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MAXIMUS Z790 Hero and G.Skill Trident Z5 RGB DDR5-6000

Level 8

Good evening everyone, I recently built a new system which the specs are below. The problem I am having is I can not turn on XMP, XMP I or XMP II as the system hangs at Q-Code 55. Therefore, I can't run my memory which is rated for 6000 mhz at it rated speed. All I can do is set the bios to optimize in the EZ setting and then set the DRAM frequency to 5200mhz. This is the only stable setting I can find. Has anyone else run into this problem? I have full 128gb of RAM installed.

Motherboard: ROG MAXIMUS Z790 HERO (Bios 2002)
CPU: Intel Core i9-14900K Raptor Lake
Memory: G.Skill Trident Z5 DDR5-6000 4x32GB (F5-6000J3040G23GX2-TZ5RK) 
Storage: Crucial T500 2TB TLC NAND PCIe Gen 4 x4 NVMe M.2 Internal SSD
Bios: 2102
Windows 11 Pro 64-bit



I have the *exact* same issue with almost the same setup (except I'm running a Z790 Formula, 4080 Super and Samsung 990 drives).

4 DIMMS set perfectly (and reset multiple times).  It boots fine with a CMOS reset.  I turn "ASUS MultiCore Enhancement" to "Disabled - Enforce All limits" and that is pretty much all I can do.  If I try XMP1, XMP2 or set the memory to DDR5-6000 (or anything really) it just recycles "Detect Memory" with Code 55.

At CMOS reset settings it's telling me my DDR5-6000 ram is running at 3600MHz.  This stinks.

Motherboard: ROG MAXIMUS Z790 FORMULA (Bios 1102)
CPU: Intel Core i9-14900K Raptor Lake
GPU: ASUS TUF Gaming NVIDIA GeForce RTX 4080 SUPER Overclock 16GB GDDR6
Memory: G.Skill Trident Z5 DDR5-6000 4x32GB (F5-6000J3040G23GX2-TZ5RW) 
Storage: Samsung 990 PRO 2TB PCIe Gen4. X4 NVMe 2.0c - M.2 Internal SSD
Bios: 2102
Windows 11 Pro 64-bit



those are 2 kits. not a kit of 4.  you can not mix ram even that are the same they are not validated to work together.

Learn, Play Enjoy!

Thank you for such a quick reply!

Now that I read it, it makes sense but it sucks.  So there is no way to get 128GB of ram other than buying Kingston (/shudder due to past experiences).

So is my only recourse to take 2 sticks out and return them or are there any kind of settings I can do to try and get these to actually be stable?  It has been years since I have overclocked anything...  I honestly cannot remember timings etc.

check the motherboard website and check the qvl models. Make sure you select 14th intel on the sort


Event that bios are getting better there is the other side of what is known since day one. I get pound time to time on this but still hold updodate! and yes i have see kits of 4stick working fine.  and also see 2 kits and get lucky. (and luck is not a factor to spend if works or not. is IC on ram with board and cpu. as i say if works works if not is not. I did help a user to mix it but you need to lower the speed until post and run some test. and most is basic or lower. the best i have see is 5800mhz but another did drop up to 3000mhz and was not even close stable but did post.



Learn, Play Enjoy!

I took both kits and took out all sticks except one and I still couldn't turn on XMP. I tried it with two sticks from the same kit and still unable to turn on any XMP profiles. They get stuck at the Q-Code 55. So I believe something else is going on. I can have all four sticks installed and just up the DRAM frequency to 5200 and the system boots and is stable. I believe that something else has to be happening to not allow me to turn on XMP profiles.

When trying with one stick, did you have it installed in the A2 slot (2nd slot from the cpu)?

From the motherboard manual, here are the recommended memory configurations for 1 stick, 2 sticks and 4 sticks.

z790 hero dimm config.png



Level 8

Thanks but I also built this machine with aesthetics in mind.  Are there any helpful "plug in your stuff and here are your timings, voltages, etc" sites or tools that might allow me to manually set this to where it's stable?



I didn't catch that, but as MrAgapiGC points out, you don't want to combine memory kits. Since your combining memory kits you will most likely have to settle for a lower frequency, you can set the Dram Frequency on the Extreme Tweaker page as shown in your screenshot.

You can tune the frequency, timings and voltages in the bios.

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

1) Dram VDD voltage

2) Dram VDDQ voltage

3) CPU System Agent voltage

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

4) IVR Transmitter VDDQ voltage

5) Memory Controller voltage

Dram Timing Control - Takes you to the memory timings page.