My Ryzen 3900X supports it fine, ASUS Prime Pro 370 and 570 boards.
Using 64 gigs of this: https://media.kingston.com/pcn/PCN_KSM26ED8_16ME_C1.pdf
Using 64 gigs of this: https://media.kingston.com/pcn/PCN_KSM26ED8_16ME_C1.pdf
Given that was one of the requirements of the OP (integrated graphics), my point even though technically imprecise, still stands.
I have the same memory sticks. They cost £157.86 each 32Gb stick. That's over 2x the price of non-ECC sticks of otherwise similar specs.
Sounds like money well spent.
I wasn't making any value judgements though, only posting observations.
That said, it's much more likely that a faulty or low quality PSU will be the cause of that rather than the cable, and there's a lot already written out there about why a high quality PSU is important.
I replaced 2 of the 16GB ECC sticks in my main PC with 32GB ones a while ago and put them in my NAS, will probably do the same with the remaining 2 sticks to max out my RAM.
This shop [0] sells the same ones I have but it's even more expensive than it was last year, at £206.17 for 32Gb.
[0] https://harddiskdirect.co.uk/ksm26ed8-16me-kingston-technolo...