16 or 32GB Modules >3600Mhz - Any point?

richardjb

richardjb

richardjb

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Hi all - I'm just about to purchase a new AM4 motherboard that supports upto 4400Mhz DDR4

As well as gaming, I have requirements for photoshop (macro stacking) and running multiple VMs in a lab, so would prefer to have either 64GB or 128GB (the boards max) available to use.

The question is, are there any modules that are >3600Mhz and are either 16GB or 32GB per stick - or should I not overly worry about RAM speed as it would make NO real world difference to me.

ignoring cost gradients, what are the thoughts.??

Rich
 
3600 is the generally accepted sweet spot for Ryzen CPUs, 3800 is possible but only on a select few as it's down to the CPU, motherboard, RAM & cooling. You get the best performance by keeping your RAM and IF at a 1:1 ratio, you won't get anywhere near 4400MHz so best look for either RAM that has Samsung B-Die or Micron E-Die :)
 
MrPotato said:
3200 that can run at 3600 (not guaranteed), or 3600. For your use, more RAM will bring more benefits than anything faster than 3600.
Click to expand...

Thanks decision made, I think -- CORSAIR VENGEANCE RGB PRO 64GB (2x32GB) DDR4 3600 (PC4-28800) C18

Although someone said C18 is slow? are there alternatives for 32GB sticks @ 3600Mhz
 
EsaT said:
Only 16-16-16 kits are guaranteed B-die.
C16s with looser following timings can be something else.
Price is the best indicator for that.
Click to expand...

Would I even notice C18 vs C16? -- I cannot find any 3600Mhz 32GB modules that are C16

In fact come to think of it -- is C16 vs C18 more important than 3200Mhz vs 3600Mhz?
 
richardjb said:
Would I even notice C18 vs C16? -- I cannot find any 3600Mhz 32GB modules that are C16

In fact come to think of it -- is C16 vs C18 more important than 3200Mhz vs 3600Mhz?
Click to expand...
You're not looking at high enough prices.
For example G.Skill has multiple 3600MHz 16-16-16 kits, they just cost literal arm and leg.
16-19-19 kits are mid way.


Latencies are measured in clock cycles, so clock speed affects to actual absolute latency time.
3600MHz CL18 has same DIMM's internal CAS latency as 3200MHz CL16. (10 ns)
Expensive B-die 3200MHz CL14 would again beat it clearly. (~8.75 ns)
Also beating 3600MHz CL16 (~8.89 ns) slightly.
Following latencies behave similarly.
So pretty high level for 3600MHz 16-18-18 kits loose to that expensive 3200MHz 14-14-14.

Though in case of Ryzen another factor is memory bus speed affecting to speed of CPU's internal InfinityFabric bus.
Hence 3600MHz CL16 has similar overall access latency than 3200MHz CL14.

There are some performance reviews, but not very much of thorough.
But certainly 3200MHz CL16 can be considered as decency level if you care about performance.
(18 cycles at 3200MHz is already ~11.25 ns)
That's also where price is good.
3600MHz CL18 should be about similar.

Then there's that 3200MHz CL16 Crucial Ballistix, which should overclock to3600MHz CL16 with high probability.
 
A QVL list should tell you what is Micron or Samsung. I just settled on some Corsair, took me a long time to find some. All the good stuff they seem not to make anymore, weird.
 
EsaT said:
You're not looking at high enough prices.For example G.Skill has multiple 3600MHz 16-16-16 kits, they just cost literal arm and leg. 16-19-19 kits are mid way.

Latencies are measured in clock cycles, so clock speed affects to actual absolute latency time. 3600MHz CL18 has same DIMM's internal CAS latency as 3200MHz CL16. (10 ns)
Expensive B-die 3200MHz CL14 would again beat it clearly. (~8.75 ns)
Also beating 3600MHz CL16 (~8.89 ns) slightly.
Following latencies behave similarly.
So pretty high level for 3600MHz 16-18-18 kits loose to that expensive 3200MHz 14-14-14.

Though in case of Ryzen another factor is memory bus speed affecting to speed of CPU's internal InfinityFabric bus.
Hence 3600MHz CL16 has similar overall access latency than 3200MHz CL14.
Click to expand...

You guys are amazing, thank you for all responses.
still cant find 2x32Gb C16 @ 3600Mhz, but will keep looking, or consider OC’ing 3200’s
rich
 
richardjb said:
You guys are amazing, thank you for all responses.
still cant find 2x32Gb C16 @ 3600Mhz, but will keep looking, or consider OC’ing 3200’s
rich
Click to expand...
Hi Rich,

Did you ever find something suitable at CL16?
I'm in the same boat. Currently, building a Ryzen 3950X system and need at least 64GB.
The new Crucial Ballistix range look great, and are reasonably priced but no stock anywhere.

Have ordered the Vengeance LPX 2x32GB kit, but am considering changing to the RGB Vengeance Pro, as they're the same price.
It's hard to make a decision, as I can't find out if the two kits use the same ICs, or if one might be better than the other.
I'm told they will either be using Micron or Hynix, but can't find any CPU-Z or Thaiphoon output to confirm.

Andy.


*** Competitor info removed ***
 
Last edited by a moderator:
Turns out that the Vengeance LPX and Vengeance RGB Pro are both using a new Hynix CMR die.
Things like Ryzen DRAM calculator haven't been updated to include it yet.

There's some reasonable info on it here:
https://forum.corsair.com/forums/showthread.php?t=192599
and here (in German, so you'll need to translate it):
https://www.hardwareluxx.de/index.p...g-a-die-erste-eindruecke-der-16-gbit-ics.html

The long and short is that it doesn't seem to overclock very well, and it can be a challenge to make it run well if you have 4 DIMMs.
From what I'm reading, the 3600MHz kit won't go past 3200MHz on most boards if you have 4 DIMMs.

I'm trying to decide if it's worth cancelling the order, and going with the way more expensive 4x16GB 8Pack Xtreem kit.
I'm not likely to need more than 64GB, so this is one possiblity for me. It's whether I can stomach the extra £140.
 
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