3800Mhz 18-22-22 at 1.38V. However on my X570 Aorus Master , it cannot do this clockspeed at 4 sticks using F11 Bios. After update to F12G , i can do all 4 sticks 3800 CL18 stable but looser TRAS

this are my current ram timings @ 1.4v should i lower the voltage? i'm quite lost right now on how i can further make it mroe efficient.







This post has been edited by red-queen: Jun 23 2020, 09:04 PM

sorry, but what does scale negatively on higher voltages mean? higher volts get lower frequency, but lower volts get higher frequency?

Take b-dies for example, pretty much every important value (tCL, tRCD, tRP, tRFC) can be pushed higher as you raise voltage (given you stay within the acceptable temp range)
This is why you sometimes see 3800c12 @1.8V with really nice timings.
Samsung C-die is pretty much the opposite. If you get your stable setting at 1.35V and raise voltage to e.g. 1.45 it will lose stability.
And then there's dies that somewhat scale with voltage, such as Hynix C. tCL & tRFC are scaling pretty well, tRCD & tRP scale don't.

This post has been edited by nrw: Jun 23 2020, 09:56 PM

Yes, it means you might get worse timing or frequency if too much voltage.

Thanks for the info sharing. Will lower down my dram voltage to 1.35v and see whats the best i can get.

Thanks for the help guys. manage to hit 3800mhz @ 1.35v

below are the ram timings. anything i should try to improve?

have yet to play with any highly binned samsung c die but at that timing it's very close to CJR (which can do slightly tighter timing i supposed). I'd say get it totally stable 1st, then only tighten d timing from there.

after a full day testing 3800 is not stable. system doesnt crash totally, but i get stuttering. my discord sound gets disoriented and my game will flicker.

back to 3733 now.

That should be down to your IF then though.
You should have tested that first with the ram on 3200xmp .

Anyways, 3733 almost same, will serve you right until you either upgrade ram or cpu

Or both hhahahhah

Put a little higher voltage. I manage to get mine 3800Mhz stable at 1.38Vdimm.
See stable or or not. Not stable only go mess with VSOC and VDDG IOD

Hynix CJR is better than than Samsung C die for sure. At least it does scale well with voltage for CJR at 3800Mhz. Samsung C die absolutely hates voltage above 1.4V .
For CJR, it is easily doable at 16-19-19 or 16-20-20 at 3800Mhz 1.42 ~ 1.45Vdimm. TRFC below 500

C die is so damn hard to get it to tCL 16 stable at 3800Mhz. I gave up. I got stuck at CL18 no matter how I do. At least for my 8GBX2 3600Mhz CL18 G-Skill kit.

Newbie first attempt on ram overclocking here, so go easy on me pls

Here are my results after some tinkering last night and it's stable at 300% memtest just now.
MSI X570 Unify | G.Skill Trident Z Neo 3600C16 (B-die) 2x8GB | DDR4-3600 14-15-15-30-1T @ 1.41v | SOC voltage @ 1.1v (refence to owikh84 format)




I've used fast preset timings from DRAM Calculator by 1usmus v.1.7.3 with XMP imported from Thaiphoon.


Initially I tried vDIMM @ 1.35v and vSOC @ auto with safe preset timings, no go failed to boot so I had to bump up vDIMM to 1.4v, vSOC @ 1.1v.
It did boot fine and I got a little ambitious, I tried 14-14-14-28-1T with those voltage, it will boot but memtest error at around 60%.

End up punching in the current settings, and set vDIMM @ 1.41v. Passed 300% memtest but I know things can be improved.

Everything on CPU is Auto, cooled by wraith stealth while I'm waiting for some custom wc parts to arrive. Temps are high at 83c and I'm reluctant to hammer it now.

A few things that raised some question, the vDIMM readout in HWinfo is quite a bit higher than what I set in BIOS eg: vDIMM @ 1.41v in BIOS but appears to reach 1.436v in readings. vSOC is still close enough.
Another weird thing is the memtest coverage, some threads are at 400% already but some just only reach 300%, most results that I referred to had about 10-20% difference only.

Any sifu feel free to comment on it and I'll see how I can improve.

Have you tried if your 3600 is running on a 1900 FCLK?
I'd be choosing 3800C16 over 3600C14 any day.

Seeing you have the same board I do (which is brilliant for memory OC on higher frequencies btw) I can confirm that MSI loves to bump memory voltage. I'd be inclined to believe 1.436V or something very close to that is your actual voltage despite setting it to 1.41V in bios.

Memtest coverage,... maybe owihk84 or others using hci can confirm this but to me it looks like you might not have had enough free memory which is why some threads have less coverage.

I just did some tests, it's not posting at 1900 FCLK, failed the silicon lottery I guess. It's an early 2020 batch, but still not good enough for that.
1867 FCLK posted with no problem.

I see, I'll try higher frequency settings in the future. But for now, focusing on finding the right settings for normal usage.

You could play around with the VSoC, VDDG and VDDP to see if you can get 1900 FCLK running stable.

If that doesn't work out you can still just use 1867 (3733) then.
Still mostly better even if you are going for C16.

I tried applying VSoC 1.15v, VDDG 1.05v, VDDP 0.925v. Still doesn't boot.

I did try something I found online to enable LN2 mode under AMD overclocking, and then go back to set 1900 FCLK in bios, everything else auto including ram. It did boot into Windows after some struggle, but in Windows, the fabric clock was fluctuating at around 1200 FCLK only. Unfortunately the guy only mentioned good luck stabilising FCLK from there and nothing else

Maybe I'll just go back and play with 1867 (3733), it was spitting error at 3733 16-16-16-32 @ 1.42v, maybe I'll try bumping up the voltage little by little. Dram calculator suggested up to 1.48v

sometimes for voltages and stability more is less

Try 1.05-1.1V for SOC.
Try VDDG within ranges of 0.95-1.05V (synced meaning iod & ccd)
Try CLDO VDDP in ranges from 0.855 - 1.05V

Once it boots test stability by running aida64 stress cache and streaming a high resolution video at the same time.

If your usb devices/mouse is jerky that will mostly be down to VDDP/VDDG, if your sound is intermittent or fully crashes that'll be either the two above or vSOC.

Good luck. Pretty often if you are willing to spend some time there, you can find a combination of these 3 voltages that will allow your IF to run stable at a higher frequency that auto settings will allow you to.

Guys, need your help. I just bought G.Skill Trident Z Royal 3600MHz C18 16GB (2x8GB) kits (2 kits for a total of 32GB) and using it with Threadripper 2950x
Unfortunately I can never get it to run stable with the XMP profile, games always crashes

I don't OC my CPU as I'm not an overclocker just want to run everything at stock speed
Definitely not RAM issue because if I install it on my other system with Ryzen 2600X, everything runs just fine

The RAM kits: F4-3600C18D-16GTRG
https://www.gskill.com/product/165/299/1552...35V16GB-(2x8GB)

My motherboard is ASRock Fatal1ty X399 Professional Gaming running latest BIOS v3.80

Any advise? Do you think if I upgrade to 3950X with X570 motherboard it would run stable on the XMP Profile? Was originally saving my money for Ryzen 5000 + DDR5

This post has been edited by sHawTY: Jul 14 2020, 09:34 PM