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Ryzen DRAM Calculator by 1usmus

user556

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Just wanted to say thanks to 1usmus for all the articles on DRAM overclocking in general. For the first time in many attempts over the years I've managed to get a reliable improvement. :) It wasn't much in the end - raising from the GSkill Trident F42800C14D-32GTZ XMP settings of 2800 MHz to 2933 then only tweaking the two SCL values and I got an improved result.

I suspect the DIMMs I've got are quad ranked (ProcODT of 80 ohms worked best when I tried it) so doesn't appear happy going much faster than XMP. I could get to 3066 MHz but had to also relax the main CL values so any benefit vanished. Like you say, trying the combinations, documenting the changes, and testing each change carefully is the only way.

PS: CPU is Ryzen 1700X in Asus Prime B350-PLUS mobo with BIOS 5407. Almost three years old now.
 
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Tey

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Running a 3800x with 2x16Go Gskill 3600C16-19-19-19-39 (Hynix DJR) on asus B450 Strix.
I run DOCP with lowered Fq at 3460C16 1:1 so 1730Mhz IF (because I have small instability at 3600c16), I suspect the IF.

With everything else on auto, my mb set VSOC to 1.1v, VDDG to 1.097 VDDP 0.900.
It seems pretty Hight for the VDDG, so I tried to lower this one at 1.0v: Errors on Karhu around 1000% coverage so I tried 1.05v: still errors on karhu around 1000% (no errors with VSOC VDDG on auto).
I read that VDDG should stay low and around 950/1000mv, but it seems my IF need a hight VDDG to run stable, any advice ?

After a deeper look it seems that my mobo don’t set a VSOC of 1.1 but around 1.08/09 and VDDG 1.097.. Lol.
Pretty strange because I read that VDDG cannot be higher than VSOC ??
 
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i have B450 Tomahawk max but not FLCK in bios...why?
r5 2600 cpu
 
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Unable to get anything working. Closest I got was running the safe preset for 3600MHz at 3266MHz, that works fine. I can lower CL to 14 and tRFC to 500. Even with really lax timings nothing past 3266 will post. Tried voltage from 1.35 to 1.45, changed the pro-value from 32, 34, 36, 40. Tried cr 2. No post. Used xmp from typhoon burner, 3266 safe wont post. Currently running 3266 14-20-16-36, tfaw 24, tRFC 500, CR 1, gdm on.

Current setup is:
R5 3600
ASUS Tuf B450m gaming plus (latest bios)
Micron E-die 3000cl15 Ballistix

Good airflow and low temps (cpu idles at below 35C, and below 65C during multiple CB15 runs).

Any advice? Maybe some timing etc which affects ability to boot a lot?
 
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Unable to get anything working. Closest I got was running the safe preset for 3600MHz at 3266MHz, that works fine. I can lower CL to 14 and tRFC to 500. Even with really lax timings nothing past 3266 will post. Tried voltage from 1.35 to 1.45, changed the pro-value from 32, 34, 36, 40. Tried cr 2. No post. Used xmp from typhoon burner, 3266 safe wont post. Currently running 3266 14-20-16-36, tfaw 24, tRFC 500, CR 1, gdm on.

Current setup is:
R5 3600
ASUS Tuf B450m gaming plus (latest bios)
Micron E-die 3000cl15 Ballistix

Good airflow and low temps (cpu idles at below 35C, and below 65C during multiple CB15 runs).

Any advice? Maybe some timing etc which affects ability to boot a lot?
You CAS is too low and the tRFC might be too tight as well, try increasing those if you want higher clocks.
Your RAM isn't exactly fast to start with, so 3266MHz seems like a reasonable overclock.
 
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Unable to get anything working. Closest I got was running the safe preset for 3600MHz at 3266MHz, that works fine. I can lower CL to 14 and tRFC to 500. Even with really lax timings nothing past 3266 will post. Tried voltage from 1.35 to 1.45, changed the pro-value from 32, 34, 36, 40. Tried cr 2. No post. Used xmp from typhoon burner, 3266 safe wont post. Currently running 3266 14-20-16-36, tfaw 24, tRFC 500, CR 1, gdm on.

Current setup is:
R5 3600
ASUS Tuf B450m gaming plus (latest bios)
Micron E-die 3000cl15 Ballistix

Good airflow and low temps (cpu idles at below 35C, and below 65C during multiple CB15 runs).

Any advice? Maybe some timing etc which affects ability to boot a lot?
Is your RAM kit 2 or 4 sticks? And 1 or 2 ranks each stick?
 
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You CAS is too low and the tRFC might be too tight as well, try increasing those if you want higher clocks.
Your RAM isn't exactly fast to start with, so 3266MHz seems like a reasonable overclock.
I have tried 630 tRFC, 18 cas, laxed several other timings, won't post.

My ram is 2x8 mb sr.

Tested with 1.3V at that is perfectly stable with the 3266 14-20-16-36 setup.

Is your RAM kit 2 or 4 sticks? And 1 or 2 ranks each stick?
2x8 sr. Kit of 2.
 
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I have tried 630 tRFC, 18 cas, laxed several other timings, won't post.

My ram is 2x8 mb sr.

Tested with 1.3V at that is perfectly stable with the 3266 14-20-16-36 setup.


2x8 sr. Kit of 2.
I would seem you've hit the limits of that RAM then. Sometimes you simply hit a hard limit.
 
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I have tried 630 tRFC, 18 cas, laxed several other timings, won't post.

My ram is 2x8 mb sr.

Tested with 1.3V at that is perfectly stable with the 3266 14-20-16-36 setup.


2x8 sr. Kit of 2.
I assume its 1ranked and not 2ranked, by the 8GB per stick...

Did you try all of settings on the calculator?
Notice that you will have to adjust InfinitiFabric and UCLK voltages too for high speeds... Keep XMP profile off and start with only primary timings (5 first in BIOS) and tRFCs. Everything else (timings) on auto.


Do you get these values?

Safe V2 preset:
1584279777922.png

Fast V2 preset:
1584279722326.png

Safe V1 preset:
1584279114869.png

Fast V1 preset:
1584279292033.png
 
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Yes, single rank. Yeah, I changed all timing according to safe, tried both V1 and V2, the safe V1 from 3600 works with 3266, and from there I can lower tRFC, voltage and cl a lot without instability.

3333mhz actually posted once at really lax timings, but never posted after. I can try setting all to auto and only change the 5 timings you mentioned :)
 
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You need much more than 1,3V for RAM to allow tight timings. At least 1,375. My 5c.
 
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You need much more than 1,3V for RAM to allow tight timings. At least 1,375. My 5c.
I know that, just pointed out that voltage reqs for my best setting is very low. As said earlier, I have tried anything from 1.3 to 1.45V, 1.3V-1.4V at 3266cl14 is perfectly stable, 3333 or higher with cl16+ and 1.35-1.45V won't boot.
 
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Did you try increasing SOC voltage and UCLK/FCLK voltages also?
CPU SOC: 1.1V
cLDO VDDP: 1000mV (1.0V)
cLDO VDDG: 1000mV (1.0V)

What are the current voltages now?

Look for "SoC Voltage SVI2 TFN" somewhere in the middle
001_browsing_video.png

And here for the cLDO VDDP/VDDG (blue line)
1584288485443.png
 
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Yes, single rank. Yeah, I changed all timing according to safe, tried both V1 and V2, the safe V1 from 3600 works with 3266, and from there I can lower tRFC, voltage and cl a lot without instability.

3333mhz actually posted once at really lax timings, but never posted after. I can try setting all to auto and only change the 5 timings you mentioned :)
Try this:
3600 16-19(19 tRCDRD + 16 tRCDWR)-16-36-62-620, Soc 1.1, VDDP 0.9v, VDDG 1.0v, 1.40v Dram, Spread spectrum off.

You CAS is too low and the tRFC might be too tight as well, try increasing those if you want higher clocks.
Your RAM isn't exactly fast to start with, so 3266MHz seems like a reasonable overclock.
3000 CL15 is better binned E-die that's used in my 3200 CL16. He should be able to get it to 3466, 3600 or even 3733 with some tweaking.

At least on a X570, dunno about B450 (although at least one guy on OC.co.uk got E-die stable with 3733 on a B450).
 
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Did you try increasing SOC voltage and UCLK/FCLK voltages also?
CPU SOC: 1.1V
cLDO VDDP: 1000mV (1.0V)
cLDO VDDG: 1000mV (1.0V)

What are the current voltages now?

Look for "SoC Voltage SVI2 TFN" somewhere in the middle
View attachment 148202

And here for the cLDO VDDP/VDDG (blue line)
View attachment 148203
Tried this now with 3333 16-19-16-36-62-620, others on auto. No boot. Also ram at 1.4V.

Try this:
3600 16-19(19 tRCDRD + 16 tRCDWR)-16-36-62-620, Soc 1.1, VDDP 0.9v, VDDG 1.0v, 1.40v Dram, Spread spectrum off.


3000 CL15 is better binned E-die that's used in my 3200 CL16. He should be able to get it to 3466, 3600 or even 3733 with some tweaking.

At least on a X570, dunno about B450 (although at least one guy on OC.co.uk got E-die stable with 3733 on a B450).
Tried this at 3333 and no boot. Can't find spread spectrum anywhere. Can it have another name in asus bios?
 
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Tried this at 3333 and no boot. Can't find spread spectrum anywhere. Can it have another name in asus bios?
That's a copy paste from someone else's setting. Spread spectrum might be missing on some of the ASUS boards.

Download DRAM Calc ver 1.6.0.3 and try safe settings for 3466. It should be stable. Don't forget to set the Geardown Mode to the one recommended by calc.

Big question is - are you adjusting VDDP/VDDG at all?
 
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That's a copy paste from someone else's setting. Spread spectrum might be missing on some of the ASUS boards.

Download DRAM Calc ver 1.6.0.3 and try safe settings for 3466. It should be stable. Don't forget to set the Geardown Mode to the one recommended by calc.

Big question is - are you adjusting VDDP/VDDG at all?
Yes, I set voltages to what you recommended :)
 
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That's a copy paste from someone else's setting. Spread spectrum might be missing on some of the ASUS boards.

Download DRAM Calc ver 1.6.0.3 and try safe settings for 3466. It should be stable. Don't forget to set the Geardown Mode to the one recommended by calc.

Big question is - are you adjusting VDDP/VDDG at all?
Unable to find 1.6.0.3 anywhere. Only 1.7 and some really old versions.
 
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I tried and no post. Tried same settings at 3333 and 3266, wont post. Noticed that some settings are way off from my working ones. Second timing I run at 20 instead of 18, tRC is 58 vs 78, tfaw is 24 vs 20, tWR 14 vs 24, trdwr is 10 vs 7 and tcke is 1 vs 8.

Okay, after a lot of testing I got 3600cl16 to work with 1.6.0.3. Seems like I have to enable the docp-profile to 'eraze' some hidden subtimings, then turn it off again or do a hard reset each time boot fails. Power down mode also seem to have made a difference, it was always recommended to turn iff with dram calc 1.7. Thx for the help :)

Hmm, profile keeps resetting to 3000cl15 randomly, weird...
 
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