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AMD DDR5 OC And 24/7 Daily Memory Stability Thread

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#8,823 ·
Aight so I'll grab some generic 4800C40 stuff from the office stash tomorrow so I can at least get my system up and running to test this 100 bucks ex RMA board lol.

I ordered some AData XPG Lancer 2x16 7200C34's which will hopefully show up.. shop said in stock when I ordered them but now they are gone from the website so let's just hope I got the last set.

What are the odds the 7800X3D and Prime X670-P will just run EXPO stable for initial testing? And if it doesn't what (voltages?) should I tweak first? I'm very well versed in AM4 / DDR4, especially b-die OC, but know nothing about AM5 / DDR5..

It would be fun to see how high I can push some generic Dell Intel 12th gen workstation 4800C40 stuff tbh. Might play around with those a bit too.
 
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#8,824 · (Edited)
Nilo said:
I had to quit from 8000 goal, because it's unstable and too much heat on ram sticks.
Now, I'm going for 7800, and I'm liking the results I'm getting as stability seems a bit more closer, although I keep getting errors.

I'm getting this error but I don't understand it.
I have already read info available concerning the errors causes and possible solutions but I cannot figured out.

Can you help me?

View attachment 2628625


My figures are below and they are not final.

I have still much heat on ram sticks, no?
Is mem vdd value too much for 7800?
I don't have a clue about Trfc value that I should use.
Can you help me suggesting a better approach to tune my figures towards stability running ram on 7800mhz?

Many thanks
Click to expand...
You need VDD 1,55 - 1,57 Volt for 8000\CL34. 1,45 Volt is way to low.
But only possible with fan(s) and/or watercooling.
 
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#8,825 · (Edited)
ASUS X670E Extreme 2dpc 2x24GB M-Die (the new Hynix M-Die) 8200CL40 kit @ 8000CL34. Now have the fun game where some days it works, some days it doesn’t and seems to need to be off at the wall for hours to toggle between the two. When it works Karhu 20k%, TM5 1usmus x25, MemTest86 (sanity check before booting Windows) and y-Cruncher 20x iterations of FFT all work fine.

Can do 7800CL32 with GDM off, however 8000 no matter how slack the timings, the DIMM in B2 (even when swapped) produces all the the errors according to MemtestPro’s per DIMM detection with GDM Off (not a problem with GDM On).

Having to go back to 1:1 as cba with coin toss stability.

PS moving from G.Skill 6000CL30 to 8200CL40 kit at 1:1 there’s some nice timing improvements. tRDWR 16->13, tRCD 38->37, tWRTS 6->3, tWRWRSCL 4->1, tRRDS 8-> 6 and tRDRDSCL 6->4. Still not fully tuned in but was able to reduce those timings stable without additional voltage.
 
#8,826 ·
First year doing OC and started submitting test scores to HWBOT..... results speak for themselves. Thanks to the many here that spent hours learning and sharing their findings. Not that I'm a serious OC but I do enjoy the challenge.....here's my current Hwbot rankings, might not mean much but for me it does as this is a result of various test and not just ram related. I will say CPU OC has a huge impact on ram latency!. I gained about 2ns with cpu tuning.
 

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#8,827 ·
metalshark said:
ASUS X670E Extreme 2dpc 2x24GB M-Die (the new Hynix M-Die) 8200CL40 kit @ 8000CL34. Now have the fun game where some days it works, some days it doesn’t and seems to need to be off at the wall for hours to toggle between the two. When it works Karhu 20k%, TM5 1usmus x25, MemTest86 (sanity check before booting Windows) and y-Cruncher 20x iterations of FFT all work fine.

Can do 7800CL32 with GDM off, however 8000 no matter how slack the timings, the DIMM in B2 (even when swapped) produces all the the errors according to MemtestPro’s per DIMM detection with GDM Off (not a problem with GDM On).

Having to go back to 1:1 as cba with coin toss stability.

PS moving from G.Skill 6000CL30 to 8200CL40 kit at 1:1 there’s some nice timing improvements. tRDWR 16->13, tRCD 38->37, tWRTS 6->3, tWRWRSCL 4->1, tRRDS 8-> 6 and tRDRDSCL 6->4. Still not fully tuned in but was able to reduce those timings stable without additional voltage.
Click to expand...
welcome to Asus 2DPC club
 
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#8,828 · (Edited)
ZhenyaUsenko said:
DDR5 Nitro Mode --- Enable
DDR5 Robust Training Mode --- Enable

Nitro RX Data --- 1
Nitro TX Data --- 2
Nitro Control Line --- 0

Nitro Rx Burst Length --- 8X
Nitro Tx Burst Length --- 8X
Click to expand...
Thx i set those , btw what are the settings do ?
6400 cl28 still unstable .I bet the 1,45V VDD / 1,45 VDDQ not enough. But i gained 1,5ns boost , from 60,7 to 59.1 after the Nitro settings you mentioned (y)
 
#8,831 ·
fray_bentos said:
No such thing as "negative temperature". Over 1.30 V on SoC risks damaging your CPU. 1.45 V on SoC WILL destroy your chip; it is just a matter of time.
Click to expand...
What makes you so sure saying that?
 
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#8,832 ·
DedEmbryonicCe1 said:
Did you experience BCLK making your RAM unstable? I've tried 101.9, 101.7, 101.5, 101.1, 100.6 MHz all make my RAM fail MemTest.
Click to expand...
If you use eclk ram clock isn't touched, if you use bclk, it's literally multiplied by the value you type in (i.e. 1.02 x 6400 = 6528, as well as fclk - 1.02 x 2166 = 2209), so keep that in mind.
 
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#8,833 ·
ZhenyaUsenko said:
You will need more voltage for CL28. As I can see from your screenshot, you are currently running 1.4V.
I would recommend trying to disable GDM first (set ADDR_CMD_MODE to Buf) before tightening up further.
Click to expand...
Yes i run 1,4 / 1,4 vdd ,vddq for daily 6400 cl30 . but i triedd 1,45 /1,45 cl28 too.
Thx for the advices , i will try them later :giggle:
 
#8,835 ·
Word_Up71 said:
You need VDD 1,55 - 1,57 Volt for 8000\CL34. 1,45 Volt is way to low.
But only possible with fan(s) and/or watercooling.
Click to expand...
Thank you.
It's too much heat in my rig.

For 7800, what are your voltages?

Right now, I have PC running on 7400mhz / VDD 1.45 / VDDQ 1.4.

I had to enable HV in bios. When I return to bios, HV is always disabled. I have to turn it on each time I get in bios. Do you know why this happens? Is it a bug?
 
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#8,836 · (Edited)
Hi.

A relative DDR5 overclocking n00b here. I have the following RAM, mainboard and CPU:

RAM: F5-8000J4048F24GX2-TZ5RS
MB: ASUS ROG STRIX X670E-A
CPU: 7800X3D

I can run 8000Mhz with XMP, but what kind of timings, voltages do I need to tighten it up without "crazy"voltages? 8000Mhz is really giving me headache's for stability.

Can a kind soul that has solved this riddle give post of all their settings and voltages for a stable 24/7 setup so I can use that as a baseline?
 
#8,837 · (Edited)
FranzJeger said:
Hi.

A relative DDR5 overclocking n00b here. I have the following RAM and mainboard:

RAM: F5-8000J4048F24GX2-TZ5RS
MB: ASUS ROG STRIX X670E-A

I can run 8000Mhz with XMP, but what kind of timings, voltages do I need to tighten it up without "crazy"voltages? 8000Mhz is really giving me headache's for stability.

Can a kind soul that has solved this riddle give post of all their settings and voltages for a stable 24/7 setup soI can use that as a baseline?
Click to expand...
Would suggest testing for stability at 8000MT/s (4000MHz) first.

Tm5 with 1usmus loaded for 25 cycles (you need to edit the config file for 1usmus to say 25 cycles then load it in Tm5). There are better stress tests but this one gives you at least hints of what to fix by tracing back the errors.

Then Karhu set to as many threads as you have (16 on 7800, 24 on 7900 and 32 on 7950) with nearly as much memory as you have free. Get to 20000% without errors.

Finally y-Cruncher (a lot of people like installing BenchMate to get y-Cruncher but you're free to just get it on its own). Running a FFT stress test for 20 iterations.

Once you're sure it's actually stable would post a ZenTimings screenshot here so people can wade in on what to try.
 
#8,838 ·
metalshark said:
Would suggest testing for stability at 8000MT/s (4000MHz) first.

Tm5 with 1usmus loaded for 25 cycles (you need to edit the config file for 1usmus to say 25 cycles then load it in Tm5). There are better stress tests but this one gives you at least hints of what to fix by tracing back the errors.

Then Karhu set to as many threads as you have (16 on 7800, 24 on 7900 and 32 on 7950) with nearly as much memory as you have free. Get to 20000% without errors.

Finally y-Cruncher (a lot of people like installing BenchMate to get y-Cruncher but you're free to just get it on its own). Running a FFT stress test for 20 iterations.

Once you're sure it's actually stable would post a ZenTimings screenshot here so people can wade in on what to try.

If
Click to expand...
Ok. I will do that. Thank you so much for the quick response.
 
#8,839 ·
Nilo said:
I had to enable HV in bios. When I return to bios, HV is always disabled. I have to turn it on each time I get in bios. Do you know why this happens? Is it a bug?
Click to expand...
Maybe a bug in the motherboard bios? It maybe also that your Ram pmic can’t do HV mode.

Enable HV mode set 1.5vdd then save and then boot to OS and run HWINFO64 and check voltages on DDR5 DIMM VDD voltage and see if it is indeed 1.5vdd.
 
#8,840 ·
FranzJeger said:
Ok. I will do that. Thank you so much for the quick response.
Click to expand...
And very important, if you find stability, retry stability tests (mainly Karhu’s) after a reboot.
You may have bad surprises.
 
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