AMD Zen 2 Memory Performance Scaling with Ryzen 9 3900X

[Durvelle27]

So now I’m wondering if I should upgrade my ram

 

[nemesis.ie]

With a bit of manual tuning.

Over 3066 still seems to be very unstable, with luck the new AGESA will come out this week.

At 3000MHz with the same timings as above:

 

[Wickedt]

I used Ryzen mem calculator to adjust my timmings tighter on my flare x 3200, heres cpuz info

With a bit of manual tuning.

Over 3066 still seems to be very unstable, with luck the new AGESA will come out this week.


View attachment 126896

At 3000MHz with the same timings as above:

View attachment 126897

BTW, what is the version of windows you are using? Beta? or is it windows insider edition?

 

[nemesis.ie]

Insider. It's one flight behind as the latest one causes my mouse to move erratically and GPU performance to tank, it's like there is a 24hz update rate set for mouse and screen.

They should have it fixed in the next one I imagine.

I'm hoping I get a new UEFI soon as this one is restricting things.

I have tighter timings than you but can't go over ~3066 for now at any timing. I think your 3200MHz is helping in CB.

They have not released 1.0.0.3 for the X470 version yet.

 

[paridoth81]

I would really like to know what the performance hit is for RAM with looser timings like CL16 for DDR4-3200 and CL19 for DDR-3600 since they cost a fraction of higher-end RAM modules. Also, did I understand correctly that for gaming OCing the timings is more worth it that OCing the frequency?

 

[Wickedt]

I would really like to know what the performance hit is for RAM with looser timings like CL16 for DDR4-3200 and CL19 for DDR-3600 since they cost a fraction of higher-end RAM modules. Also, did I understand correctly that for gaming OCing the timings is more worth it that OCing the frequency?

Do lots of research because a lot of the time, the timings can get much tighter, and AMD loves the tighter timings. A lot of ram will go higher then what they are rated for. A great program to use is Ryzen Dram calculator, theres also a video on youtube on how to use the program. There,s also the silicon lottery, were you get a chip that you can really change up to faster settings.

 

[Marucins]

People seem to forget memory overclocking is a thing that can be done, so buy ludicrously expensive memory kits. 4000+ MHz kits are just stupid and usually have awful timings anyway. Literally, just get a cheap B-die kit and either overclock it yourself or use the DRAM Calculator for Ryzen...

OK, how can I know and be 100% sure that the bones are B-DIE?

 

[Lorec]

OK, how can I know and be 100% sure that the bones are B-DIE?

B-Die Finder

Find Samsung B-Die DDR 4 memory kits on Amazon, Newegg and many more.

benzhaomin.github.io

 

[paridoth81]

Do lots of research because a lot of the time, the timings can get much tighter, and AMD loves the tighter timings. A lot of ram will go higher then what they are rated for. A great program to use is Ryzen Dram calculator, theres also a video on youtube on how to use the program. There,s also the silicon lottery, were you get a chip that you can really change up to faster settings.

I cant really research anything because I havent bought my RAM yet. I would like to make an informed decision before bying and so far all reviewers report that more expensive memory is faster... duh! My intuition tells me that looser timings will have a minimal impact on performance when compared to the price delta (which is 80-100%). but i'd like to actually know

The idea was to use memory timings that the masses can actually afford, not some halo numbers. I'll look at getting some runs in with tighter timings later this week when things are bit less crazy

I absolutely agree with you. For the vast majotity of people looking to build a new system, money directed towards memory would be better spent elsewhere. I would actually like to know the performance hit for even looser timings like CL16 for DDR4-3200 and CL19 for DDR-3600 since they cost a fraction of higher-end RAM .

 

[bug]

I absolutely agree with you. For the vast majotity of people looking to build a new system, money directed towards memory would be better spent elsewhere. I would actually like to know the performance hit for even looser timings like CL16 for DDR4-3200 and CL19 for DDR-3600 since they cost a fraction of higher-end RAM .

To put it another way, RAM is the second fastest component in your PC (behind the CPU). If you have a bottleneck, there's a good chance it's somewhere else. If you know you're doing memory intensive stuff, then sure, squeeze everything you can out of those sticks.

 

[Marucins]

@Marucins If you don't see a post from me over the next few days, PM me to remind me and as mentioned, I will update with how I get on with the 3733 kit. It easily does 3200 (and 3333CL16) with a 2700X so I would think 4 sticks SR should be easy with Zen 2.

They are Samsung B-die, SR.

I also imagine Zen 2+/Zen 3 will improve things further, so getting a bit faster now, may work out well if you plan to pop in a new CPU next year.

What board do you have? Apparently the TaiChi X570 has a T topology which should be better for 4 modules.

Completely fu ... construction of this board :\

https://www.reddit.com/r/Amd/comments/ccyxmn/psa_x570_taichi_design_flaw_chipset_overheat

 

[Lorec]

Completely fu ... construction of this board :\

https://www.reddit.com/r/Amd/comments/ccyxmn/psa_x570_taichi_design_flaw_chipset_overheat

same spot as any other x570 pretty much.
actually might have dodged a bullet there as I had blower 1080ti in first slot and mounted accelero whiched forced me to put the card in second slot (heatsink wouldnt fit)
regardless chipset fat runs at 2000ish rpm which is beyond me

 

[Wickedt]

Completely fu ... construction of this board :\

https://www.reddit.com/r/Amd/comments/ccyxmn/psa_x570_taichi_design_flaw_chipset_overheat

I think this is a very exaggerated thing, its not an issue for me, i suppose, because my gpu is on a riser, and i have a huge case, however, my chipset still runs 55 to 75 depending on what im doing.
The benefits 570 bring to the table far outweigh these silly issues. Btw Asrock already came up with a few bios updates to manage this.

 

[paridoth81]

The benefits 570 bring to the table far outweigh these silly issues. Btw Asrock already came up with a few bios updates to manage this.

You mean the benefits benefit of PCI-e 4? Is that even a benefit in 2019?

 

[TheLaughingMan]

You mean the benefits benefit of PCI-e 4? Is that even a benefit in 2019?

No there is not. PCIe 4.0, much like hardware accelerated ray tracing, is just too new to have a benefit of any kind at this point. Maybe in 2 or 3 years. Also didn't der8auer test the chipset on the Gigabyte boards and file they don't produce enough heat to require active cooling?

 

[mrgupta]

I was looking at an updated test an hour or two ago, a test I was super happy about, with the Sniper X 3600 CL19 ram. Suddenly it disappeared and I can't find it anymore, I dunno what's happening.

edit: nevermind, it's the test from March 20th

 

[bug]

No there is not. PCIe 4.0, much like hardware accelerated ray tracing, is just too new to have a benefit of any kind at this point. Maybe in 2 or 3 years. Also didn't der8auer test the chipset on the Gigabyte boards and file they don't produce enough heat to require active cooling?

Hey, RTRT has the benefit of developers getting their feet wet.
I'm probably the last person to argue against new tech, but while PCIe 4.0 doesn't offer much, it it still lets you enjoy its drawbacks today: significantly more expensive motherboards, increased power draw and an additional fan to go with that.

 

[Wickedt]

This Flare X memory is crazy stuff, i was going to buy an expensive CAS16 3600mhz kit, but my flare x was so easy to get to 3600, with CAS16 no less. I am sure i can get it to run at CAS15, but theres a glitch in the bios that wont let me set it at 15, defaults to 16. All this at 1.39v to boot.

PS I set the infinity fabric to 1800mhz, to match the dram frequency, is that a good thing to do?

Another question, what is FSBRAM? Is that the ratio of the front side bus at 100mhz to 3600mhz dram?

 

[evilhf]

I got these results!
This is looking too awesome, or my memory and cpu are binary.

I recorded a video, and in recording the result went up to 11.1ns.

 

[Durvelle27]

So looking at this I’m thinking is it worth swapping my current 2400MH @17-17-17 RAM for 3200MHx paired with a 3900X

 

[jesdals]

Testing my new Corsair kit - I noticed a strange thing. The standard timing of the kit was CL18-19-19-39. Trying to change the settings in bios to CL17 did nothing it stayed at CL18. I then changed the settings to CL-16 and it worked. Tried some settings there and wanted to try CL15, again boot witout problems like at CL17. But both CPUid and HardwareInfo64 showed it as CL16. Unfortunately no luck setting the kit to CL14.

 

[jesdals]

Testing my new Corsair kit - I noticed a strange thing. The standard timing of the kit was CL18-19-19-39. Trying to change the settings in bios to CL17 did nothing it stayed at CL18. I then changed the settings to CL-16 and it worked. Tried some settings there and wanted to try CL15, again boot witout problems like at CL17. But both CPUid and HardwareInfo64 showed it as CL16. Unfortunately no luck setting the kit to CL14.

Using Ryzen Dram Calculator and by disabling XMP I manged these settings - with 1.450v to the mem

 

[cadaveca]

Testing my new Corsair kit - I noticed a strange thing. The standard timing of the kit was CL18-19-19-39. Trying to change the settings in bios to CL17 did nothing it stayed at CL18. I then changed the settings to CL-16 and it worked. Tried some settings there and wanted to try CL15, again boot witout problems like at CL17. But both CPUid and HardwareInfo64 showed it as CL16. Unfortunately no luck setting the kit to CL14.

Many odd-numeral CAS timings are not actually supported by AMD's CPUs currently. Totally normal.

 

[jesdals]

I tried to tinker som more with my settings and after several attemps and setting up both of my two bios´s - it seems that I have hit the sweet spot - any thing else is not stable, the same goes for the cpu speed at 4525MHz

 

[erek]

Will these native 3733 DDR4 sticks work with X570 chipset? for that magickal 1:1 IF ratio?

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