Well, to be honest, that USB-PD to HP Slim-barrel adapter is...not officially sanctioned, so if it works, great. If not, no big deal.@WANg it seems to be rated for 2400 ram but you’ve tested it with 2600 - any noticeable issues?
Have you tried stress testing the ram in the system?
I’m curious if 64GB of 2600 is contributing to the unexpected power downs...even a couple watts more than rated is nearly 10% of the total power draw...
As soon as I switched it back to the official brick the issue went away. To be honest, even on the 96w Apple PD-brick it was showing signs of throttling (performance seemed "off").
As for stress testing the RAM - the RAM is known good because it was stressed tested already for at least 6 hours in the past on my t740. I actually felt more brave testing it on the t740 since it’s an actively cooled machine (with a blower), while the 640 depends on its passive heatpipe/heatsink setup. That being said, 2666 seems fine - I am not even sure if that DDR4-2400 specification was due to it being a hard limit, or the most economical RAM available for validation during the product announcement in 2018, and the same goes for the "32GB max" on the official documents. It's still fundamentally a Raven Ridge and is most similar in specs to a Ryzen 3 2200U/3200U, and those APUs can accept faster RAM. The machine is shipped by default from HP with DDR4-3200 memory, so I am sure it is fine.
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