DRAM calculator for Zen 3

[brandon7171]

The calculator is just somewhat of a guide on timings you could use. You have to experiment yourself with the settings. Try the safe settings and go from there. Change one setting at a time, reboot and test and so on. IMO, most settings don't really do anything except stress the memory and the SOC. You can try my settings if you like and go from there. Always try and check AIDA64 for your memory latencies each time and the read speed benchmark. Getting the lowest timings doesn't mean anything if its not actually gaining you anything. Your SOC should be no more than 1.125 for daily.

Trfc=288, Trc=80 (can try lower), Trrds and Trrdsl=4, Tfaw=16 (Tfaw=4xTrrd), Keep twTr_s and -L at auto and Trtp at auto as well.

So could i try theses same settings on my 4x8 thermaltake ram kit, its Sk Hynix Die? Ryzen 3700X, board is crosshair VIII formula X570 just wondering.

 

[Zach_01]

Hi guys !
I'm running a Asrock X570 Taichi - Ryzen 9 5900X - 2x16 GB Trident Z RGB 3600Mhz C16

It's my first time trying to OC my memory with the DRAM calculator and I've already noticed weird behaviour. Especially in the voltage department :

View attachment 180865

Weird thing is : with standard XMP on for that kit, I have (based on Ryzen Master) :
SOC Voltage => 1.2 Volts
VDDG CCD Voltage => 1.15 Volts
VDDP => 1.1 Volts
VDDG IOD => 1.1 Volts

Values well beyond the max "safe" preset for the DRAM Calc.

I did try those DRAM calc settings anyway : and the PC just won't boot. I suspect the voltages recommanded by the calc are too low. Maybe I'm mistaken ?
Appreciate any help !

DRAMcalc is not really updated for ZEN3.
And for those voltages try ZenTimings v1.2.1

 

[equlizer]

So i worked on this for quite a few hours. Trying each setting and rebooting and benchmarking and over and over again. Can i get this higher or am i at my limit? Would it be crazy to try for Cas12?

 

[brandon7171]

So i worked on this for quite a few hours. Trying each setting and rebooting and benchmarking and over and over again. Can i get this higher or am i at my limit? Would it be crazy to try for Cas12?

Wow 14 14 14 is really awesome??? This is Gskill ram with CL16????

 

[equlizer]

Gskill CL14. IT says at the bottom of the Zentimings SC I'm tempted to try CL12 but don't want a corrupt OS

 

[Zach_01]

What’s the DRAM voltage for that?
Those are Samsung b-dies right? You can set tRFC below 300.

 

[equlizer]

What’s the DRAM voltage for that?
Those are Samsung b-dies right? You can set tRFC below 300.

Yes these are B-dies. Dram voltage is 1.5v Going below 300 yields me lower scores and higher ns. The formula for tRFC=8x tRC+8. If i want to lower I would have to change my tras and trp values because they =Trc. Tras=Tcl+Trcd +2. If you don't follow these formulas, you lead to instability and higher strain on the memory and motherboard for zero or a lot of times negative gain. I've been looking at other peoples numbers and I wonder how they came up with them.

 

[Zach_01]

Interesting...
Any suggestions?







Thats 1.45V DRAM
I did try with tRFC 408 (tRC x8) +8 but it was worst about 1ns and -0.5GB (AIDA)
If you see DRAMcalc it suggests "tRFC = (tRC x5) +8" and an alternative of "tRFC = tRC x8"

Also suggests, tRC = [(tCL + tRCDRD) +2] + (tRAS +2). Or am I getting it wrong? I didnt add 2 in both.
Meanwhile the stock 3466 primary timings are 16-18-18-18-36-54 = +2 only for tRAS.

 

[equlizer]

Try Trrds=4 and Trrdl=4 and Twrts=4. Everything that you did not manually adjust, leave at auto. Try not to use DramCalc as its not very accurate and wants you to change timings you dont need to. This info is what i have gathered from memory overclocking articles.

Twtrl =12 or 10 (mine was only stable at 14)
Twtrs =4
TWCL =TCL (can try -1 if unstable)
Trtp =14 (can try 12 or 10)
TrdrdScl/TwrwrScl =4 or 3 (mine is stable at 5)
TRC =Tras+Trp
Trrds =4
tFaw =4x Trrds
TWR =Tras minus trcd
TRFC =8x trc +8 (some say you can go lower but ymmv)
ProCDDT =Between 28 and 43.3ohm (for amd)
TRRDS/L =4
Tras =TCL+tRCDRD (+2 if unstable)

 

[OmSecond]

i just get this score thats good?

 

[JGalland]

Is it harder OCing 2x 16 GB RAM ? Because I just can't get my computer to boot when using values from the DRAM Calculator....
My model is F4-3600C16D-32GTZR, supposed to be of great quality (B-Die)

 

[Zach_01]

Is it harder OCing 2x 16 GB RAM ? Because I just can't get my computer to boot when using values from the DRAM Calculator....
My model is F4-3600C16D-32GTZR, supposed to be of great quality (B-Die)

Walk us through it... what exactly is DRAMcalc suggesting. A screenshot would be nice, and a lot of times further tweaking is required.

 

[INSTG8R]

Walk us through it... what exactly is DRAMcalc suggesting. A screenshot would be nice, and a lot of times further tweaking is required.

A shot from Taiphon Burner is also a good start point I find as well.

 

[JGalland]

Here's my Taiphon Burner info :

Spoiler: Thaiphoon Burner

Spoiler: DRAM Calc

And here's a screenshot from my Ryzen Master :

Spoiler: RyzenMaster

Isn't it weird that my SOC Voltage is so high compared to the recommanded voltages from the Dram Calc ?
My specs are :

- Ryzen 9 5900X
- Asrock X570 Taichi

 

[INSTG8R]

Well you have B-Dies you have lots of room to play with. Yes the SoC is a bit high for no good reason. I will leave Zach to evaluate your timings the Primary timings look doable fro B-Die but I think your RAM voltage is default 1.2 so will need to adjust that for sure

 

[Zach_01]

I really doubt that those timings can be achieved with only 1.35V DRAM voltage that DC suggests. Probably 1.4V or more.

Ryzen Master only reads what board is set to, and not what the board is actually supply. In order to see the actual voltages you need ZenTimings v1.2.1
Very often there is a difference for VSOC

This is with 1.45V DRAM voltage but my sticks are not so high quality, even tho they do have Samsung B-dies.

 

[INSTG8R]

I really doubt that those timings can be achieved with only 1.35V DRAM voltage that DC suggests. Probably 1.4V or more.

Ryzen Master only reads what board is set to, and not what the board is actually supply. In order to see the actual voltages you need ZenTimings v1.2.1
Very often there is a difference for VSOC

This is with 1.45V DRAM voltage but my sticks are not so high quality, even tho they do have Samsung B-dies.
View attachment 181891

Yeah that is definitely something in Ryzen Master I always question is what are just Static settings vs actual ones, but I don't use the program all that much but I can see my own BIOS settings present in certain fields

 

[JGalland]

Thanks for the insight guys.
Here's a screenshot of my ZenTimings which show that VSOC is indeed at 1.2V

So should I try the DRAM CALC timings while leaving the IMC settings on auto ? And setting the ram itself at like 1.43V ?

 

[Zach_01]

Unnecessary high voltages for “just” 3600MHz DRAM. You should lower those voltages to
VSOC: 1.1V
cLDO VDDP: 1.0V
cLDO VDDG CCD/IOD: 1.0V

And probably VDDP/VDDG can be below 1.0V (950~975mV)

You can go straight to 1.45V for RAM as long as you keep dimm temp under 45C under heavy stress.
Remember that RyzenDRAM Calculator has not been updated for Zen3 yet, and probably board BIOSs need some more work. And Asrock is not the best in implementing BIOS/UEFI very quickly, and in the most optimized way.
I think you need to be conservative at this point. First try to be stable at where you are.

16-16-16-16-34-50
tFAW: 28
tRFC: 258 (alt: 408)

 

[harm9963]

Always leave a little in reserve .

 

[brandon7171]

Unnecessary high voltages for “just” 3600MHz DRAM. You should lower those voltages to
VSOC: 1.1V
cLDO VDDP: 1.0V
cLDO VDDG CCD/IOD: 1.0V

And probably VDDP/VDDG can be below 1.0V (950~975mV)

You can go straight to 1.45V for RAM as long as you keep dimm temp under 45C under heavy stress.
Remember that RyzenDRAM Calculator has not been updated for Zen3 yet, and probably board BIOSs need some more work. And Asrock is not the best in implementing BIOS/UEFI very quickly, and in the most optimized way.
I think you need to be conservative at this point. First try to be stable at where you are.

16-16-16-16-34-50
tFAW: 28
tRFC: 258 (alt: 408)

When I get home I will try this. I have Asus rog crosshair VIII formula. With the power draining out could this still be a motherboard issue r a ram issue maybe I can call Asus and find out. I hope it’s a ram issue bc it’s a easy fix just buy more ram.

 

[Zach_01]

Ok, ASUS...
But there is nothing wrong with the board. Just some boards are supplying voltage a little to the high side. Depending maybe on BIOS, RAM and CPU combo. No one can really tell. Nothing to worry about things that can be regulated.

 

[juanyunis]

Hi guys,

I'm new here, I just read the whole thread and I see some really good people with memory settings, and I was wondering if i could get some help with my system.

I'm currently running a Ryzen 5950X with X570 Aorus Master, using PBO Advanced. I'm able to achieve some nice CPU performance, single boost clocks upto 5.1Ghz and all core clocks about 4.45 - 4.5Ghz. However I'm not an expert with memory settings and I think my system could do better. The memory sticks I have are 4x8GB 4000Mhz CL18 Teamgroup T-Force Xcalibur Special Edition and according to Thaipoon Burner they are Samsung B-die A2 bin. This is what I have achieved so far using Ryzen DRAM Calculator running the FAST profile but with gear down mode enabled.

I have not been able to be stable with 1T command rate and gear down mode disabled, if I enabled gear down or put command rate to 2T it works. What you guys think?
Note: I tried running FCLK at 2000Mhz with 4000Mhz memory but my system doesn't post, I guess is because of the strain for the memory controller with 4 sticks.

Thanks for the help.

 

[Zach_01]

Hi guys,

I'm new here, I just read the whole thread and I see some really good people with memory settings, and I was wondering if i could get some help with my system.

I'm currently running a Ryzen 5950X with X570 Aorus Master, using PBO Advanced. I'm able to achieve some nice CPU performance, single boost clocks upto 5.1Ghz and all core clocks about 4.45 - 4.5Ghz. However I'm not an expert with memory settings and I think my system could do better. The memory sticks I have are 4x8GB 4000Mhz CL18 Teamgroup T-Force Xcalibur Special Edition and according to Thaipoon Burner they are Samsung B-die A2 bin. This is what I have achieved so far using Ryzen DRAM Calculator running the FAST profile but with gear down mode enabled.

View attachment 182936
View attachment 182937

I have not been able to be stable with 1T command rate and gear down mode disabled, if I enabled gear down or put command rate to 2T it works. What you guys think?
Note: I tried running FCLK at 2000Mhz with 4000Mhz memory but my system doesn't post, I guess is because of the strain for the memory controller with 4 sticks.

Thanks for the help.

The "problem" beyond 1900MHz is mostly FCLK not be able to hold that speed. Maybe that could be changed in future for 5000series CPUs with better BIOS/UEFI.

Did you try with more than 1.42V for DRAM when disabling GDM? Like 1.45V or more? Have a fan over sticks though. 4 full dimms with little to no space in between them can increase temp really quickly.
Samsung B-dies can sustain and scale good with high voltage, but can produce errors rather quickly when overheated. With proper cooling even 1.5~1.6V is ok for daily usage.

You can try
1.45~1.48V for DRAM (with additional cooling than case airflow)
16-18-18-18-36-54
tRFC 278 (tRC x5 +8)
tRRDS 5
tRRDL 8
tFAW 20 (tRRDS x4)
GDM Disabled

Also...
1. PowerDownMode: Disabled
2. SoC/Uncore OC mode: Enabled
3. DF C-states: Disabled

These 3 settings are power savings for "DRAM", "SoC (IOD)" and "InfinityFabric" respectively. When you OC memory subsystems its better to have all power savings disabled.

 

[juanyunis]

The "problem" beyond 1900MHz is mostly FCLK not be able to hold that speed. Maybe that could be changed in future for 5000series CPUs with better BIOS/UEFI.

Did you try with more than 1.42V for DRAM when disabling GDM? Like 1.45V or more? Have a fan over sticks though. 4 full dimms with little to no space in between them can increase temp really quickly.
Samsung B-dies can sustain and scale good with high voltage, but can produce errors rather quickly when overheated. With proper cooling even 1.5~1.6V is ok for daily usage.

You can try
1.45~1.48V for DRAM (with additional cooling than case airflow)
16-18-18-18-36-54
tRFC 278 (tRC x5 +8)
tRRDS 5
tRRDL 8
tFAW 20 (tRRDS x4)
GDM Disabled

Also...
1. PowerDownMode: Disabled
2. SoC/Uncore OC mode: Enabled
3. DF C-states: Disabled

These 3 settings are power savings for "DRAM", "SoC (IOD)" and "InfinityFabric" respectively. When you OC memory subsystems its better to have all power savings disabled.

Thanks for the reply. I did everything you mentioned but no luck with gear down mode disabled, but it did improve my latency to 57.3. I guess I would have to wait for better BIOS, maybe AGESA 1.1.8.0. Do you think that CL14 is possible at 3800mhz with my kits?