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Intel i9-12900K with 4x32GB DDR5 won't boot with XMP@5600MHz (But 2 does)


Hello guys, greetings. I hope you can guide me and help me.

I have an Intel i9-12900K CPU on an Asus Maximus Z690 Hero with 2 Kits of 2x32GB Kingston Fury Beast DDR5 5600MHz (KF556C40BBK2-64).

I am having trouble getting my PC to boot using the XMP @ 5600MHz with 4 dimms installed. With 2 dimms installed, there's no problem at all, but when I install the other 2, the PC won't boot (Ambar led, code 55).

On the internet I found the following setting in BIOS with which I was able to use the XMP profile @ 5600MHz with 2 dimms without any issue:

  • Ai Overclock Tuner: XMP I
  • DRAM VDD Voltage: 1.375v
  • DRAM VDDQ Voltage: 1.375v
  • Advanced Memory Voltage / PMIC Voltage: By Per PMIC

But that same settings no longer works when installing all 4 dimms.

I hope you can help me. Thank you very much in advance for your time and help.


  • All 4 sticks work without problems (they are not damaged, tested).
  • The Mobo has the latest update (Version 1720).
  • My RAM kits are listed in the memory support list on the Asus website
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4 Replies
Super User

"My RAM kits are listed in the memory support list on the Asus website"

But, they are not supported by your processor:


Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]

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Thanks for your reply.

Oh, it's a surprise for me, I was not aware of that.

What puzzles me is that I have been using 2x32GB RAM with XMP profile @ 5600Mhz for about 2 months now without any problem.

Actually the problem started now that I bought an extra kit of RAM memory to improve the experience in the Adobe store and tried to run the 4 dimms at 5600MHz.

Thanks for your comment.

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But, they are not supported by your processor:

Excuse me friend, I have a question.
If the Intel i9-12900K, which is Intel's newest and top-of-the-range processor, does not support DDR5 RAM above 4800 Mhz.
RAM memories like the Team Group DELTA that run at 6200MHz. Where can they be used? What processor can handle that kind of RAM?

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Valued Contributor I

Memory RAM manufacturers have been outmatching CPUs on what the CPUs' memory controllers can support...

When you see sticks advertised as "6200MHz" it does not necessarily mean it is their "default or basic" speed (aka SPD)... it could be something lower like 4800MHz... and 6200MHz mostly refers to the "highest clock rate tested"... but sometimes you need some additional steps to have them working at that speed (example: using XMP, or manual tweak)...

There are many debates out there saying that there is no point in having such faster RAM sticks, others say there is a benefit because there is a little gain in performance cause RAM at higher speed will reduce memory timings... but you would need to know how to configure them for that, and still, you're risking running out of specifications and may be voiding warranties...


IMHO, I think that memory manufacturers just used this technique of advertising their memories using the "highest tested speed" to sell more expensive kits even though most of the users won't take advantage of it.. they use it to make people think "oh, this RAM is faster, so I maybe get this one"... They may also sell using this technique saying "the RAM will be ready for upgrades in the future to support newer/faster CPUs"...


Now, this depends on how you plan to use this system and how much time will you keep it and invest in maintenance and upgrades...

Planning for future upgrades may be an option for those who only have a single rig... or maybe due to not having enough room for placing several systems, one might think of keep upgrading a system instead of building a new one (and keep the old one)...

I plan with much anticipation when I want to buy or build a new rig... I have several at home for different purposes... I buy the hardware for the type of tasks and for the time I think I will use that system... once it has reached "end of life" for the purpose I got it, I give it away to family or sell it as second hand for anyone interested in giving a second opportunity to an old system (of course, still a working system but just not meeting the specs for what I need it)...


So, the question is, are you willing to risk CPUs and or mobo warranty to tweak with faster RAM to see if you gain performance because of the "memory timing reduction" (even though that is not guaranteed and you really need to know how to configure that) and also spend the extra money for that?... or... do you plan to upgrade your CPU (and almost certainly you'll also need to upgrade your mobo if upgrading CPU) and so, you want to buy now this memory RAM kit that would be still compatible with future upgrades? (and willing to not be able to use this RAM at its maximum for now, however)?

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