Help identifying what Hynix IC's my RAM is using.

[Marcus L]

Not much else I can think of. Late Hynix DDR4 kinda all behaves the same, not much wiggle room on timings and basically nothing scales off voltage except kinda tCL (unlike 8Gb B-die that scales all the primaries + tRFC). Basically 8Gb CJR is the benchmark, 8Gb DJR is CJR but does crazy speeds and takes up to 1.6V reliably, 8Gb JJR is crappy CJR, and the 16Gb stuff like MJR or CJR still is just CJR but worse timings

This was probably the last config I had for my CJR before I sold it and the CPU, things are not as tight as they could possibly be but i wanted stability

View attachment 338708

The thing about tRFC is that it is important, but really only in big jumps. You might see an actual improvement comign down from say XMP 600ns to 150ns, but minmaxing down to 120-130ns (for B-die) is just e-peen at that point

Seems like you've got things pretty much handled already

Yea, think am probably at the upper limit of what I can get out of these, maybe having Samsung B-Die before these has tainted my expectations of what I can get out of these, but the upgrade was to go from 16GB to 32GB and I guess the trade off with that is they definitely do not play as nice or clock as high, honestly think with this board and CPU I could've got the old set to 4000mhz stable, I think double the capacity is more important than maybe 3-5 fps and a bigger e-peen however so I am guessing that bandwidth is probably more directly linked with bus speed rather than timings? as my read/write/copy were higher with my older 16GB set that ran at 3800

 

[ir_cow]

As @tabascosauz mentioned, don't forgot stability testing. Just because it boots and doesn't immediately crash, does not mean stability.

 

[Marcus L]

As @tabascosauz mentioned, don't forgot stability testing. Just because it boots and doesn't immediately crash, does not mean stability.

I know, didn't say it does

 

[Marcus L]

Finalised this today, think I am going to keep as is, have seen a small uplift in read, write and copy as well as a good improvement on the latency, I think is is as good as I can expect out of these and any more tweaking will show very minimal/no gains

Currently running tm5 for 7 minutes so far, no errors, had to up the ram voltage as it started to throw them up the first time, currently running 1.42 with 1.15v soc, if it passes I'll start lowering the ram voltage until not stable and knock it up a notch, then go back to the soc voltage and repeat

 

[Massdeth]

@Marcus L I have a 4 x 8 set of Patriot Viper RGB with Hynix IC's and im not sure which ones they are, double ?? bought them in early 21', but they seem to overclock pretty easy. If i bump the voltage to 1.365 and keep the timings they will go to 3900 stable. I am on a X299 Dark and a 10900X though so im pretty sure that accounts for some of the leeway and they say they are downbins also. Not sure if ANY of this can help you in your search but ill throw it up for ya to look at.

 

[tabascosauz]

Finalised this today, think I am going to keep as is, have seen a small uplift in read, write and copy as well as a good improvement on the latency, I think is is as good as I can expect out of these and any more tweaking will show very minimal/no gains

Currently running tm5 for 7 minutes so far, no errors, had to up the ram voltage as it started to throw them up the first time, currently running 1.42 with 1.15v soc, if it passes I'll start lowering the ram voltage until not stable and knock it up a notch, then go back to the soc voltage and repeat

That don't look bad at all. Definitely closer now to what I would have expected from CJR back in the day. So from what is probably JJR, not bad at all. Throw in Windows in not-safemode not being cooperative, and different boards being good/bad on latency.

46GB/s copy (probably the most relevant bandwidth number of the 3) is a little on the low side. Really more expected bandiwdth for 3200 not 3600. Single CCD halves write, but copy should not change, should be at least 50GB/s or so. But again, maybe windows shenanigans when not in safemode.

 

[Marcus L]

@Marcus L I have a 4 x 8 set of Patriot Viper RGB with Hynix IC's and im not sure which ones they are, double ?? bought them in early 21', but they seem to overclock pretty easy. If i bump the voltage to 1.365 and keep the timings they will go to 3900 stable. I am on a X299 Dark and a 10900X though so im pretty sure that accounts for some of the leeway and they say they are downbins also. Not sure if ANY of this can help you in your search but ill throw it up for ya to look at.

Yea these won't even go to 3800 at 1.4v they really don't have much headroom at all so it is more about getting the best timings I can and living with 3600

View attachment 339021

That don't look bad at all. Definitely closer now to what I would have expected from CJR back in the day. So from what is probably JJR, not bad at all. Throw in Windows in not-safemode not being cooperative, and different boards being good/bad on latency.

46GB/s copy (probably the most relevant bandwidth number of the 3) is a little on the low side. Really more expected bandiwdth for 3200 not 3600. Single CCD halves write, but copy should not change, should be at least 50GB/s or so. But again, maybe windows shenanigans when not in safemode.

Yes, seems low to me also from my last set even running at 3600 they would be at least 50GB/s, so I'm not sure tbh, they seem stable anyway and no errors on TM5 so I guess I can live with that, it wouldn't be a perceivable difference anyway.

 

[Massdeth]

@Marcus L ... Im sorry brotha....3800 @ 1.365......the next notch is 3999 or 4000 actually and they need to go to 1.377 to get there. I just tried it again, its been awhile since i messed with them, and i cant say 4000 is stable cause i didnt torture test it but it runs everything. TBH, theres really not much of a difference in actual use and i got to say i dont like them being there unless its for benching runs, so back to 3600 they go. Just wanted to clarify cause i dont want anyone being lead astray thinking hay this guy did it. So, onward and upward!

 

[AM4Vermeer]

Playing around with 2x 32GB sticks and 5900x. I think 60ns is optimum. Going higher than 3666 requires a lot of tuning.