IN SUMMARY - DO NOT BUY CRUCIAL RAM FOR YOUR RAZER MACHINE
I swapped their horrible customer service and SO-DIMMS for Kingston HyperX Impact 3200mhz, installed it this morning and IMMEDIATELY the machine is running the chips at 3200mhz, the XMP profile even automatically selected itself in BIOS so I didn't need to change a thing.
IN SUMMARY: HYPERX IMPACT CL20 3200MHZ WORKS PERFECTLY IN THE RAZER 17 PRO 2020 in XMP MODE (default profile)
Just to help others, this is the one that I bought: https://amzn.to/33DI9ag
The machine doesn't hang, boots perfectly and I now have 64Gb in my machine!! Just to add as well, there weren't multiple reboot cycles after installing, it just worked immediately.
There are a number of threads on this forum relating to upgrades and it isn't at all clear which have a successful result, and that's why I have posted this as a new topic, to hopefully help those desperately searching for the right RAM updates for their Razer 17 Pro (2020).
Just to also add, I benchmarked the machine stock (16Gb factory RAM), with the Crucial ram and also with the HyperX, here are the results:
But in summary, this benchmark shows the Crucial ram to be running at far lesser performance than the HyperX.