I think it's worth investigating the level of "support" these boards offer for ECC. The ASRock Taichi for example does not have any ECC DIMMs in its "qualified" list.
Interesting. Might be good for someone (not me!) to investigate then write in-depth info about. :)
As a data point, I'm using a previous generation ASRock AM4 motherboard with ECC and that definitely works.
I'm undervolting my cpu and ram, and very occasionally (every 6 months or so?) one of those seems to be generating a correctable ECC error that gets propagated to warning messages on my terminal. Haven't bothered investigating any further though. ;)
The laptops with ECC memory are expensive and they are available for now only with Intel CPUs (while it should be possible to use mobile AMD CPUs I have never seen any such product). They are sold as "mobile workstations" by Dell, Lenovo and HP. I have a Dell Precision mobile workstation laptop with ECC memory bought in 2016 and it still works fine. However I had to pay for it EUR 3000 in 2016 and now something similar would be even more expensive (it had an NVIDIA Quadro GPU and 32 GB of ECC memory).
For desktops it is much easier to choose ECC memory, because the additional cost (the cost of the memory modules is 50% higher for DDR5-4800) remains a small fraction of the cost of an entire computer.
What is needed is to buy a motherboard with ECC support.
An example of a good motherboard with ECC support is ASUS PRIME X670E-PRO WIFI (for AMD Ryzen). I have been using a similar ASUS motherboard with ECC memory from the previous X570 generation for the last 5 years and it still works fine.
There are several other such MBs, mainly at ASUS and ASRock.
For Intel Raptor Lake there are fewer and more expensive such motherboards, but they can be found at ASUS (Pro WS W680M-ACE SE) and at Supermicro, as "workstation motherboards".
