DDR5 overclocking (nightmare)

[Admin]

7600 MT/s y-cruncher stable with 7600x
u/LastUsernameWasBaned claimed it was stable in y-cruncher mixed in addition to the y-cruncher benchmark.

LastUsernameWasBaned wrote:

I didn't use DDR5 nitro option on my x670-p board. No special voltages and no CPU overclock in bios. I do CPU overclock in hydra 1.4b, which I had Patreon access when it was released.

Zenmaps shows gear down and other settings.

Nothing special in bios really. It is 1654 bios for x670-p Asus board.

If you browse my scores on hwbot you can also see my 8000mhz post there but wasn't stable at all. Just enough to post the screenshot xD

 

[Admin]

hi.. i have a corsair venegeance (CMK32GX5M2D6000Z36 )6000 mhz cl36 ram but i couldnt succed overlock it...can someone help me please?

You need to provide more information.

Both the CPU and motherboard will affect DDR5 overclocking.

If you cannot get to higher frequency you might still be able to get better performance by tweaking timings.

 

[Admin]

Going for 6600 MT/s stable with 2x32 GiB A-die
I ran into CPU stability issues with my 6461 MT/s overclock so i ended up updating to bios version A92 (msi z790-p).

I wanted to avoid the potential problems that come with BLCK overclocking so i tried 6600 instead (slightly less than 6600 in reality).

Turns out that the good settings i used earlier for my 6461 MT/s overclock will be even more useful now. Unfortunately this came at the price of using worse timing settings. I have still not found a way to get 6600 CL30 stable.

DRAM VDD: 1.40
DRAM VDDQ: 1.40
CPU VDD2: 1.38
CPU VDDQ: 1.26
CPU SA: 1.2
SA PLL SFR voltage: 0.990
MC PLL SFR voltage: 1.02

Slow training.

Read ODT training: enabled

tCL       32
tRCD      38
tRCDw     38
rRP       32
tRAS      32
tRFC2     496     

tRFCPB    432
tREFI     65528 
tWR       60
tWR_MR    60
tWTR      8
tWTR_L    12
tRRD      8
tRRD_L    10     
tRTP      12     
tRTP_MR   12
tFAW      32
tCWL      28
tCKE      8
tCCD      8
tCCD_L    12
tCCD_L_MR 12

tRDRDSG   16
tRDRDDG   8
tRDRDDR   12

tWRWRSG   16
tWRWRDG   8
tWRWRDR   16

tRDWRDG   20
tRDWRDG   20
tRDWRDR   20

tWRRDSG   64
tWRRDDG   54
tWRRDDR   14

tWRPRE    50

tXP       8
tXPDLL    16
tPRPDEN   2
tRDPDEN   8
tWRPDEN   8

tXSDLL    64

Other settings are set to auto for now.

Enabling "enhanced interleave" led to severe instability, unclear if that can be fixed since i might be up against the IMC limit at 6600. Also unclear if that even improves performance when you have 2x32 GiB DDR5.

Earlier setup with worse tREFI (52526):

https://www.youtube.com/watch?v=l08rv7jFKUg

That was with all DRAM training settings on "auto" which probably wasn't ideal.

I did have "Write drive strength/equalization" enabled for a while but that seems to make performance worse.

 

[Admin]

6600 CL30 attempt
I was never able to get this properly stable (even if i got really close) and it seemed like the cas latency was too tight with the default dram voltage (1.4v). I will return to this if i fail to get 6800 MT/s stable (unlikely).

DRAM VDD: 1.425
DRAM VDDQ: 1.41
CPU VDD2: 1.38
CPU VDDQ: 1.26
CPU SA: 1.2
SA PLL SFR voltage: 0.990
MC PLL SFR voltage: 1.02
Ring PLL SFR voltage: 1.02

BLCK 100MHz Lock On: enabled

VDD Switching Frequency: 1500Khz.

Slow training.

Read ODT training: enabled
Round trip latency: enabled
Early DIMM DFE training: enabled
DIMM RON training: enabled
Turn around timing training: disabled
Row Hammer Prevention: enabled
Write Voltage Centering 1D: enabled
Read Voltage Centering 1D: enabled
Write Voltage Centering 2D: enabled
Read Voltage Centering 2D: enabled

tCL       30
tRCD      38
tRCDw     38
rRP       32
tRAS      32
tRFC2     496

tRFCPB    432
tREFI     65528

tRRD      8
tRRD_L    10
tRTP      12
tRTP_MR   12
tFAW      32
tCWL      28
tCKE      8
tCCD      8
tCCD_L    12
tCCD_L_MR 12

tRDRDSG   16
tRDRDDG   8
tRDRDDR   12

tWRWRSG   16
tWRWRDG   8
tWRWRDR   16

tRDWRDG   20
tRDWRDG   20
tRDWRDR   20

tWRRDSG   64
tWRRDDG   54
tWRRDDR   14

tWRPRE    50

tXP       8
tXPDLL    16
tPRPDEN   2
tRDPDEN   8
tWRPDEN   8

tXSDLL    64

tMOD      50
tZQCS     98

tREFSBRD  92

100%- in hci memtest (aika memtest pro):

https://www.youtube.com/watch?v=c94ZLYAGKdw

Stable in y-cruncher, stressapptest and mprime large FFT but not stable in Testmem5 when the 1usmus_v3 profile is used:

https://www.youtube.com/watch?v=zt9B5XQjzeQ

1 error in 3 hours of testmem5:

https://www.youtube.com/watch?v=FxVTJJYASC0

 

[Admin]

2x32 GiB stable at 7800 MT/s with 7800x3d
This is actually significantly better than what raptor lake can manage. Good illustration of how bad the intel memory controller is.

This was achieved by eighty20

all switch frequency for CPU, VSOC, RAM,MISC set to maximum, all power phase are set to extreme on GENE4.

 

[Admin]

4x48 GiB @ 6000 MT/s on AM5
Impressively this was done in gear 1

Processor CA drive strength: 30 ohm
DRAM ODT impedance RTT_NOM_WR: RZQ/4 (60)
DRAM ODT impedance RTT_NOM_RD: RZQ/4 (60)
DRAM ODT impedance RTT_WR: RZQ/2 (120)
Processor ODT impedance: 48 ohm
Processor DQ drive strength: 34.3 ohm
DRAM DQ drive strength: 34 ohm

CPU_VDDIO_MEM: 1.4v
DDR_VDD Voltage: 1.4v
DDR_VPP voltage: auto (1.8v)
Vcore SoC: 1.25v

This was done thanks to reddit guide by andymetzen

Greetings from the country of Taiwan🇹🇼! It looks like we can finally run 128GB of DDR5 at the sweet spot of 6000MT/s on the AM5 platform!

I managed to find budget-friendly A-Die DDR5 sticks for $100 per 32GB, and paired them with a cheap ASRock 8-layer board priced at $250. After updating the BIOS to the latest AGESA 1.0.0.7b, I applied u/buildzoid's timings. I'm thrilled to report that my 128GB(4x32GB) setup has been 24/7 stable at DDR5-6000 30-38-38-28 UCLK=MEMCLK! I ran Memtest86 for 4 passes, LinpackXtreme for 33 runs, and AIDA64 for 4 hours, and I didn't get any errors.

128GB(4x32GB) DDR5-6000 30-38-38-28 UCLK=MEMCLK

While attempting 128GB(4x32GB) at DDR5-6400 with timings set at 32-39-39-28 and UCLK=MEMCLK, the system successfully booted into Windows. However, it didn't pass stability tests. If you're able to get 128GB stable at 6400MT/s with UCLK=MEMCLK, please share your settings!

Specs:

• Processor: AMD Ryzen 9 7950X, air cooled
• Motherboard: ASRock X670E PRO RS (BIOS: 1.28.AS01) (USD$250)
• Memory: 4x 32GB ATADA XPG LANCER RGB DDR5 AX5U6400C3232G-DCLARWH (Hynix A-Die) (USD$400)

Impossibly high aida64 number for write-bandwidth here:

Simply applying EXPO/XMP did not boot for me. The key was manually setting the following nine memory bus termination values:

• ProcOdt = 48Ω
• ProcCaDs = 30Ω
• ProcDqDs = 34.3Ω
• DramDqDs = 34Ω
• RttNomWr = RZQ/4 (60)
• RttNomRd = RZQ/4 (60)
• RttWt = RZQ/2 (120)
• RttPark = RZQ/5 (48)
• RttParkDqs = RZQ/5 (48)

Here is what I did:

1. Start at 5400 MT/s and make it stable.
2. Increase the memory speed by 200 MT/s and make it stable.
3. Repeat step 2 until you reach the limit of your system. (5600 -> 5800 -> 6000 -> 6200 -> 6400)

Expect memory training times of 8 to 9 minutes every time you make changes in the UEFI. Sometimes it might even take up to 20 minutes before entering the UEFI.

With "Memory Context Restore" Enabled and "Power Down Enable" Enabled, you should be able to access the UEFI within 10 seconds if nothing was changed in the UEFI. (In 1.0.0.7b, if you do not enable "Power Down Enable" with "Memory Context Restore," the system will fail to POST on the second boot.)

For those who desire every single detail, here is the complete list of my UEFI changes (PBO per core tuning is not included since those are chip-specific):

UEFI changes (PBO per core tuning is not included since those are chip-specific)

 

[Admin]

ODT tuning
Turns out that you may be able to push your DDR5 a bit higher by manually imputing ODT values in bios. He also confirmed that you cannot stabilize DDR5 just by showing more voltages into it, you have to find narrow sweetspots. He even found some timings to have sweetspots for reasons that are very much unclear to me (i think that was also the case with my hardware but it's hard to know for sure due to retraining variance).

For 7200/7400

rttwr: 0
rttnomrd: 48
rttnomwr: 48
rttpark: 40
rttparkdqs: 34

for 7600 CL 34

rttwr: 34
rttnomrd: 48
rttnomwr: 48
rttpark: 40
rttparkdqs: 34

CPU VDDQ = 1.3

I personally also had to manually tune CA ODT values to get dual rank stable at 6800 MT/s but i almost got it stable without resorting to that.

I did find that higher ODT values resulted in higher sweetspot voltage with regard to stability and by finding good enough settings i was able to find memory controller voltages that worked (before that no voltage i tried was stable).

 

[Admin]

6800 CL32 with 2x32 GiB A-die
I had to manually change ODT settings to pry open a window of stability with regard to voltages. I did manually tune all ODT settings except CA ODT and CK ODT which i left to auto.

ram: F5-6000J3238G32GX2-TZ5K
Motherboard: msi pro z790-p wifi DDR5
Bios version: AD3

DRAM VDD: 1.395 (1.38 during training)
DRAM VDDQ: 1.395 (1.38 during training)
CPU VDD2: 1.39
CPU VDDQ: 1.25
CPU SA: 1.155
CPU PLL SFR voltage: 1.020
RING PLL SFR voltage: 1.005
SA PLL SFR voltage: 0.975
E-core L2 PLL SFR Voltage: 0.990
MC PLL SFR voltage: 1.02
DRAM VPP Voltage: 1.77 (1.755 during training)

BLCK 100MHz Lock On: enabled

Memory Fast Boot: Slow training (later changed to "no training" to prevent retraining).

Training Mode: Intel MRC
Early Write Time centering 2: Enabled
Early DIMM DFE Training: Disabled
Write Timing Centering 1D: Disabled
Write Voltage Centering 1D: Disabled
Early Read Time Centering 2D: Disabled
TxDQ TCO Comp Training: Disabled
Read Timing Centering 1D: Disabled
Read Voltage Centering 1D: Enabled
Command Voltage Centering: Enabled
VccDLL Bypass Training: Enabled
Early Command Voltage Training: Enabled
Late Command Training: Disabled
Clock TCO Comp Training: Enabled
CMD CTL Drive Strength / Tx Equ: Disabled
CMD CTL CLK Slew Rate Training: Disabled
CMD/CTL Drive Strength Up/Dn 2D: Disabled
DIMM RON Training: Enabled
DIMM ODT Training: Disabled
Write Drive Strength/Equalization 2D: Disabled
Read Equalization Training: Enabled
DIMM DFE Training: Enabled
Read ODT Training: Disabled
Write Slew Rate Training: Enabled
PanicVttDnLp Training: Enabled
Read Vref Decap Training: Enabled
Vddq training: Disabled
Comp Optimization Training: Enabled
Read Amplifier Training: Enabled
Tx DQS DCC Training: Enabled
Write Voltage Centering 2D: Enabled
Read Voltage Centering 2D: Enabled
Receive Enable Centering 1D: Disabled
Round Trip Latency: Enabled
Read Timing Centering 1D JR: Disabled
Turn Around Timing Training: Disabled
Rank margin tool: Enabled
Rank margin tool per bit: Disabled
Write DQ/DQS retraining: Disabled
Write0 training: Disabled
Row Hammer Prevention: Disabled
Margin Limit Check: Disabled
Memory Test: Disabled

Memory Bandwidth Enhanced: [Mode 4]
A.I. Training Mode: [Mode 2]
A.I. Payload Enhance Mode: [Mode 8]
VTT ODT: [Enabled]
Enhanced Interleave: [Enabled]

ODT finetune: [2]

rttwr: 34
rttnomrd: 40
rttnomwr: 40
rttpark: 34
rttparkdqs: 34

CA ODT (CHA/D0/GA): 240
CS ODT (CHA/D0/GA): 0
CK ODT (CHA/D0/GA): 0
CA ODT (CHA/D0/GB): 120
CS ODT (CHA/D0/GB): 40
CK ODT (CHA/D0/GB): 40
CA ODT (CHA/D1/GA): 240
CS ODT (CHA/D1/GA): 0
CK ODT (CHA/D1/GA): 0
CA ODT (CHA/D1/GB): 120
CS ODT (CHA/D1/GB): 40
CK ODT (CHA/D1/GB): 40
CA ODT (CHB/D0/GA): 240
CS ODT (CHB/D0/GA): 0
CK ODT (CHB/D0/GA): 0
CA ODT (CHB/D0/GB): 120
CS ODT (CHB/D0/GB): 40
CK ODT (CHB/D0/GB): 40
CA ODT (CHB/D1/GA): 240
CS ODT (CHB/D1/GA): 0
CK ODT (CHB/D1/GA): 0
CA ODT (CHB/D1/GB): 120
CS ODT (CHB/D1/GB): 40
CK ODT (CHB/D1/GB): 40

Read ODT Duration: 5
ODT read delay: 2 (auto setting)
ODT Write Duration: 6
ODT Write Delay: 0

tCL       32
tRCD      40
tRCDw     16
rRP       32
tRAS      32
tRFC2     584

tRFCPB    424
tREFI     65528
tWR       60
tWR_MR    96
tWTR      8
tWTR_L    12
tRRD      8
tRRD_L    10
tRTP      12
tRTP_MR   12
tFAW      32
tCWL      16
tCKE      8
tCCD      8
tCCD_L    16
tCCD_L_MR 16

tRDRDSG   16
tRDRDDG   8
tRDRDDR   12

tWRWRSG   16
tWRWRDG   8
tWRWRDR   16

tRDWRDG   22
tRDWRDG   22
tRDWRDR   20

tWRRDSG   64
tWRRDDG   54
tWRRDDR   16

tWRPRE    64
tRDPRE    16

tXP       8
tXPDLL    16
tPRPDEN   2
tRDPDEN   8
tWRPDEN   12
tCPDED    16

tREFIx9   255
tXSDLL    8136

tMOD      52
tZQCS     114
tZQCAL    512
tXSR      256
tREFSBRD  106
tCSH      42
TCSL      8
tCA2CS    8
tCKCKEH   12

tRFM      292

RTL init values: 68, 66

DQ ODT Vref Dn: 10
CMD Drv Vref Dn: 5
CTL Drv Vref Dn: 8
CLK Drv Vref Dn: 5

VDD swtiching Frequency: 1250 Khz
VDDQ swtiching Frequency: 1500 Khz
VDD swtiching Frequency: 1000 Khz

https://www.youtube.com/watch?v=QPKpM-99FyY

Later i did change some CPU settings for better stability and performance:

voltage offset at ratio 24: -0.216
voltage offset at ratio 34: -0.232
voltage offset at ratio 43: -0.135
voltage offset at ratio 51: +0.004
voltage offset at ratio 54: +0.006
voltage offset at ratio 57: +0.006

It does not seem like i currently have any CPU or RAM instability and the performance is pretty good despite the limited CPU cooling (around 180W).

Older (similar) settings that got close to fully stable (failed in mprime large FFT):

https://www.youtube.com/watch?v=zC8D8rUjWqU

 

[Admin]

6400 CL28 with 7800x3d and 2x32 GiB
Nice overclock by eighty20

Nitro 1/2/0 , robust training: 8x 8x
DFE enabled, 4 tap 4 tap

 

[lucassrdev]

Hey,
How are these adjustments nowadays?
Still using 2x32gb? I have one of these Corsair sticks in an Asus Z790-F WiFi 2 and I'm having a lot of trouble stabilizing any frequency, for now it's only going to 4000mhz automatically, before I was on an Asrock Z790 PG Lightning and I managed to get up to 6800 untouched and was using 6666mhz stably.

 

[Admin]

Hey, How are these adjustments nowadays?

Still using 2x32gb?

Not much has changed really. I could update with the latest bios settings but it's realy not going to be helpful for you unless you have a msi motherboard (and even then you shouldn't expect too much).

I have one of these Corsair sticks in an Asus Z790-F WiFi 2 and I'm having a lot of trouble stabilizing any frequency, for now it's only going to 4000mhz automatically, before I was on an Asrock Z790 PG Lightning and I managed to get up to 6800 untouched and was using 6666mhz stably.

Seems like your motherboard is bad. You might be screwed basically.

I was able to overclock 400 MT/s higher thanks to updating my motherboard (msi screwed up with earlier versions) but there can also be hardware issues holding you back.

 

[lucassrdev]

Not much has changed really. I could update with the latest bios settings but it's realy not going to be helpful for you unless you have a msi motherboard (and even then you shouldn't expect too much).

Seems like your motherboard is bad. You might be screwed basically.

I was able to overclock 400 MT/s higher thanks to updating my motherboard (msi screwed up with earlier versions) but there can also be hardware issues holding you back.

Hey, admin!
I finally figured out the stupidity of my mistake. I had put the memories in the wrong slots. I finally fixed it. The Z790-F Wifi 2 is working with XMP 6400MHz in 2x32GB. Now I have 7000M at CL32 and I'm trying to find better times and voltages to make it as stable as possible. If you want to share yours again, I can try to see how much I can use it on the Asus.

 

[Admin]

Hey, admin!
I finally figured out the stupidity of my mistake. I had put the memories in the wrong slots. I finally fixed it. The Z790-F Wifi 2 is working with XMP 6400MHz in 2x32GB. Now I have 7000M at CL32 and I'm trying to find better times and voltages to make it as stable as possible. If you want to share yours again, I can try to see how much I can use it on the Asus.

Copying my exact settings isn't going to work and it's also impossible since you are on asus.

With dual rank the limiting factor is often the memory controller voltages which has to be fine-tuned for each individual CPU. I think i am still using the following

CPU VDD2: 1.38
CPU VDDQ: 1.25
CPU SA: 1.195

I think those are called something else on the asus boards

https://www.reddit.com/r/overclocking/comments/15ksqzm/voltages_naming_asus_bios_vs_hwinfo/

Edit: i did update my settings post but i don't think that will matter for anyone else and i also have not done proper stability testing yet.

 

[Admin]

Redditor got 64 GiB @ 6400CL26 stable
Passed 10 hours of karrhu ram test which is one of the harder tests to pass. This yet again illustrates how you can overclock just fine with duank rank DDR5

Lucky_Regular_ did however have to resort to pretty high voltages for this which i would personally not be comfortable with using long-term (or even short term) but maybe it's just me being paranoid.

https://www.reddit.com/r/overclocking/comments/1p43n48/

 

[Admin]

64 GiB stable @ 6200 MT/s CL26
The youtuber JohnnyRage got it stable at 1.435v

Another good result with dual rank DDR5 illustrating how it works fine with the AMD memory controllers which is in stark contrast to be bad intel memory controllers i had to deal with due to buying raptor lake (i couldn't go much higher in gear 2).

 

[Admin]

64 GiB stable @ 6400 MT/s CL26
Buildzoid aka actually hardcore overclocking delivered the goods as usual. He did however resort to high VDD voltage and had to also use a fan to keep the temperature down. He did think he could have gotten it stable at lower voltage but didn't bother.

 

[Admin]

Why 4x single rank is also bad on AM5
This is something i recommend that you avoid. Game Tech Reviews had trouble getting it stable even at 6000 MT/s in gear 1.

He had to manually set resistance/impedance values to get it to work.

ProcOdt = 48Ω
ProcCaDs = 30Ω
ProcDqDs = 34.3Ω
DramDqDs = 34Ω
RttNomWr = RZQ/6 (40)
RttNomRd = RZQ/6 (40)
RttWt = RZQ/2 (120)
RttPark = RZQ/6 (40)
RttParkDqs = RZQ/6 (40)

That really isn't much (if any) better than overclocking 4 dual rank sticks (which gives double the capacity).

Later he did report it being easy to get 6400 MT/s but that was when using gear 2 (in which case you want to go way higher).

https://www.youtube.com/watch?v=fzc5wp0S-ac

 

[Admin]

Impressive quad rank 6000 MT/s overclock ruined by power-hungry GPUs
I did run into this person on reddit and at first got the impression that they didn't know that they were talking about but they actually did know the basics at least. They were running at 5200 MT/s due to having two 600W GPUs dumping a lot of heat making what would have otherwise been a stable overclock at 6000 MT/s unstable.

I did suggest reducing the dram voltages (for the sticks themselves) and improving the heat managing in the case (or even opening it up) to keep the ram temperature down. They already have one fan over the ram but they could maybe switch to a better one. I did link to a post with impedance/resistance settings and other things for 6000 MT/s witth quad rank earlier but turned out they already knew that stuff.

dogan_yildirim wrote:

While that’s probably true and I have tuned impedances, the main killer is the gpus farting hot air into the ram. I DID get 6000 stable but as soon as those 2 600w gpus fire up all bets are off.

VSOC is currently 1.25 as I don’t want to risk cooking it over time. Im fine with 1.425 VDDQ though
It’s not that I can’t get it stable it’s the specific load conditions that cause errors.

Degradation is a real killer if you exceed FIT targets. I’ve had no issues staying within them but YMMV.

9950X3D 192GB 5200 CL28 - 5090X2 - 8TB SSD 52TB HDD

 

[Admin]

Example is overclock that is probably unstable
Seems like dono89 didn't ran any stresstesting test for the memory controller so this is probably unstable:

Don't assume it's fully stable because you can run a single test like this for like 1 hour.

Whether the instability actually matter in practice is another subject that people have disagreements about.

 

[Admin]

6400 CL28 with 96 GiB DDR5
The redditor Darian_CoC bought some nice ram before the price went up by a factor of 6.

It's taken way too long to get this thing running somewhat well-balanced.

• CPU: 9950X
  • CO: Per Core (used voltage sync method) (-14, -5, -16, -19, -18, -10, -13, -15, -20, -19, -19, -20, -19, -19, -30, -32)
  • PBO: 220/170/200
  • Scalar: 5x
  • Boost: +100
• Mobo: Aorus X870 Wifi7 Ice
• GPU: Strix 4090
  • 3045 MHz @ 1050mV
  • +1250 RAM
• RAM: G Skill Royal Neo 96GB 6000 CL28
  • Nitro is just set to Auto
  • GDM enabled
• PSU: Lian Li Edge 1000W

Cooling (custom loop):

• CPU: Modding Cafe Stealth (Optimus cold plate)
• GPU: Optimus
• RAM: Freezemod waterblock (RAM rarely gets higher than 32C)
• Radiators: 1x 420mmx30mm (push pull), 1x 360mmx30mm, 1x 360mmx45mm (external), 1x 360mmx60mm (external)
• Full copper piping

For the longest time I couldn't get the system stable when running this RAM kit at 6400CL28. Any CO changes would lead to immediate hardware failure when running AIDA64 stability test so I was running this kit at 6200CL26 instead.

Decided to try per core tuning by syncing core voltages to Core #1 (best core) while setting that core to CO -5.

As I've had it explained to me, there's probably some performance left on the table using this method but it's the only way I've been able to finally get this thing stable. AIDA64 ran for 24 hours. OCCT for another 24. Karhu for 24. Currently running TestMem.

Was able to snag top 100 for the 9950X + 4090 for Timespy Extreme and Speedway benchmarks.

If there are any glaring issues or mistakes I've made please feel free to share any advice/critiques.

https://www.reddit.com/r/overclocking/comments/1pjgqa2/finally_got_this_9950x_96gb_6400cl28_tuned_to/

The aida64 figures werent very good but aida isn't a particularly reliable bechmarking tools to begin with:

Read: 89330
Write: 97225
Copy: 85090
Latency: 67

 

[Admin]

CPU VDDIO is important on AM5
Like all other voltages too high can also cause instability even if the voltage doesn't cause any physical degradation

From dono89

It's likely that 1.33 was too high for CPU VDDIO and that the reduction of that voltage allowed for significantly better dram stability even if there are other potential explanations as well like training variance variance in the stability testing itself.