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Delving into this in more detail, the AtoD conversion doesn't look very stable.
My digital voltmeter reads on a nominal mid position of XY feed pot a steady, non varying 1.666v
the 7i73 analog0 numbers flicker, not regularly, like on a timer, but with a fast random up and down.. With a slow-mo video
I actually get readings 1.565882,1.578824, 1.591756 the differences are exactly one bit. (3.3volts, 255 bits, ie 0.012941 volts per bit)
When the servos are on, then this flicker is actually audible.
Can you suggest anything that I can do to improve this please?
Thanks

i make another test this time with raspberry pi4 (4gb)
 

I have some Sunix PCI-E cards that work properly.
forum.linuxcnc.org/18-computer/54368-pci...ut-of-the-box#313942

To normal people, those numbers seem very far fetched as there is no pricing info for anything like that.
As Americans say: if you have to ask for the price, you can not afford it.
And when you do ask, be sitting with a glass of cold water in hand and 911 on speed dial.
Only when you have invoices in hand for such stuff, you start believing (coupled with the headache it induces)
See if you can find pricing for commercial license 5 axis CAM and report back here, if you can!

We (mods and admins) get e-mail notifications for every post, always, so from 50 to over 100 daily.

I think that you should enable HPC (High Performance Computing) to prevent it from lowering the cpu frequency. Possibly also core performance boost. And to see if the kernel parameter works: cat /sys/devices/system/cpu/smt/active