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New Asus ROG Crosshair X670E Hero motherboard memory issues

Level 8

I just built a new PC, to complement my Mini ITX PC I have been using.

New PC:

Asus ROG Crosshair X670E Hero running lates BIOS 2007

AMD 7950X cooled by Arctic Freezer III 420 AIO

RAM: 2 X 32GB G.Skill Trident Z5 NEO RGB 64GB DDR5 6000MHz AMD EXPO (F5-6000J3040G32GX2-TZ5NR)

NVME: Crucial T500 2TB PCIe Gen4

Asus RTX 4090 ROG STRIX OC Edition

Be Quiet Straight Power Platinum 1500W

Lian Li Dynamic Evo XL

My miniITX build has the ROG B650E ITX motherboard + 7900X CPU + Asus 4070 Dual Super in Coolermaster N200P Max case and PSU. The RAM is the same exact kit: 2 X 32GB G.Skill Trident Z5 NEO RGB 64GB DDR5 6000MHz AMD EXPO (F5-6000J3040G32GX2-TZ5NR)

With my new PC, it will not stay stable with EXPO enabled.

I have swapped the RAM sticks between my PC and MiniITX PC, and the RAM will happily run at EXPO 6000MT/s in my MiniITX, but will not run on my main PC

Description of the issues:

1- When enabling EXPO 1, system boots, goes through memory training, CODE 15 shows up. After about a minute, system boots fine, and 6000MT/s shows up in task manager. Everything works well, except with any sleep/restart/cold restrat/shut off and then turn on the system will not start up again.

Codes displayed:



I then need to force a shut down with a long press of the power button, which takes me into the BIOS setup page, and press F1

Sometimes it will not, and I need to clear CMOS.

I have tried every possible thing I could find on the internet, but it will simply not run stable or restart normally unless EXPO is disabled and RAM is at 4800MT/s

I tried EXPOII, Tried the MCLK=UCLK, tried disable power down, tried disable memory context thing, etc..NOTHING WORKED

My miniITX runs the SAME PHYSICAL ram kit at 6000MT/s with PBO enabled on the 7900X in a miniITX chasis with a 750W PSU with no trouble at all?

On the main PC I just cannot tweak anything at all. Its either 4800MT/s or NOTHING works normally and I get all sorts of post Q Code errors.

Important thing to note though, I NEVER GET BSOD 

The main issue is with START UP of the PC at 6000MT/s.

The PC would also randomly restart at 6000MT/s with no warnings.

Please help and advise.


Level 8


Are there any moderators here that can help please?

Did you try updating your Bios?
Have you tried installing the 7950X in your Mini ITX to see if the issue lies with the CPU's memory controller? This way, you can determine which controller is at fault, whether it’s the motherboard or the processor. The 6000 MHz EXPO may not necessarily work. For some, XMP works better than EXPO on certain motherboards. If the issue is with the motherboard, you might need an expert to help you input manual settings. I had a similar issue with a Gigabyte motherboard where 6000 MHz was not stable.


thnx for your reply

as mentioned in the first couple of sentences of my post, I’m running BIOS 2007, which is the latest available BIOS. 

I’m worried about removing the 7900x from my mini itx PC, as it’s running rock solid, and I’m now getting most of my work done on it. 

I was hoping that the new X670E build will be my main rig, as it has the 4090 that would be helpful with my media encoding and other work related matters, but it’s just not stable. 

I already wasted so much time swapping memory between the 2 PCs, trying a different power supply, trying so many BIOS settings, following some YouTubers guides, that I’m a bit fed up with troubleshooting the main PC…

Gunny thing is: It boots fine into EXPO1, and will run perfectly fine, will benchmark fine, AIDA64 stable, CINEBENCH23 stable, all 3DMARK benchmarks are stable, everything runs ok, until I restart or turn it off and back on. 

It NEVER restarts. It power cycles and goes to error code 46 or O1. 

So I need to force shut it off, and then I go through the F1 cycle again. 

I’m struggling to believe it’s simply a memory problem? If it was, the PC should have issues with running benchmarks, memtest86, AIDA64 memory stress test etc while in windows?

Surely if 6000MT/s was an issue, I should get BSODs or random restarts?

Yeah, I noticed it’s in 2 places in the BIOS. 

BTW, I finished building this PC about 1 week ago. 

I’ve spent more time in the BIOS than in windows!!!!

Are you saying to DISABLE or ENABLE the option?  

My understanding is that disabling it forces memory training with every boot, which is advisable when things are unstable?

And yeah, I think when I enabled it in AI weaker, I got an instant BSOD. that was my only BSOD. 

I think ENABLE POWER DOWN goes hand in hand with MCR?

Not sure. 

Customer Service Agent

Hello, @odessouky 

May I ask if your memory modules are currently installed in DIMM_A2 and DIMM_B2?
If you install a single module in DIMM_A2 and enable EXPO I, does the issue you described still occur?

Does the issue of being unable to reboot after shutting down also occur in the default BIOS settings after clearing CMOS?

Thank you.

Due to the ongoing regional holidays, my responses may be slightly delayed.
Thank you in advance for your patience.‌‌‌‌ 🙂


Yes, memory modules are installed in the PRIMARY slots: A2 & B2

I tried each of the 32GB sticks on its own, once in slot A2 and once in B2. 

Memory module A once in A2 and once in B2

Memory module B Once in A2 and once in B2

Ran EXPO 1 and Everything was normal and I could restart as much as I would like. No issue. 

Ran AIDA64 extreme memory benchmark and results were around the 45,000MB/s and latency 70ns. 

Cold and hot reboots were all fine. 

When I then installed BOTH ram modules, it boots fine, but I get random glitches on the monitor, and AIDA64 memory benchmark shows strange results: 

Sometimes 85,000mb/s and sometimes 140GB/s and latency 90ns

Reboot occurred fine ONCE, but a repeat reboot led to error code 46. 

I have already ran MEMTEST68 overnight, as well as Windows memory diagnostics, as well as KARHU me test for 8 hours. 

I got ZERO memory errors when running EXPO at 6000MT/s and no BSODs or shutdowns. 

the PC is more or less running fine with no errors, just the very occasional screen/monitor glitches


Lastly, when I clear CMOS back to 4800MT/s, there are ZERO issues and everything works normally. 

Many thanks. 


Running stock now is also an issue. 

Please help. I do not know what further I can do. 

I no longer want to run EXPO. 

I just want a stable PC at stock default 4800mt/s settings!!

Customer Service Agent

Hello, @odessouky 

We apologize for any inconvenience caused by the delayed response.
Could you please confirm if you are still experiencing BSOD or automatic shutdown issues after clearing CMOS and using the default BIOS settings?
If so, could you provide details on the frequency (e.g., once a day, twice an hour), the circumstances (e.g., automatic shutdown occurs when running two specific games), and a complete video recording of the issue?
Based on your description, this appears to be a frequent problem.
Kindly follow these steps to provide a related video: 
Start recording> Clear CMOS, boot with the default BIOS settings, and enter the system> Use the system normally, showing CPU, GPU, and system temperatures> Capture the occurrence of BSOD or automatic shutdown, including the PC’s state (e.g., RGB lights, fan operation)> Demonstrate your troubleshooting steps and results> End the recording
This will help us better understand your configuration and the issue, and we will consult the relevant members.

Thank you.

Due to the ongoing regional holidays, my responses may be slightly delayed.
Thank you in advance for your patience.‌‌‌‌ 🙂