MSI MAG Tomahawk WiFi stuck on reboot with EXPO enabled.

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JonYo

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Hello, I've recently run into an issue with my PC that I had had for about a year. I have had zero issues with this build until about 2 weeks ago.

All of a sudden when I go to reboot, the system shuts down and the yellow DRAM indicator on the mobo lights up and the system will not boot back up. If I hold down the power button and do a fresh restart it comes back on. Since I assumed it might be a DRAM issue according to the debug light I ordered a replacement kit of ram. I installed it this morning and I am having the same issue.

I have done all Windows updates. I have updated my BIOS and AMD chipset. My graphic drivers are up to date. I have tried enabling memory context restore and disabling fast boot in Windows settings. I am at a bit of a loss here. Any help would be appreciated.

Specs:
Ryzen 7800x3D running at stock settings
Deepcool Assassin IV
G SKILL Trident Neo 64GB DDR5 6000 cl30
MSI B650 Tomahawk WiFi with latest BIOS
EVGA 3080 FTW3 Ultra
Corsair RM850x PSU
Windows 11 with most recent updates applied
 
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Could you use "Memory Try It!" in BIOS Overclocking-DRAM Setting with different memory speed, latency setting to check whether the system stability could be improved when memory overclocking.
 
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Shot in the dark, but did you by chance update to the 576.02 NVIDIA drivers from several weeks ago?
I think they may have been the impetus for my issues.. that I'm just getting around to digging into again.
 
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smokee said:
Shot in the dark, but did you by chance update to the 576.02 NVIDIA drivers from several weeks ago?
I think they may have been the impetus for my issues.. that I'm just getting around to digging into again.
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I do have the most recent Nvidia drivers. I was wondering if this could have been triggered by some kind of compatibility issue with an update since it just started seemingly out of nowhere.
 
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Try reducing the RAM frequency from 6000 Mhz to 5600 Mhz in Bios. Also check CPU NB/Soc Voltage in Bios, it should be between 1.2v - 1.25v when EXPO is enabled, if it is higher than that, manually set it to 1.2v.
 
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fewele310161602ee said:
Try reducing the RAM frequency from 6000 Mhz to 5600 Mhz in Bios. Also check CPU NB/Soc Voltage in Bios, it should be between 1.2v - 1.25v when EXPO is enabled, if it is higher than that, manually set it to 1.2v.
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Wow I think this worked! It was over 1.3 when I checked. Lowered it to 1.2 and have restarted a couple of times no problem. No idea how this issue popped up out of nowhere over a year into having this PC but whatever lol
 
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Likely PC was operating at 1.3 Soc voltage for a year until it degraded CPU slightly and you started having reboot issue with EXPO enabled.

MSI Bios developers need to put Max Limit of 1.25v Soc Voltage even if AMD is allowing 1.3v Soc Voltage in AGESA.
Also MSI should put Max limit of 1.35v to CPU Core Voltage for 9000 series and 1.4v for 7000 series even if AMD is allowing Programmed VID Limit 1.4v for 9000 series and 1.45v or higher for 7000 series.
CPU VDDIO also need max limit of 1.4v so when EXPO is enabled and if EXPO voltage of RAM is 1.45v or 1.5v, it wont set VDDIO to that voltage and potentially damage CPU.

This should put an end to CPU degradation, crashing CPUs and dead CPU problems once and for all.
 
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JonYo said:
Wow I think this worked! It was over 1.3 when I checked. Lowered it to 1.2 and have restarted a couple of times no problem. No idea how this issue popped up out of nowhere over a year into having this PC but whatever lol
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Did you just lower the soc voltage or did you also lower the RAM frequency? Asking because I'm having issue with this board/something. My Soc Voltage is at 1.2 in bios.
 
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smokee said:
Did you just lower the soc voltage or did you also lower the RAM frequency? Asking because I'm having issue with this board/something. My Soc Voltage is at 1.2 in bios.
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Maybe the CPU IMC degraded slightly due to CPU VDDIO Voltage and not 100% stable anymore at higher voltages or frequency.
Try lowering the DRAM Voltage, DRAM VDDQ and CPU VDDIO Voltage by 500 millivolts. If it is around 1.4v with EXPO On, lower it to 1.35v for example.
If you set the RAM frequency to 5600 Mhz, you could be able to lower the voltages to 1.3v or 1.25v possibly.
 
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I think CPU VDDIO Voltage which the Integrated Memory Controller Voltage is also set too high 1.35v-1.45v or higher depending on EXPO Voltage. I think EXPO Profiles or AGESA should be optimized/tuned to work with 1.2v CPU VDDIO Voltage otherwise Memory Controller inside the CPU would degrade faster due to higher voltages and CPU IMC would last only 4 or 6 years at best instead of 8 or 10+ years.
 
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