Well, its been a while since I updated my testing of the 1UP. I had some fairly major surgery that put a damper on things. I have used the 1UP as a daily driver when needed. For me it works great, light weight, and capable enough for daily needs.
You do have to remember that while the CM5 appears to have the logic on board for suspect (I think I read that somewhere) it is not exposed. This means your 1UP will not sleep when you close the cover.
Some modifications to /boot/firmware/config:
#
# Make the fan run faster and earlier
#
dtparam=fan_temp0=45000
dtparam=fan_temp0_speed=125
dtparam=fan_temp1=50000
dtparam=fan_temp1_speed=175
dtparam=fan_temp2=55000
dtparam=fan_temp2_speed=225
dtparam=fan_temp3=60000
dtparam=fan_temp3_speed=250
#
# Overclock a little... not sure how far we can push this
#
arm_freq=2800
The first part runs the fan a little more than the default setting for a CM5, and the last bit over-clocks to 2.8GHz. I was thinking about pushing it a little more, but as it is now the system is snappy and reliable.
I am quite happy with Raspberry PI OS on the system. I seriously dislike Ubuntu, more so on Raspberry PI’s as the boot time is glacial for everything I’ve used.