Ser5 max 6800u crashes

zorin1

I have been doing some stress testing on my Ser5 Max and it crashes running CineBench R23. What I have observed is when a single core is idle and boosts that it will sometimes crash. The easy way to test is to run CineBench R23 single core run. I would let it create 3 titles and then hit stop and then wait a second and hit start again. I would repeat this process multiple times until it crashed. What I mean by a crash is sometimes it would power off and others it would reboot. I would also jump back and forth between the multi core and single core test, stopping it before it finished and start another run. I noticed that for the multiple core CineBench run if the cores were already busy and the cores did not have to boost up that it would run. I told chatGPT what was going on and I made a bunch of changes to the BIOS until it became stable. After it became stable I was able to go back and figure out which settings are really needed. I would go into the bios and reload the defaults before you make these changes. Also, there is a little hole in the front of the Mini PC that will let you clear the BIOS in case it won’t boot. With the Power on, I would push in a pin into the hole for a seconds or two and the machine would reboot.
Hopefully these settings help someone.

Beelink SER5 Max (Ryzen 7 6800U) — Minimal BIOS Settings for Stable Single/Multi-Core Performance

Bios path: Advanced → AMD CBS → SMU Common Options

System Configuration (TDP): 28 W
- Defines total CPU power limit. Recommended range: 25–28 W for mini-PCs.
TDC Control: Manual
- Limits sustained current per core. Helps prevent CPU from hitting current limits and crashing.
TDC_VDDCR_VDD: 45,000 mA
- Sets core current limit. Recommended range: 40,000–50,000 mA depending on cooling. Too low → throttling, too high → risk of instability.
EDC Control: Manual
- Limits short-term boost current spikes. Critical for stability during single-core boost.
EDC_VDDCR_VDD: 70,000 mA
- Short-term current cap for CPU cores. Recommended range: 65,000–75,000 mA. Too high → possible reboot; too low → unstable boost.
PROCHOT Control: Manual
- Enables thermal/current protection. Keep manual to fine-tune deassertion.
PROCHOT Deassertion Ramp Time: 15
- Controls how quickly the CPU ramps after hitting PROCHOT. Recommended range: 10–20. Smooths boost entry and prevents reboot on repeated start/stop.

Notes:

PPT Control, Fast/Slow PPT Limits, STAPM, SmartShift, Fan, Voltages, Zstates → leave on Auto.
This setup fixes rebooting on single-core boost while keeping multi-core and single-core scores high.
Safe for daily use; temps remain _{75–78 °C} under sustained load.

MikeM

I’ve been experiencing the same issue with this model shutting down or rebooting at random times under a little heavier than normal load, so I appreciate you sharing this. I had Beelink warranty replace the unit due to this problem. The replacement unit works better, it doesn’t shut down nearly as often, but it still shuts down from time to time. I thought I would just have to live with it till a new Bios update comes out, then I read this post. What you have shared makes sense, I hope it resolves the issue. I’ve been running my games on it for a few days now and so far so good. Thank you very much!

ajmxco

Thanks for this. I made this updates in the BIOS and hopefully it’ll solve the random shutdowns.

ajmxco

No random shutdowns since making these changes.

I contacted support and they’re sending a new power supply. Maybe the power supplies shipped with the box aren’t providing enough power and they’re replacing them as folks complain?

Calixoo

This has definitely helped with the issue; the shutdowns are occurring a lot less often. I believe the issue is with the power supply. I will change the power supply with a different one and report back.

Calixoo

Calixoo Happy to report that a new power supply has fixed my issue COMPLETELY. The one that comes included is definitely not up to standard, especially for a 6800U. My 5500U units have not had the shutoff issue, despite using the same PSU.

Thelongdivider

Thank you very much for publishing these. They definitely helped with the issue on my unit.

I agree that it is likely a power supply issue. It appears to be rated for less than 30w, and the SoC itself is 28w. The nvme, wifi, Bluetooth, USB devices, and even transient power spikes can trivially break 30w.

Please report back if a better power cable helps @ajmxco!

ajmxco

Received the new power supply they shipped me on their dime. It’s 19v 5.26A which is more power that the one that came in the box.

Should I keep these BIOS settings or revert to defaults?

Thelongdivider

I have been running these settings for a week with only one shutdown. What a huge improvement.

I think the point of the better cable is to get the full performance of the device (allowing for more boosting behavior). So trying to revert the settings to defaults would be ideal.

It also seems stable given the prior report 😊

ajmxco

With the new power supply and the BIOS settings set to defaults I’m no longer getting the random reboots and shutdowns.

Thelongdivider

Same here. Thanks to beelink for sending me a power supply with twice the amperage. Completely solved my issues ❤️