Sonnet 650 vs sonnet 550? Are there more differences than just the PSU?
After 48 hours of deliberations, they came back to me saying they had found the reason: I was using the 550 Watt version when their recommended setup is with he 650 W version, as set forth in their website:
Evidently, they were looking for a reason not to continue looking. This is a French support team and that is how things work, customer service is not too much embedded in French culture. I have had issues with non-french products in France and only managed to get support when contacting their homebase directly (iRobot and Brabantia).
Evidently this is BS since it is clear that it is not necessary so much power, it is oversized even when considering the 85 W needed for MacBook charging, that I do not need. It is clearly written on the Sonnet website compatibility chart. The RX 5700 needs only the Sonnet Breakaway 350, and there is only a difference of 80 W or so.
Any thoughts? Is it worth the while to even try to upgrade the PSU ? Can I contact Apple US directly somehow ?
Yes, you can chat with them on the apple support app on an iPhone. It should work the same with either PSU, this is an excuse.
I changed the TB3 cable on Sonnet's support suggestion and it worked. The Plugable Technologies cable I had bought on amazon.fr had worked for some days but stopped doing so.