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Zen 2/3 & RAM overclocking

JD

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Only thing I can see is that your timings are pretty loose in comparison to mine and lowfat's. Are those the timings the calculator spat out for you?
 

sswilson

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No, unfortunately the timings in the calculator did not work for me. Those timings are tweaked XMP settings.

Hopefully I'll have better luck with the XMP D50 kit I've got coming in.

That said... 20GB/s seems like an awfully high difference.
 
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sswilson

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Just started the initial run on the XPG D50s with the default XMP (3600 / CL18) , and it's already reporting back a read speed of 40+ GB/s which is a significant improvement over the single rank balistix I returned (as well as the GSkill 2X8 SR I've been running).
 

sswilson

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It's interesting how this board/platform reacts to overly aggressive mem timings. The first obvious indication of instability on timings that will boot into windows is degraded audio output.

edit: Without digging deeper and attempting to tweak individual settings from the dram calculator settings it's stable @ 3600 cl16 "safe" settings, but not the "fast" settings.
 
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sswilson

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Hrmmmm.....

3900XT CAS 18.png

That's the new set of D50s on a gigabyte X470 Aorus Gaming 7 @ CAS 18 / 3600 (not having any luck at all bumping up from XMP)

3700X CAS 16.png

That's a different set of D50s on a B550 Tomahawk @ CAS 16 / 3600.

Relatively large difference in Read speed (considering the faster is CAS 18 vice 16) but what really stands out to me is the fact that the first on is close to synchronous between read and write, while the write speed on the second is majorly gimped.

Could there be that big of a difference in memory throughput between B550 / X470, or even between the 3700X and 3900XT?

Aside from that, I guess I really have to get a second look at the memory settings on the B550 board.
 

JD

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I think we saw the same between @lowfat 5600X and my 3900X at the time too, probably due to being a single CCD.
 

iSimple

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Just posting my OC

G.Skill F4-3600C16D-32GVKC Dual Rank Memory Hynix CJR chips
Stock XMP 3600MHz 16-19-19-39 @ 1.35V
OC'd 3733MHz 16-19-21-36 @ 1.37V

3423.PNG
 

lowfat

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This is not too bad for preliminary fooling around with the 5600G. CPU and GPU frequency untouched and RAM at mildly tweaked 3600 XMP timings. Samsung B-die Tridents (20nm) like to play along it seems. We'll see where this goes and let the good times roll.:)


View attachment 32744
How much voltage? You can safely use 1.5V w/ b-die as long as there is some air flow over them.

I think you can go tighter. :p
 
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