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AMD DDR5 OC And 24/7 Daily Memory Stability Thread

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Discussion starter · #681 ·
CyrIng said:
However CMD Rate bit(s) have moved in register since DDR5.
Do you validate Tool reflects what's left in BIOS ?
Click to expand...
The latest Zen Timings and the AM5 MemTweakit detect it properly.

AM5 Bios and Tools

ASRock: BIOS: B650 PG Lightning: 1.07AS02 B650 Pro RS: 1.07AS03 B650M PG Riptide: 1.07AS02 X670E PG Lightning: 1.07 X670E Steel Legend: 1.07 X670E Taichi: 1.07 OC Tools: Blazing OC Tuner ASUS: ROG CROSSHAIR X670E HERO BETA BIOS 0802 ROG CROSSHAIR X670E GENE BETA BIOS 0802 ROG CROSSHAIR X670E EXTR...
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#682 ·
Actually it shifts @ & past 6200 to 2T - where both remain bits are kind of wrong
They are moved
Nobody can verify what is correct, hwinfo/benchmate
or SMU access which has then GDM wrong
 
#683 ·
Veii said:
Actually it shifts @ & past 6200 to 2T - where both remain bits are kind of wrong
Click to expand...
Can confirm, have a latency jump when going up to the 6400MT/s memory strap from 6200MT/s, while keeping everything else the same

Funny thing is that latency is fine when using the 6200+2133 trick which effective gives 6400MT/s memoryspeed
 
#684 ·
KedarWolf said:
You need to message ASRock support and have them mod your BIOS to include Gear Down Mode Disabled.

I only have Taichi ones.
Click to expand...
Oh right, well it might work already then, I haven't tried it yet with a AGESA 1.0.0.4 BIOS, which added gear down mode options for my board.
 
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#685 ·
I tried clocking my DRAM @ 6200 MT/s got about 55ns in AIDA54, roughly 1 ns lower than running at 6000 MT/s.

The command rate was now reported as 1t. The memory and memory controller clocks were both reported as 3100 Mhz.

The last time I tried this on my previous BIOS, recorded latency was definitely worse.

After a few minutes I got a crash in Windows 11, so I think it probably needs more SOC voltage for stability, as I kept it at 1.3v.

Maybe I'll try that some other time...
 
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#689 · (Edited)
InfiniteScaling said:
Hey everyone!

I just got my CMT64GX5M2B5600C40 kit and it's Samsung (although ASUS/MSI/Gigabyte QVLs and some other lists indicated them being M-Dies when I picked them up).

Are there any good presets/starting points/tips to start overclocking these? My main target is to get them to 6000/6200 MT/s with some decent timings and voltage on a 7950x.
Most information that I can find is Hynix M-Die specific.
Click to expand...
I have an Samsung die as well, there some limitation (atleast on my RAM) for TRFC and TREFI compared to Hynix but should still be good enough/better than stock.

Just realised yours is 64gb (32x2), so not sure if these will work for you as my QVL was 5600C36 (16x2)
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#690 ·
MrPhilo said:
I have an Samsung die as well, there some limitation (atleast on my RAM) for TRFC and TREFI compared to Hynix but should still be good enough/better than stock.

Just realised yours is 64gb (32x2), so not sure if these will work for you as my QVL was 5600C36 (16x2)
Click to expand...
Thanks for the info!

From the progress that I've made so far, it seem like my timings need to be a lot more loose. Around 36-38-38-88-126 at 6200 MT/s, but I guess it's expected since my kit is a 5600CL40 and not a CL36 one after all.
2x32 DR seems to also put more pressure on the memory controller, so anything past 6200 is unstable because of the IMC (at least for my CPU). The kit itself seems to be capable of 6400 MT/s though.

I still have more work to do to stabilize things, so I'll post an update once done :)
 
#691 ·
To make my RAM run at it's rated speed, I had to buy a new 7950x. I had a SP115 and the new chip is SP116. With the SP115, I could not get any RAM to run over 4800MHz. With the SP116, I installed the chip, reset the BIOS, booted into BIOS, set to EXPO I and it booted right up.

Stable as can be with GSkill F5-6000J3038F16GX2-TZ5NR kit. Have to tighten things up to get latency down a bit. But otherwise, perfect!

Now that I have something to work with, I'm gonna try to get this to run as well - Team Group FF3D532G6400HC40BDC01

If you cannot get your RAM stable above 4800MHz, check your processor.
 
Discussion starter · #692 · (Edited)
A-Die DDR5@6398MHz 30-37-37-34-27-36 1T Gear Down Mode Disabled -
Karhu 296MB/sec -
AIDA64 52ns 94k+ read 100k+ write 87k+ copy -
25 cycles TM5 and 10000% Karhu stable.

Me and someone else with a Taichi get worse AIDA64 with 6400MHz and 2167. It seems to be bugged for us. :(

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Discussion starter · #695 ·
Reous said:
Could you also add your VDD/Q voltages and if known the VDDG voltages please?
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Do I need to run all the tests again or is the additional BIOS screenshot I added to the post okay?
 
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Discussion starter · #697 ·
Reous said:
That added screen is alright, thanks. Do you really need that high VDDG voltages?
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Yeah, I do. I get errors in TM5 and Karhu lower.
 
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#698 ·
Any suggestions to tune this up would be appreciated. I'm not looking to push a bunch of voltage through the IMC so I was planning on getting the best performance I can with basically EXPO enabled and tuned sub timings. Basically all I've done is just adjust tras to 32, trp+tras = 70 for trc, trfc to 480 then calculated trfc2 and trfcsb off of trfc (I'm assuming trfcsb is just trfc4 from am4), locked in trdwr and twrrd in bios because they were different on auto for each stick, and turned up trefi to 65000. Running g.skill flare x5 6000c32 hynix m-die. This is the best I've gotten so far. Pretty good latency wise considering I've barely touched anything but obviously I can get more out of it. Thinks for any pointers you guys can give me. Used to intel which is easy as there's way more straight forward known good tutorials out there.
7700x
ASUS B650E-F Strix
2x16gb g.skill 6000c32
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#699 ·
HOODedDutchman said:
Any suggestions to tune this up would be appreciated. I'm not looking to push a bunch of voltage through the IMC so I was planning on getting the best performance I can with basically EXPO enabled and tuned sub timings. Basically all I've done is just adjust tras to 32, trp+tras = 70 for trc, trfc to 480 then calculated trfc2 and trfcsb off of trfc (I'm assuming trfcsb is just trfc4 from am4), locked in trdwr and twrrd in bios because they were different on auto for each stick, and turned up trefi to 65000. Running g.skill flare x5 6000c32 hynix m-die. This is the best I've gotten so far. Pretty good latency wise considering I've barely touched anything but obviously I can get more out of it. Thinks for any pointers you guys can give me. Used to intel which is easy as there's way more straight forward known good tutorials out there.
7700x
ASUS B650E-F Strix
2x16gb g.skill 6000c32
View attachment 2591572
Click to expand...
You could try mine, personally think my 6000C30 is the most loose compared to most 6000C30 as they call can get lower tRFC and tREFI and it only uses 1.34v for me, so quite low voltage imo for what its pushing out. So you could keep your default for tRFC and tREFI and try out the subtiming.

Enable GDM if its not stable for you though. You don't have to copy my RTT, they're Auto mode than ProcODT which was also 60 for me but I lowered it to 43.6


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#700 ·
MrPhilo said:
You could try mine, personally think my 6000C30 is the most loose compared to most 6000C30 as they call can get lower tRFC and tREFI and it only uses 1.34v for me, so quite low voltage imo for what its pushing out. So you could keep your default for tRFC and tREFI and try out the subtiming.

Enable GDM if its not stable for you though. You don't have to copy my RTT, they're Auto mode than ProcODT which was also 60 for me but I lowered it to 43.6


View attachment 2591579
Click to expand...
Yours is samsung tho isn't it? Probably not the best idea to copy samsung settings for my hynix kit. Most of it would probably work but I know some settings can be quite a bit different. Tbh the main performance gain you have over me is probably just the fact you have 1t with GDM disabled. At least latency wise. Read/Write/Copy is obviously going to be better since you're on a 7900x and I'm on a 7700x. Guessing that's because of the CCD layout?
 
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