AMD DDR5 OC And 24/7 Daily Memory Stability Thread

dhnguyenit · Jan 15, 2023

Dueprocess said:
Any tips to lowering tRRDS / tFAW and tWRWRSCL? Are there other timings they are dependent on or tied to?

The attached is the best I can do while maintaining stability through overnight runs of Memtest. (I can boot, run benchmarks, etc. with tRRDS at 4 / tFAW at 16 and tWRWRSCL at 8, but I hit failures in Memtest rather quickly.) My read / write speeds are pretty constrained as a result. (Note this is just running a 7600x while I wait for x3D -- is it a CPU constraint?)

I have two sets of G.Skill M-Die (I believe), and it doesn't matter which combination of sticks I pair re: timings, etc.

View attachment 2594334

Read on CCD1 CPU < 70k always.
RRDSCL/WRWRSCL/FAW 8/8/32 works?

Dueprocess · Jan 15, 2023

dhnguyenit said:
Read on CCD1 CPU < 70k always.
RRDSCL/WRWRSCL/FAW 8/8/32 works?

I am stable for 12 hrs of memtest with:
RDRDSCL = 8
WRWRSCL = 23
FAW =32

But, if I drop WRWRSCL below 23 I get errors in under 10 minutes.

dhnguyenit · Jan 15, 2023

Dueprocess said:
I am stable for 12 hrs of memtest with:
RDRDSCL = 8
WRWRSCL = 23
FAW =32

But, if I drop WRWRSCL below 23 I get errors in under 10 minutes.

Maybe caused by volate? Adjust RTTnoms, and I need 1.35v vsoc for 6400, 1.3v is not stable for me.

a3a3e11o · Jan 15, 2023

Dueprocess said:
Any tips to lowering tRRDS / tFAW and tWRWRSCL? Are there other timings they are dependent on or tied to?

The attached is the best I can do while maintaining stability through overnight runs of Memtest. (I can boot, run benchmarks, etc. with tRRDS at 4 / tFAW at 16 and tWRWRSCL at 8, but I hit failures in Memtest rather quickly.) My read / write speeds are pretty constrained as a result. (Note this is just running a 7600x while I wait for x3D -- is it a CPU constraint?)

I have two sets of G.Skill M-Die (I believe), and it doesn't matter which combination of sticks I pair re: timings, etc.

View attachment 2594334

First test FCLK with OCCT 1h Large+Extreme+Variable+AVX2.
So high latency for this settings. Are you sure that your 2200 fclk doesn't throttle?

Rectangle Font Handwriting Parallel Screenshot

Dueprocess · Jan 16, 2023

a3a3e11o said:
First test FCLK with OCCT 1h Large+Extreme+Variable+AVX2.
So high latency for this settings. Are you sure that your 2200 fclk doesn't throttle?

View attachment 2594381

Thanks for the help. I am stable at the attached. I can't drop tRFC below 512 or I eventually get errors.

Any advice re RFC2 / RFCsb? Is there a formula to determine timing re: RFC (or do they have a relationship to some other timing), or should I just aim for as low as I can go?

Font Screenshot Rectangle Electronic device Software

a3a3e11o · Jan 16, 2023

Dueprocess said:
Thanks for the help. I am stable at the attached. I can't drop tRFC below 512 or I eventually get errors.

Any advice re RFC2 / RFCsb? Is there a formula to determine timing re: RFC (or do they have a relationship to some other timing), or should I just aim for as low as I can go? View attachment 2594604

What VDD and VDDQ? For fclk 2133 probably vSOC 1.30 - 1,35 enough

Dueprocess · Jan 16, 2023

a3a3e11o said:
What VDD and VDDQ? For fclk 2133 probably vSOC 1.30 - 1,35 enough

1.435 at the moment. I might be able to drop a little lower (working my way down).

I tried dropping CL to 28, but couldn't maintain stability at VDD/Q at 1.48, and I wasn't comfortable pushing them much harder for 24/7.

dhnguyenit · Jan 16, 2023

Dueprocess said:
Thanks for the help. I am stable at the attached. I can't drop tRFC below 512 or I eventually get errors.

Any advice re RFC2 / RFCsb? Is there a formula to determine timing re: RFC (or do they have a relationship to some other timing), or should I just aim for as low as I can go? View attachment 2594604

trfc 512 is still high. If you got errors but can still boot, maybe try loosening other timings and try to get lower trfc stable? There are many equation for trfc2, but look like there is no best one, and look like trfc2 trfcsb not affect much.

Can try :

Set fclk to 2000 to avoid cpu related stability.
loosening rrds faw and tighten trfc.
tighten rrds,rdrdscl, faw, wrwrscl
try to get lower voltages.

My 6400 config at 1.4v, not comfortable with more than 1.43v

a3a3e11o · Jan 16, 2023

Dueprocess said:
1.435 at the moment. I might be able to drop a little lower (working my way down).

I tried dropping CL to 28, but couldn't maintain stability at VDD/Q at 1.48, and I wasn't comfortable pushing them much harder for 24/7.

tRRDS 8 tRRDL 8 tFAW 32 tRFC 496
tRAS = tRCD + tRTP 58 in your case
tRC = tRAS + tRP 96 in your case

If you think that set lowest possible timings give you best result you are wrong.
Every time It is necessary to check whether the change improved the result

artemuss1990 · Jan 16, 2023

What vdio voltage you use for 6400? My 7950x can't work even on 6200 with vdd/vddq/vdio 1.4, soc 1.35, vddp 1.15, vddg both 1.2. FCLK cann't over 2000, on 2033 uclk auto set to 3100 and errors on ram test, 2066 dont change uclk but pc some time ramdom reboots (need more 1.35 soc or vddg?). What the bad mc my cpu have. Now stopped at 6000 ram with fclk 2000. Ram KINGSTON FURY Renegade RGB DDR5 6400MHz 32GB

a3a3e11o · Jan 16, 2023

artemuss1990 said:
What vdio voltage you use for 6400? My 7950x can't work even on 6200 with vdd/vddq/vdio 1.4, soc 1.35, vddp 1.15, vddg both 1.2. FCLK cann't over 2000, on 2033 uclk auto set to 3100 and errors on ram test, 2066 dont change uclk but pc some time ramdom reboots (need more 1.35 soc or vddg?). What the bad mc my cpu have. Now stopped at 6000 ram with fclk 2000. Ram KINGSTON FURY Renegade RGB DDR5 6400MHz 32GB

KINGSTON FURY Renegade is Hynix M, some timings are too tight, possibly causing instability.
1) Set defaults with XMP, vSOC ~1.3 to ~1.375, VDDP ~1.05 - ~1.15, FCLK 2133, 1:1, memory 64, vdd/vddq 1.43 and test fclk and uclk stubility with OCCT 1h Large+Extreme+Variable+AVX2
2) After that tune timings for 6400 16 Gb

CL
RCD
RP
RAS	RCD + RTP
RC	RAS + RP
RRDS	min 8+
RRDL	min 8+
FAW	min 32+
WTRS	min 4+
WTRL	min 16+
WR	CL + WTR_ (highest) + 8
RFC1
RFC2	RFC/1,84375
RFCsb	RFC/2,26923
RDRDSCL	min 8+
WRWRSCL	min 4 (8)
CWL	CL-2
RTP	min 12+
RDWR
WRRD	1+
RDRDSC	1
RDRDSD	1+
RDRDDD	1+
WRWRSC	1
WRWRSD	1+
WRWRDD	1+
REFI	43680+

Savitarax · Jan 16, 2023

Hey am I missing something? My Hynix A-die kit can be overclocked to ridiculous timings. I intentionally disabled ECC and ran OCCT/Ycruncher for over an hour and it passed.
I'm confused cause these timings seem way to tight to be stable. But I haven't crashed or encountered any errors.
28-33-33 seems like a nice overclock though with 50TRFCPB AND 366 TRFC

a3a3e11o · Jan 16, 2023

Savitarax said:
Hey am I missing something? My Hynix A-die kit can be overclocked to ridiculous timings. I intentionally disabled ECC and ran OCCT/Ycruncher for over an hour and it passed.
I'm confused cause these timings seem way to tight to be stable. But I haven't crashed or encountered any errors.
28-33-33 seems like a nice overclock though with 50TRFCPB AND 366 TRFC

Hynix A holds tighter timings than Hynix M.
Most of rules by Jedec.

Savitarax · Jan 16, 2023

a3a3e11o said:
Hynix A holds tighter timings than Hynix M.
Most of rules by Jedec.

oh I thought it was the other way around?
Wasn't everyone saying to get M-die for tighter timings than A-die?

feinmakulatur · Jan 16, 2023

Hello,

I am trying to get the most out of my Corsair Vengeance on my X670E Aorus Master. If I lower my timings more, I cannot boot and sometimes have to reset my BIOS. Does anyone have an idea if and where is room for improvement?

Thanks a lot!

m411b · Jan 16, 2023

Savitarax said:
Hey am I missing something? My Hynix A-die kit can be overclocked to ridiculous timings. I intentionally disabled ECC and ran OCCT/Ycruncher for over an hour and it passed.
I'm confused cause these timings seem way to tight to be stable. But I haven't crashed or encountered any errors.
28-33-33 seems like a nice overclock though with 50TRFCPB AND 366 TRFC

Is 1.95v on MEM VPP OK for 24/7 use?

I thought I read here somewhere that high will char/burn the little finger leads on the RAM. Or did I read wrong?

Savitarax · Jan 17, 2023

m411b said:
Is 1.95v on MEM VPP OK for 24/7 use?

I thought I read here somewhere that high will char/burn the little finger leads on the RAM. Or did I read wrong?

I mean this was the auto value my motherboard supported
So i Assume it's safe, especially since I ran it for 1 hour at 52c on the sticks

dhnguyenit · Jan 17, 2023

m411b said:
Is 1.95v on MEM VPP OK for 24/7 use?

I thought I read here somewhere that high will char/burn the little finger leads on the RAM. Or did I read wrong?

VPP is not VDIMM. VPP can be safe up to 2.2v, though I see it doesn’t impact much to change this,

dhnguyenit · Jan 17, 2023

Savitarax said:
oh I thought it was the other way around?
Wasn't everyone saying to get M-die for tighter timings than A-die?

Some M die can go lower trfc (bulldoze can set 333 trfc), while A die can’t go lower than 120ns (you’re running 122ns).

Savitarax said:
Hey am I missing something? My Hynix A-die kit can be overclocked to ridiculous timings. I intentionally disabled ECC and ran OCCT/Ycruncher for over an hour and it passed.
I'm confused cause these timings seem way to tight to be stable. But I haven't crashed or encountered any errors.
28-33-33 seems like a nice overclock though with 50TRFCPB AND 366 TRFC

Trfcsb can be set to 0 and it still boots, look like this value is not used or delta idk.
Can you run Aida64 and do latency tests to see if the timings are good for cl28? Sometimes too tight timing can result in worse results because of auto correction.

simonabamber · Jan 17, 2023

Does anyone know why my memory overclock would crash my computer (straight to black screen) when opening chrome? Went back to expo timings and voltages and it’s stable.

where to start

edit, testmem 100% passing, OCCT no errors - just chrome!

AMD DDR5 OC And 24/7 Daily Memory Stability Thread

dhnguyenit

Dueprocess

dhnguyenit

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artemuss1990

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