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Thread: NEW!!! DRAM Calculator for Ryzen™ 1.6.2 (overclocking DRAM on AM4) + MEMbench 0.8 (DRAM bench) Reply to Thread
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  Topic Review (Newest First)
01-19-2020 10:48 PM
rastaviper
Quote: Originally Posted by gene-z View Post
Thanks, you seem to be correct. 3600 run at 70ns compared to 76ns when at 4333. Also, the read/write speeds are slightly faster at 3600/cl16.



So is all the extra headroom I have essentially useless? Or is it possible to sync the memory/fabric/nb clock and use higher frequencies?
It's all known for months. The gold spot for performance for Ryan is around 3733-3800mhz.
That's why low (14-14-14) timings at 3733 can get 62.5ns and your setup at 4333 is at 76ns!

Sent from my ONEPLUS A6003 using Tapatalk
01-19-2020 09:36 PM
gene-z
Quote: Originally Posted by eliwankenobi View Post
Nice! But I see your Memory Clock, Fabric Clock and NorthBridge Clock are all out of sync. You may be having a big latency penalty.

Try running a benchmark from a game or something. Then change the frequency and timings to 3600Mhz at CL16 or something and test again the same benchmark... You may see that you were actually loosing performance by running your memory at too high speed for Ryzen.
Thanks, you seem to be correct. 3600 run at 70ns compared to 76ns when at 4333. Also, the read/write speeds are slightly faster at 3600/cl16.

So is all the extra headroom I have essentially useless? Or is it possible to sync the memory/fabric/nb clock and use higher frequencies?
01-19-2020 08:45 PM
eliwankenobi
Quote: Originally Posted by gene-z View Post
Not much info out there about Micron D-Die and the calculator doesn't support it much, but this stuff is pretty insane. Not sure if I got lucky, but I got a 3200 cl16 kit running at 4333 cl18 at the stock 1.35v. Not bad for a $65 kit I got on sale, especially when 4333 cl19 sells for $270

https://i.imgur.com/LPzYRwH.png
https://imgur.com/a/3X27pAQ

Didn't do much, just tweaked it from 16-18-18-18-32 to 18-23-10-18-30 and bumped up the frequency.

The kit is CMK16GX4M2Z3200C16.
Nice! But I see your Memory Clock, Fabric Clock and NorthBridge Clock are all out of sync. You may be having a big latency penalty.

Try running a benchmark from a game or something. Then change the frequency and timings to 3600Mhz at CL16 or something and test again the same benchmark... You may see that you were actually loosing performance by running your memory at too high speed for Ryzen.
01-19-2020 06:49 PM
gene-z Not much info out there about Micron D-Die and the calculator doesn't support it much, but this stuff is pretty insane. Not sure if I got lucky, but I got a 3200 cl16 kit running at 4333 cl18 at the stock 1.35v. Not bad for a $65 kit I got on sale, especially when 4333 cl19 sells for $270

https://i.imgur.com/LPzYRwH.png
https://imgur.com/a/3X27pAQ

Didn't do much, just tweaked it from 16-18-18-18-32 to 18-23-10-18-30 and bumped up the frequency.

The kit is CMK16GX4M2Z3200C16.
01-19-2020 01:37 PM
Gunderman456 Probably use the A-die settings on both as the B-die would be more forgiving.
01-19-2020 12:44 PM
kifac im stuck on what to do here...im familair with Dram calculator and it works fine when i use two sticks of RAM. I originally had 16GB of Gskill ripjaws and went out to buy another 2X8GB of the same ram at my local computer shop.


System boots perfectly fine with 32GB using DOCP at 3200mhz. No errors.


I went to use DRAM calculator and to my surprise in thaiphoon. Each set of RAM is a different die density??
My original set are hynix 8 Gb A-die (21 nm) / 1 die


and my second set are spektek 8 Gb B-die (20 nm) / 1 die


how is it that they have the same product number yet use 2 different die/chips??
Is it just my luck?


What do i do in this situation and how do i go about trying to overclock these sticks?


Do i use the Thaiphoon settings from the A die and use the timings of that from the calculator?


Thanks
01-19-2020 11:34 AM
kratosatlante At last I was able to set the IF in 1900, with bclk at 99.8 (at 100 it gives me 07 code error) with 4 stiks of ram, it is stable, I tried to adjust more the timings, like trcdwr in 8 or trfc 252 or 240 but I don't improve the Latency, the minimum was 65.4, some advice to test GDM off, with 2 stiks at 3200 you need cpu on die 40, cad 120-20-20-24, with 4 to 3200 cant gdm off, any suggestion to lower latency

timings for 3800 its copy of ismus for 3733, the timings of calculator for 3800 got same latency
01-19-2020 11:13 AM
kratosatlante
Quote: Originally Posted by marcelo19941 View Post
Tightening timings! Any tips?
Put vddr soc manual, in auto its to high
01-19-2020 11:11 AM
kratosatlante Put vddr soc manual, in auto its to high
01-19-2020 07:54 AM
ylpkm
Quote: Originally Posted by marcelo19941 View Post
Tightening timings! Any tips?
SCL's could be lowered by 1 for slight performance bump, maybe lower row cycle time and ras active time a bit. maybe ras active to 28-32 and row cycle time to 42-48.
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