ASUS Z790-H Board and RAM's XMP Problem

[emmreeren]

Hi,

I bought i9-14900KF, Z-790-H new motherboard and QVL supported ram Team T-Force Delta FF4D532G7800HC38DDC01. 2x16 x2 total 4 socket 64 GB Ram. I set the reset default settings (F5) and i select XMP1. Only i did XMP1 and fail F1. After, again reset default settings (F5) and i select XMP2 and fail. How can i use the 7800MHz on my ram in Z790-H motherboard? Can you help me?

[Nate152]

Hello emmreeren

Combining two memory kits is not recommended, it's best to use only a single memory kit.

Getting one 32GB (2x16GB) 7800MHz memory kit to work could be a struggle, and may need voltage tuning to achieve stability.

Here is what I would try.

1) With your pc powered down and the psu switch turned off, install one memory kit in slots A2-B2 (2nd & 4th slots from the cpu).

2) Clear the cmos with the clear cmos button.

3) Boot up, enter the bios and try XMP 1. If no go, try XMP 2.

See how it goes with one memory kit. If it doesn't want to boot or isn't stable, then you'll need to tune memory voltages.

[emmreeren]

Hello again,

• Intel i9-14900KF
  Asus Rog Strix Z790-H
  MSI RTX4070 Ti Super 3 Fan OC
  Samsung 990 PRO 2 TB
  XIGMATEK LIQUID KILLER X360

I did, as you said, 1 kit (A2-B2) with a total of 32 GB installed, I tried XMP1 and then XMP2 but it didn't work. I even lowered it to 7600 MHz and it still doesn't work. I also thank you for your quick response. Could you please share all the necessary voltage settings with me? Thank you very much again.

I also have a question. I bought 2 kits because it was on the QVL list, in short, a total of 4 RAM - 64 GB. Let's say I was able to run it at 7800 MHz with a single kit. Can I then install the other kit that is left empty? Or does 7800 MHZ only work with a single kit, with voltage settings. I don't actually want to return the other kit. What do you think the maximum MHZ I can run it at with 2 kits is. If you tell me an average MHZ, I can return the other kit or accept the MHZ drop and make adjustments accordingly. Thanks

[Nate152]

You're pushing the motherboard to its limits as it supports a maximum speed of 7800MHz. Your cpu's memory controller plays a big role in stability, even with voltage adjustments, you still may have to settle for a lower frequency.

Checking the specs of your memory, when XMP is enabled, it sets the VDD and VDDQ voltage to 1.40v.

So, try these voltages.

On the AI Tweaker Page set...

1) AI Overclock Tuner - XMP 1

2) Scroll down and enable High Dram Voltage Mode, this should be just above the Dram VDD setting.

3) Set Dram VDD voltage - 1.45v

4) Set Dram VDDQ voltage  - 1.45v

5) Set CPU System Agent voltage - 1.25v

At the bottom, click Advanced Memory Voltages.

6) Set IVR Transmitter VDDQ voltage - 1.40v

7) Set Memory Controller voltage - 1.40v

Try these voltages and see if it's stable, if not, there is room to push the voltages a little more. You can also try with a lower frequency until you find stability, this will give you an idea of where you're at.

As for running two memory kits, it may work, but you will have to settle for a much lower frequency.

[emmreeren]

Hello again,

I tried it as you said as 1 Kit but it doesn't work stably even at 7000 MHz. Only my desktop comes up, I immediately open the Prime95 test and it gives an error after 5 minutes. I myself was able to run it at 6800 MHz using 2 Kits and a total of 4 RAM. But it still fails the Prime95 test but my computer doesn't crash. I made a decision and want to use it as 2 Kits. Because they don't work at 7800 mhz with 1 Kit anyway. There is no serious difference between 1 Kit or 2 Kits, I think there is a difference of 400-600 Mhz. In short, my main goal will be to run it as 2 Kits at the highest MHz and stable version.

If I write the configuration I use 2 Kits, would you help me or suggest me on this configuration?

F5 Default Settings
XMP1 Active
DRAM and VDD Voltage: 1.45v
CPU System Agent Voltage: 1.25v
Set IVR Transmitter VDDQ Voltage: 1.40v
Memory Controller Voltage: 1.40v

I think I need to increase the latency CL values ​​of my rams a little bit since the capacity is increased. It works as 38-48-48-48-84 by default. The system works with the above settings, it slowly gives Torture Fail in Prime95 test as time passes but the system does not crash. I wonder if it will help if I increase the CL values, if so, what values ​​should I increase it to. Please correct me if I am wrong, you are a master 🙂
Thank you very much for your interest and fast answers!