NEW!!! DRAM Calculator for Ryzen™ 1.5.1 (overclocking DRAM on AM4) + MEMbench 0.7 (DRAM bench) - Page 220 - Overclock.net - An Overclocking Community

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NEW!!! DRAM Calculator for Ryzen™ 1.5.1 (overclocking DRAM on AM4) + MEMbench 0.7 (DRAM bench)

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post #2191 of 4616 (permalink) Old 07-14-2018, 03:34 AM - Thread Starter
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Quote: Originally Posted by Nighthog View Post
Good for you, you clearly have a better memory kit/cpu/motherboard.
It takes time to get it right at the faster speeds. So much tweaking, took me ages to get it stable at that speed for myself.
Had to pester about in 3733 and 3800Mhz to find what was more stable in those and then go back to test those in the lower straps to improve stability there.

I can hint it was tRRDS/tRRDL and tWTRS/tWTRL that needed to find their "best" values. Either too low or too high caused issues. It wanted to have it at specific values for best results.

I think you might be able to handle 3733+ if you go a little off the safe path on SoC voltage if the InfintyFabric can handle it. You have a 2700X right? I haven't seen people try push the limits on SoC and memory speeds fully in the extreme yet on those.
You clearly don't need the same amounts of SoC voltage as on Ryzen Gen1. I need ~1.244V SoC for 3666Mhz on mine R7 1700.
I think SOC 1.1 volts for 3666 is still redundant (the actual frequency of Infinity is 2 times lower), the main problem is the entire line's impedance. Too large or too low a resistance provokes jitter, which you can not fix by timings (except for the tCKE constraint). I think 4000 MHz for memory is not a problem.

I agree with you that these 4 timings can influence the situation, but in my research other timings play a much larger role (tRCDRD, tRDWR, tWRRD, tRTP)

Did you try to get 3466 on your memory?

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Last edited by 1usmus; 07-14-2018 at 03:38 AM.
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post #2192 of 4616 (permalink) Old 07-14-2018, 05:16 AM
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I see your DIMM temps going over 49c. Is this safe?
What should be ideal temp? I see around 43c max @ 1.4250V

Managed to set my F4-3600C15D at 3400 14-14-14-14-28-42 @ 1.4v SOC 1.0250
But had to disable GDM and select Cmd 2T to make is stable. This setting also gives me lowest latency of 62.0ns.

So for a Ryzen system - Should the main objective is to get the lowest latency possible? Should that be the main objective of RAM tweaking?
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post #2193 of 4616 (permalink) Old 07-14-2018, 06:17 AM
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I have like this now, and it's fully stable.
I just can't go with 3200 and on 3080 i can't have CL15 1T only 2T (Latency is ~75ns)
FSB 105 so it's 3079MHz

Any sugestions Bratan' what i can achieve?
G-Skill RipJawsV 3200 CL 16-16-16-16
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post #2194 of 4616 (permalink) Old 07-14-2018, 07:01 AM - Thread Starter
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Quote: Originally Posted by imsyB View Post
I see your DIMM temps going over 49c. Is this safe?
What should be ideal temp? I see around 43c max @ 1.4250V

Managed to set my F4-3600C15D at 3400 14-14-14-14-28-42 @ 1.4v SOC 1.0250
But had to disable GDM and select Cmd 2T to make is stable. This setting also gives me lowest latency of 62.0ns.

So for a Ryzen system - Should the main objective is to get the lowest latency possible? Should that be the main objective of RAM tweaking?

Up to 52 degrees, the system will be stable. Dangerous temperature 70+ degrees

Command rate (CR) - the amount of time, in cycles, between when a DRAM chip is selected and a command is executed. 2T CR can be very beneficial for stability with high memory clocks, or for 4-DIMM configurations.
The best option I think is 1T

Special for u

DRAM 1.41
SOC 1.025

Spoiler!



Quote: Originally Posted by Ne01 OnnA View Post
I have like this now, and it's fully stable.
I just can't go with 3200 and on 3080 i can't have CL15 1T only 2T (Latency is ~75ns)
FSB 105 so it's 3079MHz

Any sugestions Bratan' what i can achieve?
G-Skill RipJawsV 3200 CL 16-16-16-16
Spoiler!

Stand#1 Ryzen Threadripper 2990WX + Liqtech 240 * MSI MEG X399 CREATION * G.Skill [email protected] * Sapphire Vega 64 NITRO+ * Corsair HX750i * Samsung 960 PRO * Benq BL3201PT
Stand#2 Ryzen 2700X + NZXT Kraken x62 * MSI X470 Gaming M7 AC * G.Skill [email protected]3666CL14 * MSI GTX 1080 Ti GAMING X * Corsair HX750i * Samsung 970 PRO
DRAM Calculator for Ryzen™ 1.5.1 by me + TM 5 0.12 1usmus config v3 (memory test)
How to update BIOS correctly + Unlocked AMD_CBS for Ryzen motherboard

Last edited by 1usmus; 07-14-2018 at 07:07 AM.
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post #2195 of 4616 (permalink) Old 07-14-2018, 09:08 AM
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Hmm, here is mine:
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post #2196 of 4616 (permalink) Old 07-14-2018, 10:45 AM
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@1usmus , Could you take a look at my try to get 3466mhz, cas 14, at Agesa 1.0.0.4? what do you think? It was stable at Agesa 1.0.0.2.

https://www.overclock.net/forum/27536422-post3933.html

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post #2197 of 4616 (permalink) Old 07-14-2018, 11:00 AM
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Quote: Originally Posted by 1usmus View Post
I think SOC 1.1 volts for 3666 is still redundant (the actual frequency of Infinity is 2 times lower), the main problem is the entire line's impedance. Too large or too low a resistance provokes jitter, which you can not fix by timings (except for the tCKE constraint). I think 4000 MHz for memory is not a problem.

I agree with you that these 4 timings can influence the situation, but in my research other timings play a much larger role (tRCDRD, tRDWR, tWRRD, tRTP)

Did you try to get 3466 on your memory?
3466Mhz is stock XMP on these and it works without issue, though it goes CL20 rather than the CL19 it should. (both the micron B-die and E-die works without issues @ stock/XMP 1.200Vmem)
The only thing that requires the high voltage(~1.500) is really if you want to use CL14 or tRDRDSCL/tWRWRSCL @ 2 at the high speeds... if you use CL16 or xxxxSCL 4 etc you can use much lower voltages.
I had 3600 working with around ~1.330V with some relaxed timings in the beginning, like 18.21.20.40.78 [email protected] etc.

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post #2198 of 4616 (permalink) Old 07-14-2018, 01:28 PM
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I can post all day long at 3533 and 3600, but I just can't find the right recipe to resolve memory test errors.

Ryzen 7 2700X
2x8GB Gskill 3600C15
Crosshair VII

I've swept up and down SoC from 0.9V to 1.1V

Up and down VDIMM from 1.35 to 1.45V

All sorts of CAD_Bus settings (24-24-24-24, 30-30-30-30, 40-40-40-40, 40-40-60-60, 30-30-40-60, 20-20-20-20)

All sorts of RTT Settings (Nom OFF, Wr OFF, 48/60 Park seems to work best for POST)

ProcODT 60 seems to be the sweet spot for POST

I just can't figure it out. So frustrating.
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post #2199 of 4616 (permalink) Old 07-14-2018, 05:46 PM
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Quote: Originally Posted by Espenn View Post

I just can't figure it out. So frustrating.
You may want to try my settings, I think I have the same ram as yours
But its for 3400mhz.
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post #2200 of 4616 (permalink) Old 07-14-2018, 07:58 PM
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Quote: Originally Posted by Espenn View Post
I can post all day long at 3533 and 3600, but I just can't find the right recipe to resolve memory test errors.

Ryzen 7 2700X
2x8GB Gskill 3600C15
Crosshair VII

I've swept up and down SoC from 0.9V to 1.1V

Up and down VDIMM from 1.35 to 1.45V

All sorts of CAD_Bus settings (24-24-24-24, 30-30-30-30, 40-40-40-40, 40-40-60-60, 30-30-40-60, 20-20-20-20)

All sorts of RTT Settings (Nom OFF, Wr OFF, 48/60 Park seems to work best for POST)

ProcODT 60 seems to be the sweet spot for POST

I just can't figure it out. So frustrating.

If you take into account the sheer number of unique combinations and factors that influence memory instability then you will wonder how you manage to even get anything stable. Say for instance you have settings that are 98% stable but anything you try causes more errors. Well, that could be bc there are several settings that could need to be changed bc changing X changes the way other settings behave causing Y to need adjusting which causes other settings to behave differently. It can be an exponential headache. Sometimes the solution is to just take a break and erase your mind of the memory settings and in a week or so youll have an idea that pops into your head so you try it and it doesnt lead anywhere. So, you chill for a bit longer playing games or whatever it is that you normally do and eventually you will get a spark that will have you jumping back into memory OC with a fresh mind and less frustration. Sometimes frustration can lead us to work in a sub optimal fashion. When that happens you need to realize it and step away to refresh yourself or you will eventually get angry and no one makes good decisions when they are that frustrated. I stepped away for a couple weeks and started messing around on HWBOT.org to take my mind off of it and after a couple weeks I got an idea that lead me to get 3600 damn near stable then with a bit of work its stable but I couldnt for the life of me see the solution bc I was frustrated with the errors.



Also, what @1usmus says about impedance is 100% true. Resistance, in my opinion is probably the single largest factor in Ryzen memory stability. If those settings arent perfectly optimized then it decides your frequency ceiling and no amount of voltage will change that. Especially at higher frequencies where the margin of error is tiny, one wrong setting whether it be in Cad_Bus, rtt, procODT, etc will screw the whole thing up. just those 3 areas have around 8 different things you can adjust with about 6-10 different adjustments for each one so you can see how it would take a massive amount of time and also recording everything down in notes and probably a bit of luck to be able to find the right settings. Thats not even counting all the other settings, voltages, timings that have an ever reducing margin for error as the frequencies get higher. At some point you just have to realize that you need to relax and wait for the bios to mature or calm down and dig back into it. Dont let yourself get frustrated for too long as you cant blame yourself for not getting those higher frequencies stable at this point. Statistics are literally against you and just getting them near stable is a mathematical feat of skill or luck...probably a bit of both.

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