Zen+ latency penalty over 2933MHz RAM?

[uberas]

Hello, I’ve been wondering if there’s such graph for zen+ processors showing latency penalty over 2933MHz RAM or 3200, basically decoupling from the infinity fabrics?

I don’t know if I should keep my 3400cl16 or go with 3200cl14 on Ryzen 5 2600

[Sakkura]

Zen+ (and original Zen) doesn't have that DRAM:IF decoupling feature, so this behavior doesn't exist. However, instead it just can't run with as fast memory as Zen 2. DDR4-3200 is about as much as you can really count on, beyond that it gets more and more tricky.

[uberas]

2 minutes ago, Sakkura said:

Zen+ (and original Zen) doesn't have that DRAM:IF decoupling feature, so this behavior doesn't exist. However, instead it just can't run with as fast memory as Zen 2. DDR4-3200 is about as much as you can really count on, beyond that it gets more and more tricky.

I mean I’m running 3400CL16 at the minute, but CPU-Z shows like 3:53 FSB:DRAM i think so that’s why I’m asking. Are you sure that it’s not existing? I think it should be 1:1 then?

[Sakkura]

15 minutes ago, uberas said:

I mean I’m running 3400CL16 at the minute, but CPU-Z shows like 3:53 FSB:DRAM i think so that’s why I’m asking. Are you sure that it’s not existing? I think it should be 1:1 then?

FSB:DRAM is a different thing from Fclk:Uclk (fabric and memory controller clocks).

 

The FSB name is kind of a leftover from a bygone era. It doesn't mean much today. Anyway, I believe it's defined to be 2x the base-clock on Zen+, ie. 200 MHz. 200:3400 then for some reason ends up simplified to 3:53 (it ought to be 3:51, or even better 1:17).

[uberas]

Just now, Sakkura said:

FSB:DRAM is a different thing from Fclk:Uclk (fabric and memory controller clocks).

 

The FSB name is kind of a leftover from a bygone era. It doesn't mean much today. Anyway, I believe it's defined to be 2x the base-clock on Zen+, ie. 200 MHz. 200:3400 then for some reason ends up simplified to 3:53 (it ought to be 3:51, or even better 1:17).

Okay, I’ll try to jump my memory to 3733CL16 then if sky’s the limit. Thanks for help 

[nick name]

5 hours ago, uberas said:

Okay, I’ll try to jump my memory to 3733CL16 then if sky’s the limit. Thanks for help 

Most likely 3600MHz 14-15-14-14 is going to be where reliability stops.  I can get some boots with good memory training "stable" at 3666MHz and 3733Mhz.  

 

I run these timings as my daily with 1.48V on DRAM and SOC at 1.00V.  

 

You're gonna need that 3200CL14 b-die kit or better for it though.