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ROG MAXIMUS Z790 HERO Vs DDR5 Vengeance 4x32GB 6800

Furlooze
Level 8

Hello world !

It seems that I'm facing same issue as tons of users/gamers ... & I read a ton of different solution or workaround (even some who have downgraded to 64 instead 128 & waiting for a new firmware ?!? wtf ?

I Build 2 rendering computers , both exactly same config

ROG MAXIMUS Z790 HERO -  i9-13900k -  DDR5 Corsair Vengeance 4x32GB 6800  - Corsair MP700 2To M2 

Upgrade UEFI to 1501 

If I set UEFI "Load Optimized default" : DDR5 is detected as 3800 , desktops run smooth but obviously DDR5 benchmarks are not those expected ...

If I load XMP2 --> all settings are defined exactly as it  should ... (latency, voltage, speed,...)  but error status 77 after save settings & reboot 

Exactly same issue encounterd on both computers  

Am I missing something in UEFI settings ?

Thx !

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1 ACCEPTED SOLUTION

Accepted Solutions

Nate152
Moderator

 I can help you with some voltages and there are five voltages that will help stabilize your ram.

Here is what I would try, do you have a pencil and a piece of paper ready?

In the bios on the Ai Tweaker page...

1) Reset the bios to defaults - F5 key.

2) Set the Ai Overclock Tuner to Manual.

3) BCLK Frequency: Dram Ratio - 100:100

4) Memory Controller: Dram Frequency Ratio - 1:2

5) Dram Frequency - 5600MHz

6) Dram VDD voltage - 1.40v

7) Dram VDDQ voltage - 1.40v

8: CPU System Agent voltage - 1.275v

At the bottom of the Ai Tweaker page click Advanced voltages:

9) IVR Transmitter VDDQ voltage - 1.40v

10) Memory Controller voltage - 1.40v.

If it boots at 5600MHz, you can slowly work up the Dram Frequency until it becomes unstable, then back it down a step.

But first, how does it go trying this at 5600MHz?

 

 

 

 

 

 

 

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6 REPLIES 6

Nate152
Moderator

Hello Furlooze,

In some cases, high speed/high capacity ram will need a voltage boost.

But, in your case, it looks like you're combining two 64GB 6800MT/s memory kits. This equates to 128GB at 6800MT/s, this has not been tested or validated as a single memory kit.

You'll have to settle for a lower frequency with 128GB.

 

 

 

 

 

 

Furlooze
Level 8

Indeed I should read the qvl memory list before ... the only 128 kit supported is a Kingston ... & 5600 max ... 

for 6800, it's 2x16 Gb MAX , whatever the brand ... was not clear at all when reading system board properties 

(I need 128, lot of Vm's )

I'll try same settings as the supported kingston kit (5600)  40-40-40-80 1.25 

With a little bit luck, the chipset will be the same between these kits (SK Hynix) & it should do the trick 

Finally , as always : RTFM ! (my bad)

 

Nate152
Moderator

 I can help you with some voltages and there are five voltages that will help stabilize your ram.

Here is what I would try, do you have a pencil and a piece of paper ready?

In the bios on the Ai Tweaker page...

1) Reset the bios to defaults - F5 key.

2) Set the Ai Overclock Tuner to Manual.

3) BCLK Frequency: Dram Ratio - 100:100

4) Memory Controller: Dram Frequency Ratio - 1:2

5) Dram Frequency - 5600MHz

6) Dram VDD voltage - 1.40v

7) Dram VDDQ voltage - 1.40v

8: CPU System Agent voltage - 1.275v

At the bottom of the Ai Tweaker page click Advanced voltages:

9) IVR Transmitter VDDQ voltage - 1.40v

10) Memory Controller voltage - 1.40v.

If it boots at 5600MHz, you can slowly work up the Dram Frequency until it becomes unstable, then back it down a step.

But first, how does it go trying this at 5600MHz?

 

 

 

 

 

 

 

Dude you made my day ! It works perfectly @ 5600 with your settings , reproduced on the second workstation : confirmed

 

Launch VRAY Benchmark (CPU only) (in a hosted VM) score >25700 ! more than double than my previous rendering ws. (i9 11900k) on root OS (no VM)

Also suggested by LukeJoseph, MCE set to OFF ! --> Benchmark fall to >25700 . Negligeable so I prefer to leave it on OFF

Stress tests PassMark without any issue (Usually used to check long term cooling capabilities) 

Y-Crunch downloaded , basic tests launched succesfully, but I need to read LukeJoseph post to understand how to launch VST+VT3 multiples pass tests   

 

That's great !

I'm not sure how much headroom is left, but you can try the next highest Dram Frequency. If it fails, just back it back down to 5600MHz.

 

 

 

 

 

 

LukeJoseph
Level 10

Keep in mind there are no 4 DIMM DDR5 Kits, so XMP is not really a thing when running 4 dimms. There is some good advice already posted here, but please make sure your fully test your ram. Even if your ram is slightly unstable it may not crash windows/games but could corrupt your Windows installation over time.

Here is a link to the method that I use. https://www.overclock.net/threads/official-intel-ddr5-oc-and-24-7-daily-memory-stability-thread.1794... in my experience nothing really beats y-cruncher VST+VT3 for quick testing. But run the 5-6 passes twice, intels IMC's can be so temperamental, where you may pass 5-6 passes, close y-cruncher run it again and fail in pass 1. Also ensure you enable Intels power limits (MCE Off is fine) for y-cruncher as it can pull some significant power.