ROG Maximus z790 Dark Hero - XMP issue

[NEoMax]

Intel I9-14900K

Tested with 

2 kits of  2x16 GB of Kingston Fury Renegade DDR5 8000

2 kits of 2x16 GB of Viper Gaming Xtreme5 DDR5 8000

Same outcome. XMP 1 or 2 will end up in safe mode.... I tried with several configurations ....

It only boots on 'auto' and the ram is at 3600 ....................

Thank you for your help.


14900k 6.2 GHz / 8000 CL38 / ROG MAXIMUS Z790 DARK HERO / ROG TUF RTX 4090 OG OC

[Alex_Dimou]

There is a BIOS setting called "Asus Multicore Enhancement" and by default it's on "let bios optimise". Try to change that to "enforce all limits".

[NEoMax]

I tried that with no success. It only works if I use slots a2 and b2. If I occupy more than 2 memory slots then trying XMP doesn't work....


14900k 6.2 GHz / 8000 CL38 / ROG MAXIMUS Z790 DARK HERO / ROG TUF RTX 4090 OG OC

[Alex_Dimou]

There is also another option in the BIOS settings to change the SVID to "intel's safe". Try that and see if that fixes the problem.

Other steps would be to check if both of these RAM sets are included in the qvl of the motherboard. If not, then unfortunatelly you will have to change them to sets that are included. And do not mix and match RAM sets.

If yes, then try the opposite from what i told you. Add one stick of Kingston in A2 and one stick of Viper in B2. If you get the same error then it's 100% that the problem lies within the 2 different sets of RAM. That would mean that you can't be using both of these 2 sets at the same time

[NEoMax]

Thank you for your help. I have 4 sticks of kingston and 4 sticks of Viper. I haven't tried to mix them I'm always using the same brand when testing with 4 sticks.

On the kingston website the ram I have is supposed to be compatible.


14900k 6.2 GHz / 8000 CL38 / ROG MAXIMUS Z790 DARK HERO / ROG TUF RTX 4090 OG OC

Do you know where is the qvl for my MB ?

[Alex_Dimou]

https://rog.asus.com/motherboards/rog-maximus/rog-maximus-z790-hero-model/helpdesk_qvl_memory/

[Silent_Scone]

Hi @NEoMax Use one kit, and one kit only. Not only is 8000MT not possible in the density you are trying to run, but combining or mixing kits is not supported.

Combining and mixing memory kits isn't supported by memory or motherboard vendors. If you combine memory kits, the overclocked settings in which the kit is validated for XMP/EXPO are no longer valid. Purchase a single kit validated for the density and frequency you are trying to run. This is because memory vendors bin and validate the memory kit in the density in which it is sold. Whether we combine a kit with the same part number, frequency, timings or voltage the advice remains the same.

Contrary to assumptions, XMP/EXPO doesn't ensure automatic overclocking. Tighter timings or higher frequencies may require manual adjustments for stability. Overclocking cannot be assured due to variance between parts when run outside manufacture specifications. XMP/EXPO success also greatly depends on the processor's Integrated Memory Controller (IMC) capabilities.

For better success in achieving "plug and play" overclocking, consider memory kits that are one to three frequency bins below the motherboard's maximum qualification on the QVL. The higher the frequency and tighter the timings, the more likely manual tuning might be needed to adjust for signal variance between parts. Success with memory kits at or near the top of the QVL validation table depends largely on the quality of the CPU memory controller.

[NEoMax]

So I'm lucky that I can run at 8000 with the kingston kit, I guess.


14900k 6.2 GHz / 8000 CL38 / ROG MAXIMUS Z790 DARK HERO / ROG TUF RTX 4090 OG OC

[Silent_Scone · Accepted solution]

8K is tough on 4 DIMM, hence why it's at the top of the validation table. It also needs a reasonable CPU.  Combining kits was never going to work out for you. I would return the other kits and ensure the system is stable running one kit in A2 & B2.

[NEoMax]

And there's no 4x kits above 6000 in the qvl.

14900k 6.2 GHz / 8000 CL38 / ROG MAXIMUS Z790 DARK HERO / ROG TUF RTX 4090 OG OC