XMP 1 / XMP 2 - CRASH / BLUESCREEN - Z790 DARK HERO - DDR5 4X16 6600MHZ C32

[o_TensoR]

Good morning.
I decided to get a new computer this week, but I'm having some compatibility problems between bios and rams.
I bought an Asus Rog Maximus Z790 Dark Hero motherboard and I'm using an Intel i9 14900kf processor.
In the meantime, I checked the ram compatibility for this board and processor and decided to buy some Corsair DDR5-RAM Dominator Platinum RGB 6600 MHz 4x 16 GB with the SKU code: CMT64GX5M4B6600C32
At the moment I'm having a lot of stress problems, and a lot of blue screens, when activating XMP I or XMP II in the bios.
I always get bluescreens with KMODE_EXCEPTION_NOTHANDLE errors
DXGMMS2.SYS

If I set the value to automatic, I'm running at a speed of 4800mhz and run fine, but when I set it to 6600, I start having these problems.

Another test I did was to remove 2 slots and run the test with 2x16 instead of 4x16 at 6600 and it was perfect.

Can you help in any way?
MOTHERBOARD:  ASUS ROG MAXIMUS Z790 DARK HERO

PROCESSOR: INTEL-I9 14900KF

RAM MEMORY: CORSAIR DDR5 4X16 6600MHZ C32 - CMT64GX5M4B6600C32

DISK: SAMSUNG SSD 990 PRO

PSU: SEASONIC GX VERTEX 1200

GPU: ASUS ROG STRIX RTX 4090 OC EDITION

COOLER: ICUE H170I ELITE LCD XT 420MM

[Nate152]

Hello o_TensoR

Update to the latest motherboard bios (1202) and see if this improves stability.

ROG MAXIMUS Z790 DARK HERO (asus.com)

[o_TensoR]

I have the last bios. Its the same.

Crashes, Flixs, BlueScreens, Windows errors. ALL 😄

[Nate152]

Thank you for confirming.

In that case, there are a couple ways you can go about achieving stability.

1) Lower the frequency of your memory.

2) Loosen the primary timings of your memory.

3) To keep the rated specifications, manual tune the voltages, this is what most people do.

There are five voltages that will help stabilize your DDR5 memory.

1) Dram VDD voltage

2) Dram VDDQ voltage

3) CPU System Agent voltage

4) IVR Transmitter VDDQ voltage

5) Memory Controller voltage

[o_TensoR]

Yeah, I really wanted them to work at 4x16 at 6600 cl32, it's just that I don't know how to make these manual changes.

[Nate152]

All right, I can throw out some numbers for you to try, but I can't guarantee stability. 

When X.M.P is enabled, your memory kit sets the Dram VDD and Dram VDDQ voltages to 1.40v.

So, give these a try.

1) In the bios on the AI/Extreme Tweaker page, enable High Dram Voltage Mode. This is just above the Dram VDD voltage.

2) Set Dram VDD voltage to 1.45v.

3) Set Dram VDDQ voltage to 1.45v.

4) Set CPU System Agent voltage to 1.25v. This is a finicky voltage, some cpu's don't like this voltage set too high, some cpu's might take up to 1.35v.

At the bottom of the AI/Extreme Tweaker page, click Advanced Memory Voltages.

5) Set IVR Transmitter VDDQ voltage to 1.40v.

6) Set Memory Controller voltage to 1.40v.

7) F10 and Enter to save and exit.

See how it goes with these voltages.

[o_TensoR]

I was finally able to start without receiving bluescreens with the values you indicated.

In the meantime, I ran the tests and these are the values that gave me the result.

Do you think you can improve even more knowing that the processor is an i9-14900kf?

I'm asking this because they're now at 6600, but now I'm often playing and the game crashes, or sometimes when browsing the mouse gets stuck.

[Nate152]

Excellent, good to see you're stable.

So, you want to try some overclocking eh?

You can go back into the bios, on the AI/Extreme Tweaker page, change the Dram Frequency to the next highest value.

F10 and enter to save and exit. 

If you get errors or blue screens, go back in the bios and set the Dram Frequency back to 6600MHz.

[o_TensoR]

Thanks in advance for your help.

That's what I'm going to try. 😄

When I talked about improving something, I meant increasing the CPU System Agent voltage from 1.25v to 1.35v. I don't know.

It already has 6600mhz with the 4DIMM, but sometimes it jams and takes the game down, which it wasn't doing with the 2DIMM, so maybe I'll find a way to stabilize it better.

[Nate152]

You're welcome

If games are crashing, do not raise the Dram Frequency.

As you've indicated, more voltage tuning is needed.

Trying CPU System Agent voltage at 1.30v is a good start.