4 sticks now better than 2? R5 5600X Tested
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Towards the end of the video he suggested that Wendel from Level 1 Techs found that 4x8GB Single Rank performed well, but 2x16GB Single rank performed better. Potentially a typo on the script? I need clarification on this before I purchase memory for my 5900X.
Possibly a mistake, but a very half-assed vid imo, should've taken time to do it properly with the 16GB kits, feels rushed for the sake of content and just creates more uncertainty.
Honestly I don't blame them, its been a busy week for Steve and the GN crew. I'll give them this one since they rarely make these kind of mistakes.
Mistake or not I'm glad it came up as it's made me check and I've found my Crucial sticks are actually 2 x 16gb single rank. I wasn't aware of this before although I may need to send them back and get something else if 2 single rank dimms aren't performing well on the 5 series.
Or can you just add 2 more down the line for 4 x single rank ?
I recently got 2x16 ballistix single rank but too late to send back.
Still have 2x8GB team group also rated at cl16 3600 and single rank I believe. Maybe could try and throw it all together for 48GB 4x single rank?!
4 single rank sticks, or 2 dual rank sticks are also fine. I wonder, he is not aware of memory ranks, memory interleaving... He should have watched more Buildzoid on Youtube... 
So final word, it is not about the number of the modules, it is about the number of the ranks.
So final word, it is not about the number of the modules, it is about the number of the ranks.
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He may refers to 2x16GB dual rank kit, as a sweet spot. By the way, it would be, due not all of the mobos will like the 4 modules.
Get someone to go again starting with good and consistent speed and timing for all modules then do:
2x8 SR
2x8 DR
4x8 SR
4x8 DR
2x16 SR
2x16 DR
4x16 SR
4x16 DR
It's the only way
Forget the 4 DR modules. Consumer CPUs cannot handle more than 4 ranks.
Fair, I just hope there is a follow-up to confirm the findings as I just ordered memory and will swap it if there is a real benefit. Most places are sold out so we unfortunately aren't spoiled for choice at the moment.
4 single rank sticks, or 2 dual rank sticks are also fine. I wonder, he is not aware of memory ranks, memory interleaving... He should have watched more Buildzoid on Youtube...
Yea, so if you want 32GB of memory, either 4 single rank sticks, or 2 dual rank sticks.
Caporegime
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Seen plenty of people managing 4xDR on X570, I havent had great results personally but would love to know how Zen 3 does with 4xDR.
It is quite pointless to use the setup. There are no advantage to use more than 4 ranks, and if you are lucky enough the CPU/mobo combo can handle it, the frequency and the latency will be terrible at the end, so you are loosing performance. Just check Buildzoid "Rambling about DDR4 memory channels and ranks" vid.
ranks video, he describe it well.
Caporegime
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If you need 64GB of RAM up until recently you didn't have a choice.
The results seem more variable than you suggest. Seen plenty of people running 4x16GB DR at 3600mhz at decent timings on X570.
I've managed to get 3600mhz running all 4x16gb modules but my board is flakey with 4 modules so i just run 2 currently.
3600MHz is not 4000. And as I saw, and I expect from my CPU, there will be 4000MHz+ memory speed achievable. But you always have a choice, as if you need 64GB, there is a Crucial Ballistix 2x16GB 3600C16 kit with Micron E die ICs, and those are single rank modules, and the same IC's which are coming on the MAX series, which are capable over 5000MHz memory speed. So you can buy two of those, and sorted, 4000-4133MHz CL14 is guaranteed. Or with the same ICs, G.Skill has Ripways kit, 2x32GB 4000C18 dual rank. Corsair also has.
With Samsung B-Die, I would not recommend the 2x 2x16GB kit. It cost a fortune, and as I said, the performance drop is huge. ZEN, especially ZEN 3 is very hungry for memory bandwidth.
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I don't disagree that 4x16GB B-die isn't ideal but the statement was "forget the 4 DR modules. Consumer CPUs cannot handle more than 4 ranks." which isn't true and I can't be the only person with that setup that wants to see the results.
If Zen 3 can run 3600 or higher with 4 DR rank modules then the performance drop is unlikely to be huge either, you're talking low single figure percentage as a worst case.