TheLostSwedeKeep in mind that at least the current Ryzen 3000-series memory controller doesn't seem to like odd CAS latencies, so 15 might be a no go.

Zach_01The principal is exactly the same with ZEN2, and if true, the only thing changing is the 3800MHz -->> 4000MHz (2000MHz) upper limit for 1:1:1 synchronization.

And I believe that DRAMcalc will probably need an update for the new 5000. But dont expect it to be updated upon Nov5th. These things need time...

MakaveliIt will I was checking today and any attempt to set 4000 with my B-die gives me this error.

MakaveliIt will I was checking today and any attempt to set 4000 with my B-die gives me this error.

mtcn77Perhaps, your dimms are inserted incorrectly?

lynx29Zen 3 is a whole new ball game with ram though so I am not worried about it. also since im aiming for 4000 on my 32 gig kit... hopefully i can get 16-18-18... we will see..

TheLostSwedeHow so? I was told they've only done minor changes to memory controller.

Chrispy_Not even minor changes.

btarunrEach of the two CCDs (8-core CPU dies) has just one CCX (CPU core complex) with 8 cores, and hence the CCD's internal Infinity Fabric cedes

mtcn77Is it, though?

Chrispy_Yes. Google is your friend :)
Anandtech and THG both officially confirmed by AMD from different sources.

In case you're wondering where any of the confusion comes from regarding the I/O die manufacturing process, all Zen2 CPUs use an I/O die fabbed on GloFo 12nm. The X570 chipset is fabbed on GloFo 14nm. You might be asking yourself what the X570 has to do with anything?

Well, they're the same thing; The X570 chipset is just a Mattise I/O die made on an older, cheaper process node. and that's why even though a Zen2 I/O die as part of a CPU uses around 12W, the X570 chipset's older 14nm process means it can draw up to 20W and necessitates active cooling.

MxPhenom 2161.5v what in the actual f****

So with Ryzen, is 2 sticks better than 4? I know with Intel systems there isn't really an issue with 4 sticks and running high speeds and lower latency.

AusWolfJust had a quick look... The price difference between 3600 and 4000 MHz RAM is massive (at least here in the UK). Will have to wait for benchmarks to see if it's worth it.

INSTG8RWell I learned something., I knew it was GoFlo but thought X570 was also 12nm.

Chrispy_It might be at this point. AMD reserves the right to change the product without notification, and that confirmation was 15 months ago.

Chrispy_Well, they're the same thing; The X570 chipset is just a Mattise I/O die made on an older, cheaper process node. and that's why even though a Zen2 I/O die as part of a CPU uses around 12W, the X570 chipset's older 14nm process means it can draw up to 20W and necessitates active cooling.

TheLostSwedeWith a bit of luck, you can get some 3733MHz modules and run them at 4000MHz, at least if it works anything like my 3600MHz that I run at 3800MHz and tighter latencies.
Again, keep in mind that most memory is designed and tested for Intel or Intel and AMD's memory controller doesn't behave in the same way.

Chrispy_I'm kind of hoping this is the case too. I have a bunch of 3600 available and absolutely zero sticks of faster RAM. I'm mostly interested in FCLK gains and don't fancy paying through the nose for what is likely to be only a small ~5 improvement over budget-grade 3600. I think the best RAM I have is Hynix C-die that'll do 3600 C16, any ideas what clocks that'll reach if I slacken the timings?

TheLostSwedeMy Patriot Viper Steel modules are Hynix C-dies and as you can see in my system spec, they run just fine way out of spec.
They're supposed to be 3600MHz 17-19-19-39, but they run fine at 3800MHz 16-19-16-36.

TheLostSwedeSupposedly four is better than two, unlike Intel.
Not a whole lot of proof out there, but I have no problem running four sticks at higher clocks and lower latencies than they're rated at.
This is the only test I've seen and it looks like the Ryzen 3000's memory controller likes four sticks of RAM and it seems to be the same across games and applications.
I guess more RAM might also help to a degree in these tests. This is also quite old and more recent AGESA/UEFI releases should have further improved things.
www.tomshardware.com/reviews/amd-ryzen-3000-best-memory-timings,6310-2.html


With a bit of luck, you can get some 3733MHz modules and run them at 4000MHz, at least if it works anything like my 3600MHz that I run at 3800MHz and tighter latencies.
Again, keep in mind that most memory is designed and tested for Intel or Intel and AMD's memory controller doesn't behave in the same way.

Chrispy_This stuff?

tabascosauzDistinction there is that you're running 4 single rank sticks, which for most intents and purposes is about equal (in "difficulty" for the IMC to sustain) to 2 dual rank sticks like mine, as they're both 2 ranks per channel and the same density.

I think you'll find that 4 x dual rank sticks with any 8Gb die (B-die, CJR, Rev.E) totaling 64GB total might be a rather different, difficult and underwhelming experience.

Looks like AMD's Achilles heel (IF) won't be changing too much this generation. The UMC remains as strong if not stronger tham Matisse (already had a comparable or better memory controller than Intel), but the +200MHz is probably coming from more optimized IF traces on the substrate and the CCX layout reshuffle moving uncore components physically closer to the I/O die.

TheLostSwedeSupposedly four is better than two, unlike Intel.
Not a whole lot of proof out there, but I have no problem running four sticks at higher clocks and lower latencies than they're rated at.
This is the only test I've seen and it looks like the Ryzen 3000's memory controller likes four sticks of RAM and it seems to be the same across games and applications.
I guess more RAM might also help to a degree in these tests. This is also quite old and more recent AGESA/UEFI releases should have further improved things.
www.tomshardware.com/reviews/amd-ryzen-3000-best-memory-timings,6310-2.html


With a bit of luck, you can get some 3733MHz modules and run them at 4000MHz, at least if it works anything like my 3600MHz that I run at 3800MHz and tighter latencies.
Again, keep in mind that most memory is designed and tested for Intel or Intel and AMD's memory controller doesn't behave in the same way.

AusWolfI don't want a bit of luck. I prefer being certain. :pimp: