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Cyran said:

For all the people planning on getting 5000 series Ryzen a interesting video on how memory configuration is affecting performance and not in the typical timing/frequency way but how many Dims are used.

The testing in this video focus on 2x8 vs 4x8 single ranked.  I think more testing need to be done for higher memory modules and single vs dual rank memory to get a full picture but it a good first look especially if you planning on 8gb modules it might be worth the cost to get 4 instead of 2. For 16gb and 32gb I would like to see some testing reviews on.

*video*

Thanks for sharing. Looks like things haven't changed much since Zen2, where dual vs quad memory modules also played a role in the performance of the system. But maybe this time it's even more important, as those differences are huge, almost as much as what you could get from overclocking the CPU itself.

vivster said:
Already knew that from their previous testing of RAM. That's why I don't feel bad for paying a high premium for 4x8GB 3600 CL14 RAM. Now I just need to see a test that confirms that 3600 is just as good as 3800.

While Zen3 sussports up to 4000MHz kits, I doubt you'll be able to find a better kit than the one you've already selected. 3600 CL14 is better than 3800 CL16. It was for Zen2 and I'm sure it will be again for Zen3. 

Captain_Yuri said:
So some people have been able to get 5000 series working on X370. It's a rumour for now but maybe someone will put out a custom bios to make it work if AIBs don't.https://wccftech.com/amd-ryzen-5000-zen-3-desktop-cpus-running-on-a320-x370-motherboards-b450-support-added/

There's always someone trying to achieve what can't be done.

In any case, even if there's a custom or een official BIOS that allows that, I would be wary and don't go for anything higher than an 8-core processor. Those boards weren't designed for more than that and the power delivery system may not be up to the task.