Ryzen 7000 Said to Have a DDR5-6000 Memory "Sweet Spot"

[Wirko]

AMD will once again have a single variant of CCD silicon (not counting the 4c) and I see it as a disadvantage. A new die probably wouldn't cost more than a few million $ to develop. Then they would have a 10-core and a 6-core variant for example, allowing them to offer a range of 4- to 20-core Ryzens with more flexibility and less waste. It wouldn't hurt the Epyc part either, as now there are models having anywhere between 1 and 8 working cores per die.

 

[Chrispy_]

1:1 should be 3000 MHz no?
My FLCK is running at 1900 MHz 1:1 with my 3800 MHz DDR4 memory.

I was just thinking that 1900 > 3000 is a BIG jump. I guess we're going from shitty GloFo 14 to TSMC 7 for the IO die now, but that's still a 60% jump. If the CPU boost clocks went from 5GHz to 8GHz in one generation, you'd be surprised, no?

 

[Taraquin]

Okay, is that 3GHz FCLK or 1500MHz FCLK?

If it's 3GHz, that's one hell of a leap forwards from Zen3...

3GHz it seems. The very best Zen 3 could do 2100fclk, Cesanne could do 2300fclk so 3000 is a major improvement

I was just thinking that 1900 > 3000 is a BIG jump. I guess we're going from shitty GloFo 14 to TSMC 7 for the IO die now, but that's still a 60% jump. If the CPU boost clocks went from 5GHz to 8GHz in one generation, you'd be surprised, no?

Going from GF 12nm to TSMC 6nm if I remember correctly

 

[zlobby]

This thing is going to be a beast!

Can't wait to put my hands on a TR or an EPYC!

 

[spnidel]

they did talk about memory OC being a focal point for the new ryzen processors, so this makes sense now

 

[ratirt]

3GHz it seems. The very best Zen 3 could do 2100fclk, Cesanne could do 2300fclk so 3000 is a major improvement


Going from GF 12nm to TSMC 6nm if I remember correctly

It says a sweet spot. Going with that notion Zen3 sweet spot was 3600Mhz which is 1800Mhz IF. You could still bump it to 2000Mhz.
If the 3000Mhz is the sweet spot for Zen4 maybe there is still headroom for 3200Mhz IF which would correspond to a 6400Mhz ram memory. It seems possible.

 

[TheLostSwede]

It says a sweet spot. Going with that notion Zen3 sweet spot was 3600Mhz which is 1800Mhz IF. You could still bump it to 2000Mhz.
If the 3000Mhz is the sweet spot for Zen4 maybe there is still headroom for 3200Mhz IF which would correspond to a 6400Mhz ram memory. It seems possible.

3600 MHz was the recommended performance option, not the sweet spot.
3733 was the performance sweet spot.

 

[Calenhad]

3600 MHz was the recommended performance option, not the sweet spot.
3733 was the performance sweet spot.

And what happens if you extrapolate a missing 1:1 3800C17 data point? There is not a sweet spot at 3733, the slide is lacking the necessary resolution to make that conclusion.

 

[Punkenjoy]

And what happens if you extrapolate a missing 1:1 3800C17 data point? There is not a sweet spot at 3733, the slide is lacking the necessary resolution to make that conclusion.

When AMD said 3600 was the sweet spot, it was the sweet post for cost/performance/stability.

But yeah, if you only consider the performance, the higher you can maintain 1:1, the better it is.

 

[Tomorrow]

Dual Rank says it all here. Zen3 single rank is easy to get 1900-2000. For Dual Rank you had to up the voltage and prey to the silicon gods 1900 Mhz would work.

RAM Ranks don't influence IF clock. IF clock is determined by silicon quality. Im using 5800X3D and i cant go above 1866 despite using single rank DIMM's.
My 3800X could only do 1800 stable, 1866 with 1 WHEA error per day, 1900 no boot and 1933 with massive amount of WHEA errors. All while using the same RAM i use now.

 

[TheLostSwede]

And what happens if you extrapolate a missing 1:1 3800C17 data point? There is not a sweet spot at 3733, the slide is lacking the necessary resolution to make that conclusion.

This is what AMD said around launch time, so that's what we have to compare with in terms of the sweet spot terminology, that's all.

 

[Tropick]

regressing to 4 cores per ccx scares me, if that part is correct.

Seriously. Everyone's hyped about the memory controller and don't get me wrong that's cool but we seriously need some clarification on A: if this is true and B: if it is true, how are they going to handle the latency hit. Hopefully 1usmus just made an assumption but since he's the guy behind CTR he seems like he would know...

 

[Tomorrow]

Seriously. Everyone's hyped about the memory controller and don't get me wrong that's cool but we seriously need some clarification on A: if this is true and B: if it is true, how are they going to handle the latency hit. Hopefully 1usmus just made an assumption but since he's the guy behind CTR he seems like he would know...

He works at AMD now i believe. I very much hope this 4c CCX is not true. Moving to 8c CCX was one the best things for gaming with 5000 series.
I mean i have 5800X3D so im not upgrading before Zen5 V-Cache models come out in 2024 most likely along with 10000 DDR5 speeds.

 

[mechtech]

Well, the rumour mill claims DDR5 prices will drop quite a bit very soon.

I guess time will tell. I recall when AM4 came out ddr4 skyrocketing.

 

[TheLostSwede]

I guess time will tell. I recall when AM4 came out ddr4 skyrocketing.

This will supposedly be bundle deals.

 

[Timelessest]

Do you guys think am5 will also have the same Agesa problems that am4 had at the start? Like only recently amd zen 5000 can achieve 1:1 with 4000 mhz

 

[TheLostSwede]

Do you guys think am5 will also have the same Agesa problems that am4 had at the start? Like only recently amd zen 5000 can achieve 1:1 with 4000 mhz

Possibly. The major issues have been resolved from what I understand, but expect a day one UEFI update at the very least.

 

[Wirko]

I was just thinking that 1900 > 3000 is a BIG jump. I guess we're going from shitty GloFo 14 to TSMC 7 for the IO die now, but that's still a 60% jump. If the CPU boost clocks went from 5GHz to 8GHz in one generation, you'd be surprised, no?

It's one generation of DDR, not one generation of processors. So, in something like five years, the data rate has doubled.

 

[TheDeeGee]

$_$

 

[HD64G]

Just FYI, Zen2 & 3 had their RAM sweet spot at 3733MT/s with the IF@1867MHz. So, if the Zen4 has its best RAM spot at 6GT/s with the IF@3GHz, imho that is a big step up. Cost for good RAM early on when we go to a new faster type is high but in a year or so it might become normally priced for much more people.

 

[Dyatlov A]

Sweet spot for the processor, but not sweet spot for buyers. DDR5 6000 can be quite pricey at this point.

I purchased 2x8GB Patriot 4800MHz for no money and takes easily 6000MHz CL32 with 1.25V and even 7000MHz possible with more juice. So not a big deal!

 

[zlobby]

I purchased 2x8GB Patriot 4800MHz for no money and takes easily 6000MHz CL32 with 1.25V and even 7000MHz possible with more juice. So not a big deal!

3.6GHz. Not great, not terrible.

 

[Steevo]

Set cache L3 = IF with better capacitor and termination on die. The voltage differential for DDR signaling and die process is a function of real estate on the die cost VS performance gain anymore. AMD is willing to sacrifice some cost in die space for better memory latency. It’s also probably a function of tolerance for termination resistors built into the die, prevent standing wave resonance with close tolerance in manufacturing.

 

[Chrispy_]

It's one generation of DDR, not one generation of processors. So, in something like five years, the data rate has doubled.

No, I'm not talking about DDR speeds. I'm talking about FCLK speeds. The only reason DDR speeds are relevant is because of the FCLK:MCLK ratio of 1:1 or 1:2

 

[marios15]

No, I'm not talking about DDR speeds. I'm talking about FCLK speeds. The only reason DDR speeds are relevant is because of the FCLK:MCLK ratio of 1:1 or 1:2

That has been the case since....2000?