
Quote: Originally Posted by sword fan View Post
Still looking for advice on MCH FUll Check ...if I have MCH disabled but aslo have MRC fast boot disabled does that train the memory enough if the ram is stable in every stress test I run for many hours (HCI, GSAT, MT86, OCCT lare)? Even with much looser timings and much more voltage I can't even get 3800 15-16-16-38 stable for more than a couple passes of the previous tests with MCH enabled where as its stable for 4000% HCI, 5 hrs GSAT, 8 passes MT86 and 10 hours of OCCT large with it disabled.
once you have solid manual settings, INcluding RTLs as Munternet says below, you can disable training. The risk is really confined to the remaining margins around the timings and alignment to deal with any drift down the road.
Quote: Originally Posted by munternet View Post
I run MCH Full Check Disabled for 4200-17-17-17-36-1T and it's pretty solid. RTLs, IO-Ls and IOL Offsets are set manually once the optimum is found so there's not a lot to train
^^ this

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post #11514 of 11607 (permalink) Old 02-14-2020, 09:33 PM
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Munternet and Jpmboy, thank you very much for the info guys, much appreciated!
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post #11515 of 11607 (permalink) Old 02-15-2020, 10:10 AM
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Quote: Originally Posted by Jpmboy View Post
Are you attempting this change in frequency based upon loading XMP then simply increasing the freq? If yes, that's probably not a good route to go.
If you are looking for gaming performance, focus on improving Latency. Actually, look to improve system latency which you can monitor with Latency Monitor.
Ah, I kind of see where you’re going.

I had XMP enabled and was able to get stable with setting manual 1.35 vdimm with 280 tRFC. Tried to adjust to 260 tRFC but it kept on booting with 280.

Disabled XMP and set manual frequency, primaries, VCCIO, VCCSA, vdimm, and training voltage and it booted with my manually set 260 tRFC. Running memtest HCI right now.

Does XMP enabled mess with the stability of manual memory overclocks? I’m not entirely sure why it refuses to acknowledge certain manually input settings.
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post #11516 of 11607 (permalink) Old 02-15-2020, 10:30 AM
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Unrelated. I’m running 8 instance of memtest HCI right now for each of the 8 cores on my 9700k. 16gb system ram, testing only 13200mb, 1650mb per instance.

Usually they all run at similar speeds. Once I noticed one running a bit slower than the others. Now I have like half of them running much faster than the others.

I even used ISLC to clear my standby list before running the memtest and I’m still seeing similar behavior.

I have an all core overclock of 5.0, so I’m confounded why some instances are running slower than others.
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post #11517 of 11607 (permalink) Old 02-15-2020, 10:56 AM
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Quote: Originally Posted by KrampusKlaus View Post
Unrelated. I’m running 8 instance of memtest HCI right now for each of the 8 cores on my 9700k. 16gb system ram, testing only 13200mb, 1650mb per instance.

Usually they all run at similar speeds. Once I noticed one running a bit slower than the others. Now I have like half of them running much faster than the others.

I even used ISLC to clear my standby list before running the memtest and I’m still seeing similar behavior.

I have an all core overclock of 5.0, so I’m confounded why some instances are running slower than others.
Probably the page file. I used to run 1150 mb per instance on my 12 threads (8700k w/ 16gb) and in hwinfo I'd get a max page file usage of 2.5-3% and several of my instances would fall behind the others by 100-200%. Now I run 1000 mb per instance and at most I'll get 0.3-0.5% page file usage and my instance percentages stay much closer together. As I understand it, even if you don't test so close to your max amount of ram, it'll still all get tested eventually.
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post #11518 of 11607 (permalink) Old 02-15-2020, 11:19 AM
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Yeah idk *** was going on but I restarted the test a few times with the same amount of memory tested and now all 8 instances are running relatively similarly.
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post #11519 of 11607 (permalink) Old 02-15-2020, 02:34 PM
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Quote: Originally Posted by KrampusKlaus View Post
Yeah idk *** was going on but I restarted the test a few times with the same amount of memory tested and now all 8 instances are running relatively similarly.
Could depend on what windows is doing in the background.
tRFC seems plenty low at 280.

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post #11520 of 11607 (permalink) Old 02-16-2020, 02:16 AM
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My memory OC that was rock stable for months suddenly whas no that much stable under heavy stress tests for a few weeks...

After trying to recover this by increasing voltages I went back to the stable configuration and just made a cleaning of the memory sticks contacts with Ether and all is back to normal !!!

Even if the weather is not that much wet here in Switzerland (even not cold at all this year but this is an other story...) I suspect a very thin layer of oxidation appeared on the memory stick contacts that made my previously stable config a bit unstable.

Should you have this kind of experience (or also possibly to improve you memory OC!) try this very easy trick.

Note the very same applies to GPU/PCI (on the GPU side) and CPU/MB contacts (on the CPU side of course!).

Give a try and report back.
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